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 $testdir/tester.tcl
14 set testprefix tempdb2
19 proc int2str {i} { string range [string repeat "$i." 450] 0 899 }
20 db func int2str int2str
22 #-------------------------------------------------------------------------
24 # 1.1: Write a big transaction to the db. One so large that it forces
25 # the file to be created and the cache flushed to disk on COMMIT.
27 # 1.2: Write a small transaction - one small enough that it remains in
28 # memory on COMMIT. All the pages of table [t1] are now dirty.
30 # 1.3: Delete the contents of [t1]. This moves all of its leaves to the
31 # free-list and causes the btree layer to call PagerDontWrite() on
34 # Then do a big update on table [t2]. So big that the former leaves
35 # of [t1] are forced out of the cache. Then roll back the transaction.
36 # If the PagerDontWrite() calls are honoured and the data is not written
37 # to disk, the update made in test 1.2 will be lost at this point. Or, if
38 # they are ignored (as they should be for temp databases), the update
39 # will be safely written out to disk before the cache entries are
43 PRAGMA page_size=1024;
47 CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
48 INSERT INTO t1 VALUES(1, int2str(1));
49 INSERT INTO t1 VALUES(2, int2str(1));
50 INSERT INTO t1 VALUES(3, int2str(1));
52 CREATE TABLE t2(a INTEGER PRIMARY KEY, b);
53 WITH c(x) AS ( VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100 )
54 INSERT INTO t2 SELECT x, int2str(x) FROM c;
58 } {main unlocked temp closed}
61 UPDATE t1 SET b=int2str(2);
62 SELECT b=int2str(2) FROM t1
68 UPDATE t2 SET b=int2str(a+1);
73 SELECT b=int2str(2) FROM t1