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 # This test verifies a couple of specific potential data corruption
13 # scenarios involving crashes or power failures.
15 # Later: Also, some other specific scenarios required for coverage
16 # testing that do not lead to corruption.
18 # $Id: crash8.test,v 1.4 2009/01/11 00:44:48 drh Exp $
21 set testdir [file dirname $argv0]
22 source $testdir/tester.tcl
24 ifcapable !crashtest {
32 PRAGMA auto_vacuum=OFF;
33 CREATE TABLE t1(a, b);
34 CREATE INDEX i1 ON t1(a, b);
35 INSERT INTO t1 VALUES(1, randstr(1000,1000));
36 INSERT INTO t1 VALUES(2, randstr(1000,1000));
37 INSERT INTO t1 VALUES(3, randstr(1000,1000));
38 INSERT INTO t1 VALUES(4, randstr(1000,1000));
39 INSERT INTO t1 VALUES(5, randstr(1000,1000));
40 INSERT INTO t1 VALUES(6, randstr(1000,1000));
41 CREATE TABLE t2(a, b);
42 CREATE TABLE t3(a, b);
43 CREATE TABLE t4(a, b);
44 CREATE TABLE t5(a, b);
45 CREATE TABLE t6(a, b);
46 CREATE TABLE t7(a, b);
47 CREATE TABLE t8(a, b);
48 CREATE TABLE t9(a, b);
49 CREATE TABLE t10(a, b);
50 PRAGMA integrity_check
55 # Potential corruption scenario 1. A second process opens the database
56 # and modifies a large portion of it. It then opens a second transaction
57 # and modifies a small part of the database, but crashes before it commits
60 # When the first process accessed the database again, it was rolling back
61 # the aborted transaction, but was not purging its in-memory cache (which
62 # was loaded before the second process made its first, successful,
63 # modification). Producing an inconsistent cache.
66 crashsql -delay 2 -file test.db {
67 PRAGMA cache_size = 10;
68 UPDATE t1 SET b = randstr(1000,1000);
69 INSERT INTO t9 VALUES(1, 2);
71 } {1 {child process exited abnormally}}
73 execsql {PRAGMA integrity_check}
76 # Potential corruption scenario 2. The second process, operating in
77 # persistent-journal mode, makes a large change to the database file
78 # with a small in-memory cache. Such that more than one journal-header
79 # was written to the file. It then opens a second transaction and makes
80 # a smaller change that requires only a single journal-header to be
81 # written to the journal file. The second change is such that the
82 # journal content written to the persistent journal file exactly overwrites
83 # the first journal-header and set of subsequent records written by the
84 # first, successful, change. The second process crashes before it can
85 # commit its second change.
87 # When the first process accessed the database again, it was rolling back
88 # the second aborted transaction, then continuing to rollback the second
89 # and subsequent journal-headers written by the first, successful, change.
90 # Database corruption.
