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 {
31 PRAGMA auto_vacuum=OFF;
32 CREATE TABLE t1(a, b);
33 CREATE INDEX i1 ON t1(a, b);
34 INSERT INTO t1 VALUES(1, randstr(1000,1000));
35 INSERT INTO t1 VALUES(2, randstr(1000,1000));
36 INSERT INTO t1 VALUES(3, randstr(1000,1000));
37 INSERT INTO t1 VALUES(4, randstr(1000,1000));
38 INSERT INTO t1 VALUES(5, randstr(1000,1000));
39 INSERT INTO t1 VALUES(6, randstr(1000,1000));
40 CREATE TABLE t2(a, b);
41 CREATE TABLE t3(a, b);
42 CREATE TABLE t4(a, b);
43 CREATE TABLE t5(a, b);
44 CREATE TABLE t6(a, b);
45 CREATE TABLE t7(a, b);
46 CREATE TABLE t8(a, b);
47 CREATE TABLE t9(a, b);
48 CREATE TABLE t10(a, b);
49 PRAGMA integrity_check
54 # Potential corruption scenario 1. A second process opens the database
55 # and modifies a large portion of it. It then opens a second transaction
56 # and modifies a small part of the database, but crashes before it commits
59 # When the first process accessed the database again, it was rolling back
60 # the aborted transaction, but was not purging its in-memory cache (which
61 # was loaded before the second process made its first, successful,
62 # modification). Producing an inconsistent cache.
65 crashsql -delay 2 -file test.db {
66 PRAGMA cache_size = 10;
67 UPDATE t1 SET b = randstr(1000,1000);
68 INSERT INTO t9 VALUES(1, 2);
70 } {1 {child process exited abnormally}}
72 execsql {PRAGMA integrity_check}
75 # Potential corruption scenario 2. The second process, operating in
76 # persistent-journal mode, makes a large change to the database file
77 # with a small in-memory cache. Such that more than one journal-header
78 # was written to the file. It then opens a second transaction and makes
79 # a smaller change that requires only a single journal-header to be
80 # written to the journal file. The second change is such that the
81 # journal content written to the persistent journal file exactly overwrites
82 # the first journal-header and set of subsequent records written by the
83 # first, successful, change. The second process crashes before it can
84 # commit its second change.
86 # When the first process accessed the database again, it was rolling back
87 # the second aborted transaction, then continuing to rollback the second
88 # and subsequent journal-headers written by the first, successful, change.
89 # Database corruption.
92 crashsql -delay 2 -file test.db {
93 PRAGMA journal_mode = persist;
94 PRAGMA cache_size = 10;
95 UPDATE t1 SET b = randstr(1000,1000);
96 PRAGMA cache_size = 100;
98 INSERT INTO t2 VALUES('a', 'b');
99 INSERT INTO t3 VALUES('a', 'b');
100 INSERT INTO t4 VALUES('a', 'b');
101 INSERT INTO t5 VALUES('a', 'b');
102 INSERT INTO t6 VALUES('a', 'b');
103 INSERT INTO t7 VALUES('a', 'b');
104 INSERT INTO t8 VALUES('a', 'b');
105 INSERT INTO t9 VALUES('a', 'b');
106 INSERT INTO t10 VALUES('a', 'b');
109 } {1 {child process exited abnormally}}
112 execsql {PRAGMA integrity_check}
115 proc read_file {zFile} {
117 fconfigure $fd -translation binary
122 proc write_file {zFile zData} {
123 set fd [open $zFile w]
124 fconfigure $fd -translation binary
125 puts -nonewline $fd $zData
129 # The following tests check that SQLite will not roll back a hot-journal
130 # file if the sector-size field in the first journal file header is
131 # suspect. Definition of suspect:
133 # a) Not a power of 2, or (crash8-3.5)
134 # b) Greater than 0x01000000 (16MB), or (crash8-3.6)
135 # c) Less than 512. (crash8-3.7)
137 # Also test that SQLite will not rollback a hot-journal file with a
138 # suspect page-size. In this case "suspect" means:
140 # a) Not a power of 2, or
141 # b) Less than 512, or
142 # c) Greater than SQLITE_MAX_PAGE_SIZE
145 list [file exists test.db-joural] [file exists test.db]
149 PRAGMA synchronous = off;
152 SELECT count(*) FROM t1;
156 set zJournal [read_file test.db-journal]
159 SELECT count(*) FROM t1;
163 binary scan [string range $zJournal 20 23] I nSector
168 set zJournal2 [string replace $zJournal 20 23 [binary format I 513]]
169 write_file test.db-journal $zJournal2
172 SELECT count(*) FROM t1;
173 PRAGMA integrity_check
177 set zJournal2 [string replace $zJournal 20 23 [binary format I 0x2000000]]
178 write_file test.db-journal $zJournal2
180 SELECT count(*) FROM t1;
181 PRAGMA integrity_check
185 set zJournal2 [string replace $zJournal 20 23 [binary format I 256]]
186 write_file test.db-journal $zJournal2
188 SELECT count(*) FROM t1;
189 PRAGMA integrity_check
194 set zJournal2 [string replace $zJournal 24 27 [binary format I 513]]
195 write_file test.db-journal $zJournal2
198 SELECT count(*) FROM t1;
199 PRAGMA integrity_check
203 set big [expr $SQLITE_MAX_PAGE_SIZE * 2]
204 set zJournal2 [string replace $zJournal 24 27 [binary format I $big]]
205 write_file test.db-journal $zJournal2
207 SELECT count(*) FROM t1;
208 PRAGMA integrity_check
211 do_test crash8-3.10 {
212 set zJournal2 [string replace $zJournal 24 27 [binary format I 256]]
213 write_file test.db-journal $zJournal2
215 SELECT count(*) FROM t1;
216 PRAGMA integrity_check
220 do_test crash8-3.11 {
221 set fd [open test.db-journal w]
222 fconfigure $fd -translation binary
223 puts -nonewline $fd $zJournal
226 SELECT count(*) FROM t1;
227 PRAGMA integrity_check
232 # If a connection running in persistent-journal mode is part of a
233 # multi-file transaction, it must ensure that the master-journal name
234 # appended to the journal file contents during the commit is located
235 # at the end of the physical journal file. If there was already a
236 # large journal file allocated at the start of the transaction, this
237 # may mean truncating the file so that the master journal name really
238 # is at the physical end of the file.
