751 lines
26 KiB
Tcl
751 lines
26 KiB
Tcl
# Run this TCL script using "testfixture" in order get a report that shows
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# how much disk space is used by a particular data to actually store data
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# versus how much space is unused.
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#
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if {[catch {
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# Get the name of the database to analyze
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#
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proc usage {} {
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set argv0 [file rootname [file tail [info nameofexecutable]]]
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puts stderr "Usage: $argv0 database-name"
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exit 1
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}
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set file_to_analyze {}
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set flags(-pageinfo) 0
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set flags(-stats) 0
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append argv {}
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foreach arg $argv {
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if {[regexp {^-+pageinfo$} $arg]} {
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set flags(-pageinfo) 1
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} elseif {[regexp {^-+stats$} $arg]} {
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set flags(-stats) 1
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} elseif {[regexp {^-} $arg]} {
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puts stderr "Unknown option: $arg"
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usage
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} elseif {$file_to_analyze!=""} {
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usage
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} else {
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set file_to_analyze $arg
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}
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}
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if {$file_to_analyze==""} usage
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set root_filename $file_to_analyze
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regexp {^file:(//)?([^?]*)} $file_to_analyze all x1 root_filename
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if {![file exists $root_filename]} {
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puts stderr "No such file: $root_filename"
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exit 1
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}
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if {![file readable $root_filename]} {
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puts stderr "File is not readable: $root_filename"
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exit 1
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}
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set true_file_size [file size $root_filename]
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if {$true_file_size<512} {
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puts stderr "Empty or malformed database: $root_filename"
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exit 1
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}
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# Compute the total file size assuming test_multiplexor is being used.
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# Assume that SQLITE_ENABLE_8_3_NAMES might be enabled
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#
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set extension [file extension $root_filename]
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set pattern $root_filename
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append pattern {[0-3][0-9][0-9]}
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foreach f [glob -nocomplain $pattern] {
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incr true_file_size [file size $f]
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set extension {}
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}
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if {[string length $extension]>=2 && [string length $extension]<=4} {
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set pattern [file rootname $root_filename]
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append pattern {.[0-3][0-9][0-9]}
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foreach f [glob -nocomplain $pattern] {
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incr true_file_size [file size $f]
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}
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}
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# Open the database
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#
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if {[catch {sqlite3 db $file_to_analyze -uri 1} msg]} {
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puts stderr "error trying to open $file_to_analyze: $msg"
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exit 1
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}
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register_dbstat_vtab db
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db eval {SELECT count(*) FROM sqlite_master}
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set pageSize [expr {wide([db one {PRAGMA page_size}])}]
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if {$flags(-pageinfo)} {
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db eval {CREATE VIRTUAL TABLE temp.stat USING dbstat}
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db eval {SELECT name, path, pageno FROM temp.stat ORDER BY pageno} {
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puts "$pageno $name $path"
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}
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exit 0
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}
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if {$flags(-stats)} {
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db eval {CREATE VIRTUAL TABLE temp.stat USING dbstat}
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puts "BEGIN;"
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puts "CREATE TABLE stats("
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puts " name STRING, /* Name of table or index */"
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puts " path INTEGER, /* Path to page from root */"
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puts " pageno INTEGER, /* Page number */"
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puts " pagetype STRING, /* 'internal', 'leaf' or 'overflow' */"
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puts " ncell INTEGER, /* Cells on page (0 for overflow) */"
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puts " payload INTEGER, /* Bytes of payload on this page */"
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puts " unused INTEGER, /* Bytes of unused space on this page */"
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puts " mx_payload INTEGER, /* Largest payload size of all cells */"
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puts " pgoffset INTEGER, /* Offset of page in file */"
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puts " pgsize INTEGER /* Size of the page */"
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puts ");"
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db eval {SELECT quote(name) || ',' ||
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quote(path) || ',' ||
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quote(pageno) || ',' ||
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quote(pagetype) || ',' ||
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quote(ncell) || ',' ||
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quote(payload) || ',' ||
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quote(unused) || ',' ||
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quote(mx_payload) || ',' ||
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quote(pgoffset) || ',' ||
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quote(pgsize) AS x FROM stat} {
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puts "INSERT INTO stats VALUES($x);"
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}
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puts "COMMIT;"
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exit 0
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}
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# In-memory database for collecting statistics. This script loops through
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# the tables and indices in the database being analyzed, adding a row for each
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# to an in-memory database (for which the schema is shown below). It then
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# queries the in-memory db to produce the space-analysis report.
