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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||!compound {
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 $stats(page)
}
if {[permutation] == ""} {
do_test cache-1.1 { pager_cache_size db } {0}
}
do_test cache-1.2 {
execsql {
PRAGMA auto_vacuum=OFF;
CREATE TABLE abc(a, b, c);
INSERT INTO abc VALUES(1, 2, 3);
}
pager_cache_size db
} {2}
# At one point, repeatedly locking and unlocking the cache was causing
# a resource leak of one page per repetition. The page wasn't actually
# leaked, but would not be reused until the pager-cache was full (i.e.
# 2000 pages by default).
#
# This tests that once the pager-cache is initialized, it can be locked
# and unlocked repeatedly without internally allocating any new pages.
#
set cache_size [pager_cache_size db]
for {set ii 0} {$ii < 10} {incr ii} {
do_test cache-1.3.$ii {
execsql {SELECT * FROM abc}
pager_cache_size db
} $::cache_size
}
#-------------------------------------------------------------------------
# This block of tests checks that it is possible to set the cache_size of a
# database to a small (< 10) value. More specifically:
#
# cache-2.1.*: Test that "PRAGMA cache_size" appears to work with small
# values.
# cache-2.2.*: Test that "PRAGMA main.cache_size" appears to work with
# small values.
# cache-2.3.*: Test cache_size=1 correctly spills/flushes the cache.
# cache-2.4.*: Test cache_size=0 correctly spills/flushes the cache.
#
#
db_delete_and_reopen
do_execsql_test cache-2.0 {
PRAGMA auto_vacuum=OFF;
PRAGMA journal_mode=DELETE;
CREATE TABLE t1(a, b);
CREATE TABLE t2(c, d);
INSERT INTO t1 VALUES('x', 'y');
INSERT INTO t2 VALUES('i', 'j');
} {delete}
for {set i 0} {$i < 20} {incr i} {
do_execsql_test cache-2.1.$i.1 "PRAGMA cache_size = $i"
do_execsql_test cache-2.1.$i.2 "PRAGMA cache_size" $i
do_execsql_test cache-2.1.$i.3 "SELECT * FROM t1" {x y}
do_execsql_test cache-2.1.$i.4 "PRAGMA cache_size" $i
}
for {set i 0} {$i < 20} {incr i} {
do_execsql_test cache-2.2.$i.1 "PRAGMA main.cache_size = $i"
do_execsql_test cache-2.2.$i.2 "PRAGMA main.cache_size" $i
do_execsql_test cache-2.2.$i.3 "SELECT * FROM t1" {x y}
do_execsql_test cache-2.2.$i.4 "PRAGMA main.cache_size" $i
}
# Tests for cache_size = 1.
#
do_execsql_test cache-2.3.1 {
PRAGMA cache_size = 1;
BEGIN;
INSERT INTO t1 VALUES(1, 2);
PRAGMA lock_status;
} {main reserved temp closed}
do_test cache-2.3.2 { pager_cache_size db } 2
do_execsql_test cache-2.3.3 {
INSERT INTO t2 VALUES(1, 2);
PRAGMA lock_status;
} {main exclusive temp closed}
do_test cache-2.3.4 { pager_cache_size db } 2
do_execsql_test cache-2.3.5 COMMIT
do_test cache-2.3.6 { pager_cache_size db } 1
do_execsql_test cache-2.3.7 {
SELECT * FROM t1 UNION SELECT * FROM t2;
} {1 2 i j x y}
do_test cache-2.3.8 { pager_cache_size db } 1
# Tests for cache_size = 0.
#
do_execsql_test cache-2.4.1 {
PRAGMA cache_size = 0;
BEGIN;
INSERT INTO t1 VALUES(1, 2);
PRAGMA lock_status;
} {main reserved temp closed}
do_test cache-2.4.2 { pager_cache_size db } 2
do_execsql_test cache-2.4.3 {
INSERT INTO t2 VALUES(1, 2);
PRAGMA lock_status;
} {main exclusive temp closed}
do_test cache-2.4.4 { pager_cache_size db } 2
do_execsql_test cache-2.4.5 COMMIT
do_test cache-2.4.6 { pager_cache_size db } 0
do_execsql_test cache-2.4.7 {
SELECT * FROM t1 UNION SELECT * FROM t2;
} {1 2 i j x y}
do_test cache-2.4.8 { pager_cache_size db } 0
sqlite3_soft_heap_limit $cmdlinearg(soft-heap-limit)
finish_test