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Allow writers to write dirty pages to the log mid-transaction in order to free memory.

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FossilOrigin-Name: ecd828f96909895535d7dc744e5a8530e234e04d
This commit is contained in:
dan
2010-04-15 16:45:34 +00:00
parent bb2e9c97fc
commit 4cc6fb6165
4 changed files with 170 additions and 76 deletions
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90
test/wal.test
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@ -531,5 +531,95 @@ foreach code [list {
catch { close $::code3_chan }
}
#-------------------------------------------------------------------------
# This block of tests, wal-11.*, test that nothing goes terribly wrong
# if frames must be written to the log file before a transaction is
# committed (in order to free up memory).
#
do_test wal-11.1 {
reopen_db
execsql {
PRAGMA cache_size = 10;
PRAGMA page_size = 1024;
CREATE TABLE t1(x PRIMARY KEY);
}
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {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}
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}
do_test wal-11.4 {
execsql {
BEGIN;
INSERT INTO t1 SELECT randomblob(900) FROM t1; -- 2
INSERT INTO t1 SELECT randomblob(900) FROM t1; -- 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}
do_test wal-11.5 {
execsql {
SELECT count(*) FROM t1;
PRAGMA integrity_check;
}
} {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}
do_test wal-11.7 {
execsql {
SELECT count(*) FROM t1;
PRAGMA integrity_check;
}
} {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}
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]
} {37 0}
do_test wal-11.10 {
execsql {
PRAGMA cache_size = 10;
BEGIN;
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}
do_test wal-11.11 {
execsql {
SELECT count(*) FROM t1;
ROLLBACK;
SELECT count(*) FROM t1;
}
} {32 16}
do_test wal-11.12 {
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {37 38}
do_test wal-11.13 {
execsql {
INSERT INTO t1 VALUES( randomblob(900) );
SELECT count(*) FROM t1;
PRAGMA integrity_check;
}
} {17 ok}
do_test wal-11.14 {
list [expr [file size test.db]/1024] [expr [file size test.db-wal]/1044]
} {37 38}
finish_test