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#
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sqlite3 mem :memory:
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set tabledef {CREATE TABLE space_used(
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name clob, -- Name of a table or index in the database file
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tblname clob, -- Name of associated table
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is_index boolean, -- TRUE if it is an index, false for a table
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nentry int, -- Number of entries in the BTree
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leaf_entries int, -- Number of leaf entries
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payload int, -- Total amount of data stored in this table or index
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ovfl_payload int, -- Total amount of data stored on overflow pages
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ovfl_cnt int, -- Number of entries that use overflow
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mx_payload int, -- Maximum payload size
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int_pages int, -- Number of interior pages used
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leaf_pages int, -- Number of leaf pages used
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ovfl_pages int, -- Number of overflow pages used
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int_unused int, -- Number of unused bytes on interior pages
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leaf_unused int, -- Number of unused bytes on primary pages
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ovfl_unused int, -- Number of unused bytes on overflow pages
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gap_cnt int, -- Number of gaps in the page layout
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compressed_size int -- Total bytes stored on disk
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);}
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mem eval $tabledef
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# Create a temporary "dbstat" virtual table.
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#
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db eval {CREATE VIRTUAL TABLE temp.stat USING dbstat}
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db eval {CREATE TEMP TABLE dbstat AS SELECT * FROM temp.stat
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ORDER BY name, path}
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db eval {DROP TABLE temp.stat}
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proc isleaf {pagetype is_index} {
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return [expr {$pagetype == "leaf" || ($pagetype == "internal" && $is_index)}]
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}
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proc isoverflow {pagetype is_index} {
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return [expr {$pagetype == "overflow"}]
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}
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proc isinternal {pagetype is_index} {
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return [expr {$pagetype == "internal" && $is_index==0}]
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}
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db func isleaf isleaf
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db func isinternal isinternal
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db func isoverflow isoverflow
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set isCompressed 0
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set compressOverhead 0
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set sql { SELECT name, tbl_name FROM sqlite_master WHERE rootpage>0 }
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foreach {name tblname} [concat sqlite_master sqlite_master [db eval $sql]] {
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set is_index [expr {$name!=$tblname}]
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db eval {
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SELECT
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sum(ncell) AS nentry,
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sum(isleaf(pagetype, $is_index) * ncell) AS leaf_entries,
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sum(payload) AS payload,
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sum(isoverflow(pagetype, $is_index) * payload) AS ovfl_payload,
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sum(path LIKE '%+000000') AS ovfl_cnt,
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max(mx_payload) AS mx_payload,
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sum(isinternal(pagetype, $is_index)) AS int_pages,
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sum(isleaf(pagetype, $is_index)) AS leaf_pages,
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sum(isoverflow(pagetype, $is_index)) AS ovfl_pages,
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sum(isinternal(pagetype, $is_index) * unused) AS int_unused,
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sum(isleaf(pagetype, $is_index) * unused) AS leaf_unused,
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sum(isoverflow(pagetype, $is_index) * unused) AS ovfl_unused,
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sum(pgsize) AS compressed_size
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FROM temp.dbstat WHERE name = $name
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} break
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set total_pages [expr {$leaf_pages+$int_pages+$ovfl_pages}]
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set storage [expr {$total_pages*$pageSize}]
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if {!$isCompressed && $storage>$compressed_size} {
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set isCompressed 1
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set compressOverhead 14
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}
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# Column 'gap_cnt' is set to the number of non-contiguous entries in the
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# list of pages visited if the b-tree structure is traversed in a top-down
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# fashion (each node visited before its child-tree is passed). Any overflow
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# chains present are traversed from start to finish before any child-tree
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# is.
