1# 2007 March 24 2# 3# The author disclaims copyright to this source code. In place of 4# a legal notice, here is a blessing: 5# 6# May you do good and not evil. 7# May you find forgiveness for yourself and forgive others. 8# May you share freely, never taking more than you give. 9# 10#*********************************************************************** 11# 12# $Id: cache.test,v 1.4 2007/08/22 02:56:44 drh Exp $ 13 14set testdir [file dirname $argv0] 15source $testdir/tester.tcl 16 17ifcapable {!pager_pragmas} { 18 finish_test 19 return 20} 21sqlite3_soft_heap_limit 0 22 23proc pager_cache_size {db} { 24 set bt [btree_from_db $db] 25 db_enter $db 26 array set stats [btree_pager_stats $bt] 27 db_leave $db 28 return $stats(page) 29} 30 31do_test cache-1.1 { 32 pager_cache_size db 33} {0} 34 35do_test cache-1.2 { 36 execsql { 37 PRAGMA auto_vacuum=OFF; 38 CREATE TABLE abc(a, b, c); 39 INSERT INTO abc VALUES(1, 2, 3); 40 } 41 pager_cache_size db 42} {2} 43 44# At one point, repeatedly locking and unlocking the cache was causing 45# a resource leak of one page per repetition. The page wasn't actually 46# leaked, but would not be reused until the pager-cache was full (i.e. 47# 2000 pages by default). 48# 49# This tests that once the pager-cache is initialised, it can be locked 50# and unlocked repeatedly without internally allocating any new pages. 51# 52set cache_size [pager_cache_size db] 53for {set ii 0} {$ii < 10} {incr ii} { 54 55 do_test cache-1.3.$ii { 56 execsql {SELECT * FROM abc} 57 pager_cache_size db 58 } $::cache_size 59 60} 61sqlite3_soft_heap_limit $cmdlinearg(soft-heap-limit) 62 63finish_test 64