mirror of
https://github.com/sqlite/sqlite.git
synced 2024-12-01 17:23:42 +01:00
5822d6feb2
wherecosttest tool. Other fixes to logarithm cost. FossilOrigin-Name: aa580e368e3c398b8377b80342dfdd906324c248
99 lines
3.6 KiB
Plaintext
99 lines
3.6 KiB
Plaintext
# 2010 May 25
|
|
#
|
|
# 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.
|
|
#
|
|
#***********************************************************************
|
|
#
|
|
|
|
|
|
set testdir [file dirname $argv0]
|
|
source $testdir/tester.tcl
|
|
source $testdir/lock_common.tcl
|
|
source $testdir/wal_common.tcl
|
|
ifcapable !wal {finish_test ; return }
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
# This test case demonstrates a flaw in the wal-index manipulation that
|
|
# existed at one point: If a process crashes mid-transaction, it may have
|
|
# already added some entries to one of the hash-tables in the wal-index.
|
|
# If the transaction were to be explicitly rolled back at this point, the
|
|
# hash-table entries would be removed as part of the rollback. However,
|
|
# if the process crashes, the transaction is implicitly rolled back and
|
|
# the rogue entries remain in the hash table.
|
|
#
|
|
# Normally, this causes no problem - readers can tell the difference
|
|
# between committed and uncommitted entries in the hash table. However,
|
|
# if it happens often enough that all slots in the hash-table become
|
|
# non-zero, the next process that attempts to read or write the hash
|
|
# table falls into an infinite loop.
|
|
#
|
|
# Even if run with an SQLite version affected by the bug, this test case
|
|
# only goes into an infinite loop if SQLite is compiled without SQLITE_DEBUG
|
|
# defined. If SQLITE_DEBUG is defined, the program is halted by a failing
|
|
# assert() before entering the infinite loop.
|
|
#
|
|
# walcrash2-1.1: Create a database. Commit a transaction that adds 8 frames
|
|
# to the WAL (and 8 entry to the first hash-table in the
|
|
# wal-index).
|
|
#
|
|
# walcrash2-1.2: Have an external process open a transaction, add 8 entries
|
|
# to the wal-index hash-table, then crash. Repeat this 1023
|
|
# times (so that the wal-index contains 8192 entries - all
|
|
# slots are non-zero).
|
|
#
|
|
# walcrash2-1.3: Using a new database connection, attempt to query the
|
|
# database. This should cause the process to go into the
|
|
# infinite loop.
|
|
#
|
|
do_test walcrash2-1.1 {
|
|
execsql {
|
|
PRAGMA page_size = 1024;
|
|
PRAGMA auto_vacuum = off;
|
|
PRAGMA journal_mode = WAL;
|
|
PRAGMA synchronous = NORMAL;
|
|
BEGIN;
|
|
CREATE TABLE t1(x);
|
|
CREATE TABLE t2(x);
|
|
CREATE TABLE t3(x);
|
|
CREATE TABLE t4(x);
|
|
CREATE TABLE t5(x);
|
|
CREATE TABLE t6(x);
|
|
CREATE TABLE t7(x);
|
|
COMMIT;
|
|
}
|
|
file size test.db-wal
|
|
} [wal_file_size 8 1024]
|
|
for {set nEntry 8} {$nEntry < 8192} {incr nEntry 8} {
|
|
do_test walcrash2-1.2.[expr $nEntry/8] {
|
|
set C [launch_testfixture]
|
|
testfixture $C {
|
|
sqlite3 db test.db
|
|
db eval {
|
|
PRAGMA cache_size = 15;
|
|
BEGIN;
|
|
INSERT INTO t1 VALUES(randomblob(900)); -- 1 row, 1 page
|
|
INSERT INTO t1 SELECT * FROM t1; -- 2 rows, 3 pages
|
|
INSERT INTO t1 SELECT * FROM t1; -- 4 rows, 5 pages
|
|
INSERT INTO t1 SELECT * FROM t1; -- 8 rows, 9 pages
|
|
INSERT INTO t1 SELECT * FROM t1; -- 16 rows, 17 pages
|
|
INSERT INTO t1 SELECT * FROM t1 LIMIT 3; -- 20 rows, 20 pages
|
|
}
|
|
}
|
|
close $C
|
|
file size test.db-wal
|
|
} [wal_file_size 16 1024]
|
|
}
|
|
do_test walcrash2-1.3 {
|
|
sqlite3 db2 test.db
|
|
execsql { SELECT count(*) FROM t1 } db2
|
|
} {0}
|
|
catch { db2 close }
|
|
|
|
finish_test
|