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#
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set gap_cnt 0
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set pglist [db eval {
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SELECT pageno FROM temp.dbstat WHERE name = $name ORDER BY rowid
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}]
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set prev [lindex $pglist 0]
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foreach pgno [lrange $pglist 1 end] {
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if {$pgno != $prev+1} {incr gap_cnt}
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set prev $pgno
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}
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mem eval {
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INSERT INTO space_used VALUES(
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$name,
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$tblname,
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$is_index,
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$nentry,
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$leaf_entries,
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$payload,
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$ovfl_payload,
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$ovfl_cnt,
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$mx_payload,
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$int_pages,
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$leaf_pages,
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$ovfl_pages,
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$int_unused,
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$leaf_unused,
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$ovfl_unused,
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$gap_cnt,
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$compressed_size
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);
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}
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}
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proc integerify {real} {
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if {[string is double -strict $real]} {
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return [expr {wide($real)}]
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} else {
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return 0
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}
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}
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mem function int integerify
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# Quote a string for use in an SQL query. Examples:
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#
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# [quote {hello world}] == {'hello world'}
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# [quote {hello world's}] == {'hello world''s'}
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#
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proc quote {txt} {
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regsub -all ' $txt '' q
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return '$q'
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}
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# Generate a single line of output in the statistics section of the
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# report.
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#
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proc statline {title value {extra {}}} {
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set len [string length $title]
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set dots [string range {......................................} $len end]
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set len [string length $value]
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set sp2 [string range { } $len end]
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if {$extra ne ""} {
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set extra " $extra"
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}
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puts "$title$dots $value$sp2$extra"
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}
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# Generate a formatted percentage value for $num/$denom
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#
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proc percent {num denom {of {}}} {
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if {$denom==0.0} {return ""}
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set v [expr {$num*100.0/$denom}]
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set of {}
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if {$v==100.0 || $v<0.001 || ($v>1.0 && $v<99.0)} {
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return [format {%5.1f%% %s} $v $of]
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} elseif {$v<0.1 || $v>99.9} {
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return [format {%7.3f%% %s} $v $of]
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} else {
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return [format {%6.2f%% %s} $v $of]
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}
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}
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proc divide {num denom} {
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if {$denom==0} {return 0.0}
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return [format %.2f [expr double($num)/double($denom)]]
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}
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# Generate a subreport that covers some subset of the database.
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# the $where clause determines which subset to analyze.
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#
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proc subreport {title where} {
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global pageSize file_pgcnt compressOverhead
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# Query the in-memory database for the sum of various statistics
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# for the subset of tables/indices identified by the WHERE clause in
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# $where. Note that even if the WHERE clause matches no rows, the
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# following query returns exactly one row (because it is an aggregate).
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#
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# The results of the query are stored directly by SQLite into local
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# variables (i.e. $nentry, $nleaf etc.).
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#
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mem eval "
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SELECT
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int(sum(nentry)) AS nentry,
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int(sum(leaf_entries)) AS nleaf,
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int(sum(payload)) AS payload,
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int(sum(ovfl_payload)) AS ovfl_payload,
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max(mx_payload) AS mx_payload,
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int(sum(ovfl_cnt)) as ovfl_cnt,
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int(sum(leaf_pages)) AS leaf_pages,
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int(sum(int_pages)) AS int_pages,
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int(sum(ovfl_pages)) AS ovfl_pages,
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int(sum(leaf_unused)) AS leaf_unused,
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int(sum(int_unused)) AS int_unused,
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int(sum(ovfl_unused)) AS ovfl_unused,
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int(sum(gap_cnt)) AS gap_cnt,
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int(sum(compressed_size)) AS compressed_size
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FROM space_used WHERE $where" {} {}
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# Output the sub-report title, nicely decorated with * characters.
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#
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puts ""
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set len [string length $title]
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set stars [string repeat * [expr 65-$len]]
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puts "*** $title $stars"
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puts ""
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# Calculate statistics and store the results in TCL variables, as follows:
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#
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# total_pages: Database pages consumed.
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# total_pages_percent: Pages consumed as a percentage of the file.
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# storage: Bytes consumed.
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# payload_percent: Payload bytes used as a percentage of $storage.
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# total_unused: Unused bytes on pages.
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# avg_payload: Average payload per btree entry.
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# avg_fanout: Average fanout for internal pages.
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# avg_unused: Average unused bytes per btree entry.
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# ovfl_cnt_percent: Percentage of btree entries that use overflow pages.
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#
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set total_pages [expr {$leaf_pages+$int_pages+$ovfl_pages}]
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set total_pages_percent [percent $total_pages $file_pgcnt]
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set storage [expr {$total_pages*$pageSize}]
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set payload_percent [percent $payload $storage {of storage consumed}]
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set total_unused [expr {$ovfl_unused+$int_unused+$leaf_unused}]
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set avg_payload [divide $payload $nleaf]
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set avg_unused [divide $total_unused $nleaf]
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if {$int_pages>0} {
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# TODO: Is this formula correct?
