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# 2007 March 24
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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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# $Id: cache.test,v 1.4 2007/08/22 02:56:44 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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ifcapable {!pager_pragmas} {
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finish_test
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return
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}
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sqlite3_soft_heap_limit 0
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proc pager_cache_size {db} {
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set bt [btree_from_db $db]
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db_enter $db
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array set stats [btree_pager_stats $bt]
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db_leave $db
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return $stats(page)
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}
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do_test cache-1.1 {
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pager_cache_size db
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} {0}
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do_test cache-1.2 {
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execsql {
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PRAGMA auto_vacuum=OFF;
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CREATE TABLE abc(a, b, c);
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INSERT INTO abc VALUES(1, 2, 3);
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}
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pager_cache_size db
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} {2}
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# At one point, repeatedly locking and unlocking the cache was causing
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# a resource leak of one page per repetition. The page wasn't actually
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# leaked, but would not be reused until the pager-cache was full (i.e.
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# 2000 pages by default).
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#
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# This tests that once the pager-cache is initialised, it can be locked
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# and unlocked repeatedly without internally allocating any new pages.
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#
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set cache_size [pager_cache_size db]
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for {set ii 0} {$ii < 10} {incr ii} {
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do_test cache-1.3.$ii {
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execsql {SELECT * FROM abc}
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pager_cache_size db
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} $::cache_size
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}
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sqlite3_soft_heap_limit $soft_limit
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finish_test
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