240 # This block of tests test that SQLite correctly truncates such
241 # journal files, and that the results behave correctly if a hot-journal
250 PRAGMA journal_mode = persist;
251 CREATE TABLE ab(a, b);
252 INSERT INTO ab VALUES(0, 'abc');
253 INSERT INTO ab VALUES(1, NULL);
254 INSERT INTO ab VALUES(2, NULL);
255 INSERT INTO ab VALUES(3, NULL);
256 INSERT INTO ab VALUES(4, NULL);
257 INSERT INTO ab VALUES(5, NULL);
258 INSERT INTO ab VALUES(6, NULL);
259 UPDATE ab SET b = randstr(1000,1000);
260 ATTACH 'test2.db' AS aux;
261 PRAGMA aux.journal_mode = persist;
262 CREATE TABLE aux.ab(a, b);
263 INSERT INTO aux.ab SELECT * FROM main.ab;
265 UPDATE aux.ab SET b = randstr(1000,1000) WHERE a>=1;
266 UPDATE ab SET b = randstr(1000,1000) WHERE a>=1;
268 list [file exists test.db-journal] [file exists test2.db-journal]
274 UPDATE aux.ab SET b = 'def' WHERE a = 0;
275 UPDATE main.ab SET b = 'def' WHERE a = 0;
282 UPDATE aux.ab SET b = randstr(1000,1000) WHERE a>=1;
283 UPDATE ab SET b = randstr(1000,1000) WHERE a>=1;
287 set contents_main [db eval {SELECT b FROM main.ab WHERE a = 1}]
288 set contents_aux [db eval {SELECT b FROM aux.ab WHERE a = 1}]
291 crashsql -file test2.db -delay 1 {
292 ATTACH 'test2.db' AS aux;
294 UPDATE aux.ab SET b = 'ghi' WHERE a = 0;
295 UPDATE main.ab SET b = 'ghi' WHERE a = 0;
298 } {1 {child process exited abnormally}}
301 list [file exists test.db-journal] [file exists test2.db-journal]
306 SELECT b FROM main.ab WHERE a = 0;
307 SELECT b FROM aux.ab WHERE a = 0;
312 crashsql -file test2.db -delay 1 {
313 ATTACH 'test2.db' AS aux;
315 UPDATE aux.ab SET b = 'jkl' WHERE a = 0;
316 UPDATE main.ab SET b = 'jkl' WHERE a = 0;
319 } {1 {child process exited abnormally}}
322 set fd [open test.db-journal]
323 fconfigure $fd -translation binary
325 binary scan [read $fd 4] I len
327 seek $fd [expr {-1 * ($len + 16)}] end
328 set zMasterJournal [read $fd $len]
331 file exists $zMasterJournal
335 execsql { SELECT b FROM aux.ab WHERE a = 0 }
338 do_test crash8-4.10 {
339 delete_file $zMasterJournal
340 execsql { SELECT b FROM main.ab WHERE a = 0 }
345 # Since the following tests (crash8-5.*) rely upon being able
346 # to copy a file while open, they will not work on Windows.
348 if {$::tcl_platform(platform)=="unix"} {
349 for {set i 1} {$i < 10} {incr i} {
351 forcedelete test.db test.db-journal
353 do_test crash8-5.$i.1 {
355 CREATE TABLE t1(x PRIMARY KEY);
356 INSERT INTO t1 VALUES(randomblob(900));
357 INSERT INTO t1 SELECT randomblob(900) FROM t1;
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; /* 64 rows */
364 crashsql -file test.db -delay [expr ($::i%2) + 1] {
365 PRAGMA cache_size = 10;
367 UPDATE t1 SET x = randomblob(900);
369 INSERT INTO t1 VALUES(randomblob(900));
371 execsql { PRAGMA integrity_check }
375 forcedelete test.db test.db-journal
377 do_test crash8-5.$i.2 {
379 PRAGMA cache_size = 10;
380 CREATE TABLE t1(x PRIMARY KEY);
381 INSERT INTO t1 VALUES(randomblob(900));
382 INSERT INTO t1 SELECT randomblob(900) FROM t1;
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; /* 64 rows */
389 UPDATE t1 SET x = randomblob(900);
391 forcedelete testX.db testX.db-journal testX.db-wal
392 forcecopy test.db testX.db
393 forcecopy test.db-journal testX.db-journal
396 crashsql -file test.db -delay [expr ($::i%2) + 1] {
397 SELECT * FROM sqlite_master;
398 INSERT INTO t1 VALUES(randomblob(900));
402 execsql { PRAGMA integrity_check } db2