695c83ac0e
EXPLAIN QUERY PLAN output format. FossilOrigin-Name: 9ac064fe2aee4aa1423e7c8043dfec52ecf2af3e8361ebb7d9c104cca82b4d23
105 lines
3.0 KiB
Plaintext
105 lines
3.0 KiB
Plaintext
# 2017 August 07
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library. The
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# focus of this script testing the ability of SQLite to use mmap
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# to access files larger than 4GiB.
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#
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if {[file exists skip-big-file]} return
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if {$tcl_platform(os)=="Darwin"} return
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set testprefix bigmmap
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ifcapable !mmap||!vtab {
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finish_test
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return
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}
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set mmap_limit 0
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db eval {
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SELECT compile_options AS x FROM pragma_compile_options
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WHERE x LIKE 'max_mmap_size=%'
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} {
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regexp {MAX_MMAP_SIZE=([0-9]*)} $x -> mmap_limit
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}
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if {$mmap_limit < [expr 8 * 1<<30]} {
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puts "Skipping bigmmap.test - requires SQLITE_MAX_MMAP_SIZE >= 8G"
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finish_test
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return
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}
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#-------------------------------------------------------------------------
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# Create the database file roughly 8GiB in size. Most pages are unused,
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# except that there is a table and index clustered around each 1GiB
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# boundary.
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#
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do_execsql_test 1.0 {
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PRAGMA page_size = 4096;
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CREATE TABLE t0(a INTEGER PRIMARY KEY, b, c, UNIQUE(b, c));
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WITH s(i) AS ( SELECT 1 UNION ALL SELECT i+1 FROM s LIMIT 100 )
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INSERT INTO t0 SELECT i, 't0', randomblob(800) FROM s;
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}
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for {set i 1} {$i < 8} {incr i} {
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fake_big_file [expr $i*1024] [get_pwd]/test.db
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hexio_write test.db 28 [format %.8x [expr ($i*1024*1024*1024/4096) - 5]]
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do_execsql_test 1.$i "
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CREATE TABLE t$i (a INTEGER PRIMARY KEY, b, c, UNIQUE(b, c));
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WITH s(i) AS ( SELECT 1 UNION ALL SELECT i+1 FROM s LIMIT 100 )
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INSERT INTO t$i SELECT i, 't$i', randomblob(800) FROM s;
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"
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}
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#-------------------------------------------------------------------------
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# Check that data can be retrieved from the db with a variety of
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# configured mmap size limits.
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#
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for {set i 0} {$i < 9} {incr i} {
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# Configure a memory mapping $i GB in size.
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#
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set val [expr $i*1024*1024*1024]
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execsql "PRAGMA main.mmap_size = $val"
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do_execsql_test 2.$i.0 {
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PRAGMA main.mmap_size
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} $val
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for {set t 0} {$t < 8} {incr t} {
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do_execsql_test 2.$i.$t.1 "
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SELECT count(*) FROM t$t;
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SELECT count(b || c) FROM t$t GROUP BY b;
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" {100 100}
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do_execsql_test 2.$i.$t.2 "
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SELECT * FROM t$t AS o WHERE
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NOT EXISTS( SELECT * FROM t$t AS i WHERE a=o.a AND +b=o.b AND +c=o.c )
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ORDER BY b, c;
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" {}
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do_eqp_test 2.$i.$t.3 "
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SELECT * FROM t$t AS o WHERE
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NOT EXISTS( SELECT * FROM t$t AS i WHERE a=o.a AND +b=o.b AND +c=o.c )
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ORDER BY b, c;
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" [string map {"\n " "\n"} "
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QUERY PLAN
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|--SCAN o USING COVERING INDEX sqlite_autoindex_t${t}_1
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`--CORRELATED SCALAR SUBQUERY xxxxxx
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`--SEARCH i USING INTEGER PRIMARY KEY (rowid=?)
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"]
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}
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}
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finish_test
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