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set nTab [mem eval "
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SELECT count(*) FROM (
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SELECT DISTINCT tblname FROM space_used WHERE $where AND is_index=0
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)
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"]
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set avg_fanout [mem eval "
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SELECT (sum(leaf_pages+int_pages)-$nTab)/sum(int_pages) FROM space_used
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WHERE $where AND is_index = 0
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"]
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set avg_fanout [format %.2f $avg_fanout]
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}
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set ovfl_cnt_percent [percent $ovfl_cnt $nleaf {of all entries}]
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# Print out the sub-report statistics.
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#
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statline {Percentage of total database} $total_pages_percent
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statline {Number of entries} $nleaf
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statline {Bytes of storage consumed} $storage
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if {$compressed_size!=$storage} {
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set compressed_size [expr {$compressed_size+$compressOverhead*$total_pages}]
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set pct [expr {$compressed_size*100.0/$storage}]
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set pct [format {%5.1f%%} $pct]
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statline {Bytes used after compression} $compressed_size $pct
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}
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statline {Bytes of payload} $payload $payload_percent
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statline {Average payload per entry} $avg_payload
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statline {Average unused bytes per entry} $avg_unused
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if {[info exists avg_fanout]} {
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statline {Average fanout} $avg_fanout
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}
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if {$total_pages>1} {
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set fragmentation [percent $gap_cnt [expr {$total_pages-1}] {fragmentation}]
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statline {Fragmentation} $fragmentation
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}
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statline {Maximum payload per entry} $mx_payload
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statline {Entries that use overflow} $ovfl_cnt $ovfl_cnt_percent
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if {$int_pages>0} {
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statline {Index pages used} $int_pages
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}
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statline {Primary pages used} $leaf_pages
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statline {Overflow pages used} $ovfl_pages
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statline {Total pages used} $total_pages
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if {$int_unused>0} {
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set int_unused_percent [
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percent $int_unused [expr {$int_pages*$pageSize}] {of index space}]
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statline "Unused bytes on index pages" $int_unused $int_unused_percent
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}
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statline "Unused bytes on primary pages" $leaf_unused [
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percent $leaf_unused [expr {$leaf_pages*$pageSize}] {of primary space}]
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statline "Unused bytes on overflow pages" $ovfl_unused [
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percent $ovfl_unused [expr {$ovfl_pages*$pageSize}] {of overflow space}]
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statline "Unused bytes on all pages" $total_unused [
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percent $total_unused $storage {of all space}]
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return 1
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}
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# Calculate the overhead in pages caused by auto-vacuum.
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#
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# This procedure calculates and returns the number of pages used by the
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# auto-vacuum 'pointer-map'. If the database does not support auto-vacuum,
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# then 0 is returned. The two arguments are the size of the database file in
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# pages and the page size used by the database (in bytes).
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proc autovacuum_overhead {filePages pageSize} {
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# Set $autovacuum to non-zero for databases that support auto-vacuum.
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set autovacuum [db one {PRAGMA auto_vacuum}]
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# If the database is not an auto-vacuum database or the file consists
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# of one page only then there is no overhead for auto-vacuum. Return zero.
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if {0==$autovacuum || $filePages==1} {
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return 0
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}
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# The number of entries on each pointer map page. The layout of the
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# database file is one pointer-map page, followed by $ptrsPerPage other
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# pages, followed by a pointer-map page etc. The first pointer-map page
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# is the second page of the file overall.
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set ptrsPerPage [expr double($pageSize/5)]
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# Return the number of pointer map pages in the database.
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return [expr wide(ceil( ($filePages-1.0)/($ptrsPerPage+1.0) ))]
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}
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# Calculate the summary statistics for the database and store the results
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# in TCL variables. They are output below. Variables are as follows:
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#
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# pageSize: Size of each page in bytes.
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# file_bytes: File size in bytes.
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# file_pgcnt: Number of pages in the file.
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# file_pgcnt2: Number of pages in the file (calculated).
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# av_pgcnt: Pages consumed by the auto-vacuum pointer-map.
