mirror of https://github.com/sqlite/sqlite
92 lines
2.8 KiB
Plaintext
92 lines
2.8 KiB
Plaintext
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# 2007 August 21
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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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#
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# The focus of this file is testing some specific characteristics of the
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# IO traffic generated by SQLite (making sure SQLite is not writing out
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# more database pages than it has to, stuff like that).
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#
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# $Id: io.test,v 1.1 2007/08/21 13:30:07 danielk1977 Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set ::nWrite 0
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proc nWrite {db} {
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set bt [btree_from_db $db]
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array set stats [btree_pager_stats $bt]
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set res [expr $stats(write) - $::nWrite]
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set ::nWrite $stats(write)
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set res
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}
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do_test io-1.1 {
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execsql {
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PRAGMA page_size = 1024;
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CREATE TABLE abc(a,b);
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}
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nWrite db
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} {2}
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# Insert into the table 4 records of aproximately 240 bytes each.
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# This should completely fill the root-page of the table. Each
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# INSERT causes 2 db pages to be written - the root-page of "abc"
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# and page 1 (db change-counter page).
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do_test io-1.2 {
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set ret [list]
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execsql { INSERT INTO abc VALUES(1,randstr(230,230)); }
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lappend ret [nWrite db]
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execsql { INSERT INTO abc VALUES(2,randstr(230,230)); }
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lappend ret [nWrite db]
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execsql { INSERT INTO abc VALUES(3,randstr(230,230)); }
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lappend ret [nWrite db]
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execsql { INSERT INTO abc VALUES(4,randstr(230,230)); }
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lappend ret [nWrite db]
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} {2 2 2 2}
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# Insert another 240 byte record. This causes two leaf pages
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# to be added to the root page of abc. 4 pages in total
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# are written to the db file - the two leaf pages, the root
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# of abc and the change-counter page.
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do_test io-1.3 {
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execsql { INSERT INTO abc VALUES(5,randstr(230,230)); }
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nWrite db
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} {4}
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# Insert another 3 240 byte records. After this, the tree consists of
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# the root-node, which is close to empty, and two leaf pages, both of
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# which are full.
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do_test io-1.4 {
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set ret [list]
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execsql { INSERT INTO abc VALUES(6,randstr(230,230)); }
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lappend ret [nWrite db]
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execsql { INSERT INTO abc VALUES(7,randstr(230,230)); }
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lappend ret [nWrite db]
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execsql { INSERT INTO abc VALUES(8,randstr(230,230)); }
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lappend ret [nWrite db]
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} {2 2 2}
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#db eval {select * from sqlite_master} {btree_tree_dump [btree_from_db db] 2}
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# This insert should use the quick-balance trick to add a third leaf
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# to the b-tree used to store table abc. It should only be necessary to
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# write to 3 pages to do this: the change-counter, the root-page and
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# the new leaf page.
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do_test io-1.5 {
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execsql { INSERT INTO abc VALUES(9,randstr(230,230)); }
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nWrite db
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} {3}
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#db eval {select * from sqlite_master} {btree_tree_dump [btree_from_db db] 2}
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finish_test
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