93 crashsql -delay 2 -file test.db {
94 PRAGMA journal_mode = persist;
95 PRAGMA cache_size = 10;
96 UPDATE t1 SET b = randstr(1000,1000);
97 PRAGMA cache_size = 100;
99 INSERT INTO t2 VALUES('a', 'b');
100 INSERT INTO t3 VALUES('a', 'b');
101 INSERT INTO t4 VALUES('a', 'b');
102 INSERT INTO t5 VALUES('a', 'b');
103 INSERT INTO t6 VALUES('a', 'b');
104 INSERT INTO t7 VALUES('a', 'b');
105 INSERT INTO t8 VALUES('a', 'b');
106 INSERT INTO t9 VALUES('a', 'b');
107 INSERT INTO t10 VALUES('a', 'b');
110 } {1 {child process exited abnormally}}
113 execsql {PRAGMA integrity_check}
116 proc read_file {zFile} {
118 fconfigure $fd -translation binary
123 proc write_file {zFile zData} {
124 set fd [open $zFile w]
125 fconfigure $fd -translation binary
126 puts -nonewline $fd $zData
130 # The following tests check that SQLite will not roll back a hot-journal
131 # file if the sector-size field in the first journal file header is
132 # suspect. Definition of suspect:
134 # a) Not a power of 2, or (crash8-3.5)
135 # b) Greater than 0x01000000 (16MB), or (crash8-3.6)
136 # c) Less than 512. (crash8-3.7)
138 # Also test that SQLite will not rollback a hot-journal file with a
139 # suspect page-size. In this case "suspect" means:
141 # a) Not a power of 2, or
142 # b) Less than 512, or
143 # c) Greater than SQLITE_MAX_PAGE_SIZE
146 list [file exists test.db-joural] [file exists test.db]
150 PRAGMA synchronous = off;
153 SELECT count(*) FROM t1;
157 set zJournal [read_file test.db-journal]
160 SELECT count(*) FROM t1;
164 binary scan [string range $zJournal 20 23] I nSector
169 set zJournal2 [string replace $zJournal 20 23 [binary format I 513]]
170 write_file test.db-journal $zJournal2
173 SELECT count(*) FROM t1;
174 PRAGMA integrity_check
178 set zJournal2 [string replace $zJournal 20 23 [binary format I 0x2000000]]
179 write_file test.db-journal $zJournal2
181 SELECT count(*) FROM t1;
182 PRAGMA integrity_check
186 set zJournal2 [string replace $zJournal 20 23 [binary format I 256]]
187 write_file test.db-journal $zJournal2
189 SELECT count(*) FROM t1;
190 PRAGMA integrity_check
195 set zJournal2 [string replace $zJournal 24 27 [binary format I 513]]
196 write_file test.db-journal $zJournal2
199 SELECT count(*) FROM t1;
200 PRAGMA integrity_check
204 set big [expr $SQLITE_MAX_PAGE_SIZE * 2]
205 set zJournal2 [string replace $zJournal 24 27 [binary format I $big]]
206 write_file test.db-journal $zJournal2
208 SELECT count(*) FROM t1;
209 PRAGMA integrity_check
212 do_test crash8-3.10 {
213 set zJournal2 [string replace $zJournal 24 27 [binary format I 256]]
214 write_file test.db-journal $zJournal2
216 SELECT count(*) FROM t1;
217 PRAGMA integrity_check
221 do_test crash8-3.11 {
222 set fd [open test.db-journal w]
223 fconfigure $fd -translation binary
224 puts -nonewline $fd $zJournal
227 SELECT count(*) FROM t1;
228 PRAGMA integrity_check
233 # If a connection running in persistent-journal mode is part of a
234 # multi-file transaction, it must ensure that the master-journal name
235 # appended to the journal file contents during the commit is located
236 # at the end of the physical journal file. If there was already a
237 # large journal file allocated at the start of the transaction, this
238 # may mean truncating the file so that the master journal name really
239 # is at the physical end of the file.
241 # This block of tests test that SQLite correctly truncates such
242 # journal files, and that the results behave correctly if a hot-journal
251 PRAGMA journal_mode = persist;
252 CREATE TABLE ab(a, b);
253 INSERT INTO ab VALUES(0, 'abc');