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# av_percent: Percentage of the file consumed by auto-vacuum pointer-map.
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# inuse_pgcnt: Data pages in the file.
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# inuse_percent: Percentage of pages used to store data.
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# free_pgcnt: Free pages calculated as (<total pages> - <in-use pages>)
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# free_pgcnt2: Free pages in the file according to the file header.
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# free_percent: Percentage of file consumed by free pages (calculated).
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# free_percent2: Percentage of file consumed by free pages (header).
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# ntable: Number of tables in the db.
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# nindex: Number of indices in the db.
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# nautoindex: Number of indices created automatically.
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# nmanindex: Number of indices created manually.
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# user_payload: Number of bytes of payload in table btrees
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# (not including sqlite_master)
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# user_percent: $user_payload as a percentage of total file size.
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### The following, setting $file_bytes based on the actual size of the file
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### on disk, causes this tool to choke on zipvfs databases. So set it based
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### on the return of [PRAGMA page_count] instead.
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if 0 {
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set file_bytes [file size $file_to_analyze]
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set file_pgcnt [expr {$file_bytes/$pageSize}]
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}
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set file_pgcnt [db one {PRAGMA page_count}]
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set file_bytes [expr {$file_pgcnt * $pageSize}]
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set av_pgcnt [autovacuum_overhead $file_pgcnt $pageSize]
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|
set av_percent [percent $av_pgcnt $file_pgcnt]
|
|
|
|
set sql {SELECT sum(leaf_pages+int_pages+ovfl_pages) FROM space_used}
|
|
set inuse_pgcnt [expr wide([mem eval $sql])]
|
|
set inuse_percent [percent $inuse_pgcnt $file_pgcnt]
|
|
|
|
set free_pgcnt [expr {$file_pgcnt-$inuse_pgcnt-$av_pgcnt}]
|
|
set free_percent [percent $free_pgcnt $file_pgcnt]
|
|
set free_pgcnt2 [db one {PRAGMA freelist_count}]
|
|
set free_percent2 [percent $free_pgcnt2 $file_pgcnt]
|
|
|
|
set file_pgcnt2 [expr {$inuse_pgcnt+$free_pgcnt2+$av_pgcnt}]
|
|
|
|
set ntable [db eval {SELECT count(*)+1 FROM sqlite_master WHERE type='table'}]
|
|
set nindex [db eval {SELECT count(*) FROM sqlite_master WHERE type='index'}]
|
|
set sql {SELECT count(*) FROM sqlite_master WHERE name LIKE 'sqlite_autoindex%'}
|
|
set nautoindex [db eval $sql]
|
|
set nmanindex [expr {$nindex-$nautoindex}]
|
|
|
|
# set total_payload [mem eval "SELECT sum(payload) FROM space_used"]
|
|
set user_payload [mem one {SELECT int(sum(payload)) FROM space_used
|
|
WHERE NOT is_index AND name NOT LIKE 'sqlite_master'}]
|
|
set user_percent [percent $user_payload $file_bytes]
