3 # The author disclaims copyright to this source code. In place of
4 # a legal notice, here is a blessing:
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.
10 #***********************************************************************
12 set testdir [file dirname $argv0]
13 source $testdir/tester.tcl
14 set testprefix tempdb2
20 if {$::TEMP_STORE>=2} { set unlocked unknown }
22 proc int2str {i} { string range [string repeat "$i." 450] 0 899 }
23 db func int2str int2str
25 #-------------------------------------------------------------------------
27 # 1.1: Write a big transaction to the db. One so large that it forces
28 # the file to be created and the cache flushed to disk on COMMIT.
30 # 1.2: Write a small transaction - one small enough that it remains in
31 # memory on COMMIT. All the pages of table [t1] are now dirty.
33 # 1.3: Delete the contents of [t1]. This moves all of its leaves to the
34 # free-list and causes the btree layer to call PagerDontWrite() on
37 # Then do a big update on table [t2]. So big that the former leaves
38 # of [t1] are forced out of the cache. Then roll back the transaction.
39 # If the PagerDontWrite() calls are honoured and the data is not written
40 # to disk, the update made in test 1.2 will be lost at this point. Or, if
41 # they are ignored (as they should be for temp databases), the update
42 # will be safely written out to disk before the cache entries are
46 PRAGMA page_size=1024;
50 CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
51 INSERT INTO t1 VALUES(1, int2str(1));
52 INSERT INTO t1 VALUES(2, int2str(1));
53 INSERT INTO t1 VALUES(3, int2str(1));
55 CREATE TABLE t2(a INTEGER PRIMARY KEY, b);
56 WITH c(x) AS ( VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100 )
57 INSERT INTO t2 SELECT x, int2str(x) FROM c;
61 } [list main $unlocked temp closed]
64 UPDATE t1 SET b=int2str(2);
65 SELECT b=int2str(2) FROM t1
71 UPDATE t2 SET b=int2str(a+1);
76 SELECT b=int2str(2) FROM t1
79 #-------------------------------------------------------------------------
82 db func int2str int2str
85 PRAGMA cache_size = -100;
86 CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
87 WITH c(x) AS ( VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100 )
88 INSERT INTO t1 SELECT x, int2str(x) FROM c;
92 INSERT INTO t1 VALUES(10001, int2str(1001) || int2str(1001) || int2str(1001));
96 SELECT b FROM t1 WHERE a = 10001;
97 } "[int2str 1001][int2str 1001][int2str 1001]"