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# 2007 March 24
#
# The author disclaims copyright to this source code. In place of
# a legal notice, here is a blessing:
#
# May you do good and not evil.
# May you find forgiveness for yourself and forgive others.
# May you share freely, never taking more than you give.
#
#***********************************************************************
#
# $Id: cache.test,v 1.4 2007/08/22 02:56:44 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable {!pager_pragmas} {
finish_test
return
}
sqlite3_soft_heap_limit 0
proc pager_cache_size {db} {
set bt [btree_from_db $db]
db_enter $db
array set stats [btree_pager_stats $bt]
db_leave $db
return $stats(page)
}
do_test cache-1.1 {
pager_cache_size db
} {0}
do_test cache-1.2 {
execsql {
PRAGMA auto_vacuum=OFF;
CREATE TABLE abc(a, b, c);
INSERT INTO abc VALUES(1, 2, 3);
}
pager_cache_size db
} {2}
# At one point, repeatedly locking and unlocking the cache was causing
# a resource leak of one page per repetition. The page wasn't actually
# leaked, but would not be reused until the pager-cache was full (i.e.
# 2000 pages by default).
#
# This tests that once the pager-cache is initialised, it can be locked
# and unlocked repeatedly without internally allocating any new pages.
#
set cache_size [pager_cache_size db]
for {set ii 0} {$ii < 10} {incr ii} {
do_test cache-1.3.$ii {
execsql {SELECT * FROM abc}
pager_cache_size db
} $::cache_size
}
sqlite3_soft_heap_limit $soft_limit
finish_test
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