|
|
|
|
# Output the summary statistics calculated above.
|
|
#
|
|
puts "/** Disk-Space Utilization Report For $root_filename"
|
|
catch {
|
|
puts "*** As of [clock format [clock seconds] -format {%Y-%b-%d %H:%M:%S}]"
|
|
}
|
|
puts ""
|
|
statline {Page size in bytes} $pageSize
|
|
statline {Pages in the whole file (measured)} $file_pgcnt
|
|
statline {Pages in the whole file (calculated)} $file_pgcnt2
|
|
statline {Pages that store data} $inuse_pgcnt $inuse_percent
|
|
statline {Pages on the freelist (per header)} $free_pgcnt2 $free_percent2
|
|
statline {Pages on the freelist (calculated)} $free_pgcnt $free_percent
|
|
statline {Pages of auto-vacuum overhead} $av_pgcnt $av_percent
|
|
statline {Number of tables in the database} $ntable
|
|
statline {Number of indices} $nindex
|
|
statline {Number of named indices} $nmanindex
|
|
statline {Automatically generated indices} $nautoindex
|
|
if {$isCompressed} {
|
|
statline {Size of uncompressed content in bytes} $file_bytes
|
|
set efficiency [percent $true_file_size $file_bytes]
|
|
statline {Size of compressed file on disk} $true_file_size $efficiency
|
|
} else {
|
|
statline {Size of the file in bytes} $file_bytes
|
|
}
|
|
statline {Bytes of user payload stored} $user_payload $user_percent
|
|
|
|
# Output table rankings
|
|
#
|
|
puts ""
|
|
puts "*** Page counts for all tables with their indices ********************"
|
|
puts ""
|
|
mem eval {SELECT tblname, count(*) AS cnt,
|
|
int(sum(int_pages+leaf_pages+ovfl_pages)) AS size
|
|
FROM space_used GROUP BY tblname ORDER BY size+0 DESC, tblname} {} {
|
|
statline [string toupper $tblname] $size [percent $size $file_pgcnt]
|
|
}
|
|
if {$isCompressed} {
|
|
puts ""
|
|
puts "*** Bytes of disk space used after compression ***********************"
|
|
puts ""
|
|
set csum 0
|
|
mem eval {SELECT tblname,
|
|
int(sum(compressed_size)) +
|
|
$compressOverhead*sum(int_pages+leaf_pages+ovfl_pages)
|
|
AS csize
|
|
FROM space_used GROUP BY tblname ORDER BY csize+0 DESC, tblname} {} {
|
|
incr csum $csize
|
|
statline [string toupper $tblname] $csize [percent $csize $true_file_size]
|
|
}
|
|
set overhead [expr {$true_file_size - $csum}]
|
|
if {$overhead>0} {
|
|
statline {Header and free space} $overhead [percent $overhead $true_file_size]
|
|
}
|
|
}
|
|
|
|
# Output subreports
|
|
#
|
|
if {$nindex>0} {
|
|
subreport {All tables and indices} 1
|
|
}
|
|
subreport {All tables} {NOT is_index}
|
|
if {$nindex>0} {
|
|
subreport {All indices} {is_index}
|
|
}
|
|
foreach tbl [mem eval {SELECT name FROM space_used WHERE NOT is_index
|
|
ORDER BY name}] {
|
|
regsub ' $tbl '' qn
|
|
set name [string toupper $tbl]
|
|
set n [mem eval "SELECT count(*) FROM space_used WHERE tblname='$qn'"]
|
|
if {$n>1} {
|
|
subreport "Table $name and all its indices" "tblname='$qn'"
|
|
subreport "Table $name w/o any indices" "name='$qn'"
|
|
subreport "Indices of table $name" "tblname='$qn' AND is_index"
|
|
} else {
|
|
subreport "Table $name" "name='$qn'"
|
|
}
|
|
}
|
|
|
|
# Output instructions on what the numbers above mean.
|
|
#
|
|
puts {
|
|
*** Definitions ******************************************************
|
|
|
|
Page size in bytes
|
|
|
|
The number of bytes in a single page of the database file.
|
|
Usually 1024.
|
|
|
|
Number of pages in the whole file
|
|
}
|
|
puts " The number of $pageSize-byte pages that go into forming the complete
|
|
database"
|
|
puts {
|
|
Pages that store data
|
|
|
|
The number of pages that store data, either as primary B*Tree pages or
|
|
as overflow pages. The number at the right is the data pages divided by
|
|
the total number of pages in the file.
|
|
|
|
Pages on the freelist
|
|
|
|
The number of pages that are not currently in use but are reserved for
|
|
future use. The percentage at the right is the number of freelist pages
|
|
divided by the total number of pages in the file.
|
|
|
|
Pages of auto-vacuum overhead
|
|
|
|
The number of pages that store data used by the database to facilitate
|
|
auto-vacuum. This is zero for databases that do not support auto-vacuum.
|
|
|
|
Number of tables in the database
|
|
|
|
The number of tables in the database, including the SQLITE_MASTER table
|
|
used to store schema information.
|
|
|
|
Number of indices
|
|
|
|
The total number of indices in the database.
|
|
|
|
Number of named indices
|
|
|
|
The number of indices created using an explicit CREATE INDEX statement.
|
|
|
|
Automatically generated indices
|
|
|
|
The number of indices used to implement PRIMARY KEY or UNIQUE constraints
|
|
on tables.
|
|
|
|
Size of the file in bytes
|
|
|
|
The total amount of disk space used by the entire database files.
