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Change the log file format to include a small (12 byte) header at the start of the file.

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FossilOrigin-Name: 9865d14d6041874bc1239ce7a061d5c75f2d33c9
This commit is contained in:
dan
2010-04-16 13:59:31 +00:00
parent 4a4b01dc1c
commit 97a313554d
4 changed files with 120 additions and 76 deletions
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test/wal.test
+29 -23
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@@ -28,6 +28,10 @@ proc sqlite3_wal {args} {
[lindex $args 0] eval { PRAGMA journal_mode = wal }
}
proc log_file_size {nFrame pgsz} {
expr {12 + ($pgsz+16)*$nFrame}
}
#
# These are 'warm-body' tests used while developing the WAL code. They
# serve to prove that a few really simple cases work:
@@ -58,7 +62,7 @@ do_test wal-1.1 {
do_test wal-1.2 {
# There are now two pages in the log.
file size test.db-wal
} [expr (20+1024)*2]
} [log_file_size 2 1024]
do_test wal-1.3 {
execsql { SELECT * FROM sqlite_master }
@@ -208,11 +212,11 @@ do_test wal-7.1 {
INSERT INTO t1 VALUES(1, 2);
}
list [file size test.db] [file size test.db-wal]
} [list 0 [expr (1024+20)*3]]
} [list 0 [log_file_size 3 1024]]
do_test wal-7.2 {
execsql { PRAGMA checkpoint }
list [file size test.db] [file size test.db-wal]
} [list 2048 [expr (1024+20)*3]]
} [list 2048 [log_file_size 3 1024]]
# Execute some transactions in auto-vacuum mode to test database file
# truncation.
@@ -547,12 +551,12 @@ do_test wal-11.1 {
} {0 3}
do_test wal-11.2 {
execsql { PRAGMA checkpoint }
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {3 3}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 3 [log_file_size 3 1024]]
do_test wal-11.3 {
execsql { INSERT INTO t1 VALUES( randomblob(900) ) }
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {3 4}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 3 [log_file_size 4 1024]]
do_test wal-11.4 {
execsql {
@@ -562,8 +566,8 @@ do_test wal-11.4 {
INSERT INTO t1 SELECT randomblob(900) FROM t1; -- 8
INSERT INTO t1 SELECT randomblob(900) FROM t1; -- 16
}
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {3 33}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 3 [log_file_size 33 1024]]
do_test wal-11.5 {
execsql {
SELECT count(*) FROM t1;
@@ -572,8 +576,8 @@ do_test wal-11.5 {
} {16 ok}
do_test wal-11.6 {
execsql COMMIT
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {3 42}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 3 [log_file_size 42 1024]]
do_test wal-11.7 {
execsql {
SELECT count(*) FROM t1;
@@ -582,12 +586,12 @@ do_test wal-11.7 {
} {16 ok}
do_test wal-11.8 {
execsql { PRAGMA checkpoint }
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {37 42}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 37 [log_file_size 42 1024]]
do_test wal-11.9 {
db close
sqlite3_wal db test.db
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
list [expr [file size test.db]/1024] [file size test.db-wal]
} {37 0}
do_test wal-11.10 {
@@ -597,8 +601,8 @@ do_test wal-11.10 {
INSERT INTO t1 SELECT randomblob(900) FROM t1; -- 32
SELECT count(*) FROM t1;
}
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {37 38}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 37 [log_file_size 40 1024]]
do_test wal-11.11 {
execsql {
SELECT count(*) FROM t1;
@@ -607,8 +611,8 @@ do_test wal-11.11 {
}
} {32 16}
do_test wal-11.12 {
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {37 38}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 37 [log_file_size 40 1024]]
do_test wal-11.13 {
execsql {
INSERT INTO t1 VALUES( randomblob(900) );
@@ -617,12 +621,14 @@ do_test wal-11.13 {
}
} {17 ok}
do_test wal-11.14 {
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {37 38}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 37 [log_file_size 40 1024]]
#-------------------------------------------------------------------------
# This block of tests, wal-12.*, tests a problem...
# This block of tests, wal-12.*, tests the fix for a problem that
# could occur if a log that is a prefix of an older log is written
# into a reused log file.
#
reopen_db
do_test wal-12.1 {
@@ -632,8 +638,8 @@ do_test wal-12.1 {
CREATE TABLE t2(x, y);
INSERT INTO t1 VALUES('A', 1);
}
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {0 5}
list [expr [file size test.db]/1024] [file size test.db-wal]
} [list 0 [log_file_size 5 1024]]
do_test wal-12.2 {
db close
sqlite3_wal db test.db