254 INSERT INTO ab VALUES(1, NULL);
255 INSERT INTO ab VALUES(2, NULL);
256 INSERT INTO ab VALUES(3, NULL);
257 INSERT INTO ab VALUES(4, NULL);
258 INSERT INTO ab VALUES(5, NULL);
259 INSERT INTO ab VALUES(6, NULL);
260 UPDATE ab SET b = randstr(1000,1000);
261 ATTACH 'test2.db' AS aux;
262 PRAGMA aux.journal_mode = persist;
263 CREATE TABLE aux.ab(a, b);
264 INSERT INTO aux.ab SELECT * FROM main.ab;
266 UPDATE aux.ab SET b = randstr(1000,1000) WHERE a>=1;
267 UPDATE ab SET b = randstr(1000,1000) WHERE a>=1;
269 list [file exists test.db-journal] [file exists test2.db-journal]
275 UPDATE aux.ab SET b = 'def' WHERE a = 0;
276 UPDATE main.ab SET b = 'def' WHERE a = 0;
283 UPDATE aux.ab SET b = randstr(1000,1000) WHERE a>=1;
284 UPDATE ab SET b = randstr(1000,1000) WHERE a>=1;
288 set contents_main [db eval {SELECT b FROM main.ab WHERE a = 1}]
289 set contents_aux [db eval {SELECT b FROM aux.ab WHERE a = 1}]
292 crashsql -file test2.db -delay 1 {
293 ATTACH 'test2.db' AS aux;
295 UPDATE aux.ab SET b = 'ghi' WHERE a = 0;
296 UPDATE main.ab SET b = 'ghi' WHERE a = 0;
299 } {1 {child process exited abnormally}}
302 list [file exists test.db-journal] [file exists test2.db-journal]
307 SELECT b FROM main.ab WHERE a = 0;
308 SELECT b FROM aux.ab WHERE a = 0;
313 crashsql -file test2.db -delay 1 {
314 ATTACH 'test2.db' AS aux;
316 UPDATE aux.ab SET b = 'jkl' WHERE a = 0;
317 UPDATE main.ab SET b = 'jkl' WHERE a = 0;
320 } {1 {child process exited abnormally}}
323 set fd [open test.db-journal]
324 fconfigure $fd -translation binary
326 binary scan [read $fd 4] I len
328 seek $fd [expr {-1 * ($len + 16)}] end
329 set zMasterJournal [read $fd $len]
332 file exists $zMasterJournal
336 execsql { SELECT b FROM aux.ab WHERE a = 0 }
339 do_test crash8-4.10 {
340 delete_file $zMasterJournal
341 execsql { SELECT b FROM main.ab WHERE a = 0 }
346 # Since the following tests (crash8-5.*) rely upon being able
347 # to copy a file while open, they will not work on Windows.
349 if {$::tcl_platform(platform)=="unix"} {
350 for {set i 1} {$i < 10} {incr i} {
352 forcedelete test.db test.db-journal
354 do_test crash8-5.$i.1 {
356 CREATE TABLE t1(x PRIMARY KEY);
357 INSERT INTO t1 VALUES(randomblob(900));
358 INSERT INTO t1 SELECT randomblob(900) FROM t1;
359 INSERT INTO t1 SELECT randomblob(900) FROM t1;
360 INSERT INTO t1 SELECT randomblob(900) FROM t1;
361 INSERT INTO t1 SELECT randomblob(900) FROM t1;
362 INSERT INTO t1 SELECT randomblob(900) FROM t1;
363 INSERT INTO t1 SELECT randomblob(900) FROM t1; /* 64 rows */
365 crashsql -file test.db -delay [expr ($::i%2) + 1] {
366 PRAGMA cache_size = 10;
368 UPDATE t1 SET x = randomblob(900);
370 INSERT INTO t1 VALUES(randomblob(900));
372 execsql { PRAGMA integrity_check }
376 forcedelete test.db test.db-journal
378 do_test crash8-5.$i.2 {
380 PRAGMA cache_size = 10;
381 CREATE TABLE t1(x PRIMARY KEY);
382 INSERT INTO t1 VALUES(randomblob(900));
383 INSERT INTO t1 SELECT randomblob(900) FROM t1;
384 INSERT INTO t1 SELECT randomblob(900) FROM t1;
385 INSERT INTO t1 SELECT randomblob(900) FROM t1;
386 INSERT INTO t1 SELECT randomblob(900) FROM t1;
387 INSERT INTO t1 SELECT randomblob(900) FROM t1;
388 INSERT INTO t1 SELECT randomblob(900) FROM t1; /* 64 rows */
390 UPDATE t1 SET x = randomblob(900);
392 forcedelete testX.db testX.db-journal testX.db-wal
393 forcecopy test.db testX.db
394 forcecopy test.db-journal testX.db-journal
397 crashsql -file test.db -delay [expr ($::i%2) + 1] {
398 SELECT * FROM sqlite_master;
399 INSERT INTO t1 VALUES(randomblob(900));
403 execsql { PRAGMA integrity_check } db2