|
|
|
|
Bytes of user payload stored
|
|
|
|
The total number of bytes of user payload stored in the database. The
|
|
schema information in the SQLITE_MASTER table is not counted when
|
|
computing this number. The percentage at the right shows the payload
|
|
divided by the total file size.
|
|
|
|
Percentage of total database
|
|
|
|
The amount of the complete database file that is devoted to storing
|
|
information described by this category.
|
|
|
|
Number of entries
|
|
|
|
The total number of B-Tree key/value pairs stored under this category.
|
|
|
|
Bytes of storage consumed
|
|
|
|
The total amount of disk space required to store all B-Tree entries
|
|
under this category. The is the total number of pages used times
|
|
the pages size.
|
|
|
|
Bytes of payload
|
|
|
|
The amount of payload stored under this category. Payload is the data
|
|
part of table entries and the key part of index entries. The percentage
|
|
at the right is the bytes of payload divided by the bytes of storage
|
|
consumed.
|
|
|
|
Average payload per entry
|
|
|
|
The average amount of payload on each entry. This is just the bytes of
|
|
payload divided by the number of entries.
|
|
|
|
Average unused bytes per entry
|
|
|
|
The average amount of free space remaining on all pages under this
|
|
category on a per-entry basis. This is the number of unused bytes on
|
|
all pages divided by the number of entries.
|
|
|
|
Fragmentation
|
|
|
|
The percentage of pages in the table or index that are not
|
|
consecutive in the disk file. Many filesystems are optimized
|
|
for sequential file access so smaller fragmentation numbers
|
|
sometimes result in faster queries, especially for larger
|
|
database files that do not fit in the disk cache.
|
|
|
|
Maximum payload per entry
|
|
|
|
The largest payload size of any entry.
|
|
|
|
Entries that use overflow
|
|
|
|
The number of entries that user one or more overflow pages.
|
|
|
|
Total pages used
|
|
|
|
This is the number of pages used to hold all information in the current
|
|
category. This is the sum of index, primary, and overflow pages.
|
|
|
|
Index pages used
|
|
|
|
This is the number of pages in a table B-tree that hold only key (rowid)
|
|
information and no data.
|
|
|
|
Primary pages used
|
|
|
|
This is the number of B-tree pages that hold both key and data.
|
|
|
|
Overflow pages used
|
|
|
|
The total number of overflow pages used for this category.
|
|
|
|
Unused bytes on index pages
|
|
|
|
The total number of bytes of unused space on all index pages. The
|
|
percentage at the right is the number of unused bytes divided by the
|
|
total number of bytes on index pages.
|
|
|
|
Unused bytes on primary pages
|
|
|
|
The total number of bytes of unused space on all primary pages. The
|
|
percentage at the right is the number of unused bytes divided by the
|
|
total number of bytes on primary pages.
|
|
|
|
Unused bytes on overflow pages
|
|
|
|
The total number of bytes of unused space on all overflow pages. The
|
|
percentage at the right is the number of unused bytes divided by the
|
|
total number of bytes on overflow pages.
|
|
|
|
Unused bytes on all pages
|
|
|
|
The total number of bytes of unused space on all primary and overflow
|
|
pages. The percentage at the right is the number of unused bytes
|
|
divided by the total number of bytes.
|
|
}
|
|
|
|
# Output a dump of the in-memory database. This can be used for more
|
|
# complex offline analysis.
|
|
#
|
|
puts "**********************************************************************"
|
|
puts "The entire text of this report can be sourced into any SQL database"
|
|
puts "engine for further analysis. All of the text above is an SQL comment."
|
|
puts "The data used to generate this report follows:"
|
|
puts "*/"
|
|
puts "BEGIN;"
|
|
puts $tabledef
|
|
unset -nocomplain x
|
|
mem eval {SELECT * FROM space_used} x {
|
|
puts -nonewline "INSERT INTO space_used VALUES"
|
|
set sep (
|
|
foreach col $x(*) {
|
|
set v $x($col)
|
|
if {$v=="" || ![string is double $v]} {set v [quote $v]}
|
|
puts -nonewline $sep$v
|
|
set sep ,
|
|
}
|
|
puts ");"
|
|
}
|
|
puts "COMMIT;"
|
|
|
|
} err]} {
|
|
puts "ERROR: $err"
|
|
puts $errorInfo
|
|
exit 1
|
|
}
|