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 1.1 2007/04/02 05:07:48 danielk1977 Exp $ 13 14set testdir [file dirname $argv0] 15source $testdir/tester.tcl 16 17ifcapable {!pager_pragmas} { 18 finish_test 19 return 20} 21 22proc pager_cache_size {db} { 23 set bt [btree_from_db $db] 24 array set stats [btree_pager_stats $bt] 25 return $stats(page) 26} 27 28do_test cache-1.1 { 29 pager_cache_size db 30} {0} 31 32do_test cache-1.2 { 33 execsql { 34 CREATE TABLE abc(a, b, c); 35 INSERT INTO abc VALUES(1, 2, 3); 36 } 37 pager_cache_size db 38} {2} 39 40# At one point, repeatedly locking and unlocking the cache was causing 41# a resource leak of one page per repetition. The page wasn't actually 42# leaked, but would not be reused until the pager-cache was full (i.e. 43# 2000 pages by default). 44# 45# This tests that once the pager-cache is initialised, it can be locked 46# and unlocked repeatedly without internally allocating any new pages. 47# 48set cache_size [pager_cache_size db] 49for {set ii 0} {$ii < 10} {incr ii} { 50 51 do_test cache-1.3.$ii { 52 execsql {SELECT * FROM abc} 53 pager_cache_size db 54 } $::cache_size 55 56} 57 58finish_test 59