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Overview
| Comment: | When moving a page to make way for the root page of a new table or index in an auto-vacuum database, save the positions of any cursors that may be holding xFetch references to the page being moved. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | experimental-mmap |
| Files: | files | file ages | folders |
| SHA1: |
9d9b1da54a555e8fb6037d63d1952458 |
| User & Date: | dan 2013-04-03 11:38:36 |
Context
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2013-04-03
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| 11:52 | Remove the restriction on using xFetch to load the root pages of tables and indexes. It appears to have been based on a misconception. check-in: 5b082efe user: dan tags: experimental-mmap | |
| 11:38 | When moving a page to make way for the root page of a new table or index in an auto-vacuum database, save the positions of any cursors that may be holding xFetch references to the page being moved. check-in: 9d9b1da5 user: dan tags: experimental-mmap | |
| 11:17 | In btree.c, save the positions of other cursors open on the same table when writing via an incremental blob handle. Otherwise, they may be left holding an out-of-date xFetch page reference. check-in: 3f09fba1 user: dan tags: experimental-mmap | |
Changes
Changes to src/btree.c.
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** the new table (assuming an error did not occur). But we were
** allocated pgnoMove. If required (i.e. if it was not allocated
** by extending the file), the current page at position pgnoMove
** is already journaled.
*/
u8 eType = 0;
Pgno iPtrPage = 0;
releasePage(pPageMove);
/* Move the page currently at pgnoRoot to pgnoMove. */
rc = btreeGetPage(pBt, pgnoRoot, &pRoot, 0, 0);
if( rc!=SQLITE_OK ){
return rc;
|
> > > > > > > > |
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** the new table (assuming an error did not occur). But we were
** allocated pgnoMove. If required (i.e. if it was not allocated
** by extending the file), the current page at position pgnoMove
** is already journaled.
*/
u8 eType = 0;
Pgno iPtrPage = 0;
/* Save the positions of any open cursors. This is required in
** case they are holding a reference to an xFetch reference
** corresponding to page pgnoRoot. */
rc = saveAllCursors(pBt, 0, 0);
if( rc!=SQLITE_OK ){
return rc;
}
releasePage(pPageMove);
/* Move the page currently at pgnoRoot to pgnoMove. */
rc = btreeGetPage(pBt, pgnoRoot, &pRoot, 0, 0);
if( rc!=SQLITE_OK ){
return rc;
|
Changes to test/mmap1.test.
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do_test 4.4 {
sqlite3_finalize $::STMT
} SQLITE_OK
do_execsql_test 4.5 { COMMIT }
finish_test
|
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do_test 4.4 {
sqlite3_finalize $::STMT
} SQLITE_OK
do_execsql_test 4.5 { COMMIT }
#-------------------------------------------------------------------------
# Ensure that existing cursors holding xFetch() references are not
# confused if those pages are moved to make way for the root page of a
# new table or index.
#
reset_db
do_execsql_test 5.1 {
PRAGMA auto_vacuum = 2;
PRAGMA page_size = 1024;
CREATE TABLE t1(x);
INSERT INTO t1 VALUES($aaa);
INSERT INTO t1 VALUES($bbb);
INSERT INTO t1 VALUES($ccc);
INSERT INTO t1 VALUES($ddd);
PRAGMA auto_vacuum;
SELECT * FROM t1;
} [list 2 $aaa $bbb $ccc $ddd]
do_test 5.2 {
set ::STMT [sqlite3_prepare db "SELECT * FROM t1 ORDER BY rowid" -1 dummy]
sqlite3_step $::STMT
sqlite3_column_text $::STMT 0
} $aaa
do_execsql_test 5.3 {
CREATE TABLE t2(x);
INSERT INTO t2 VALUES('tricked you!');
INSERT INTO t2 VALUES('tricked you!');
}
do_test 5.4 {
sqlite3_step $::STMT
sqlite3_column_text $::STMT 0
} $bbb
do_test 5.5 {
sqlite3_finalize $::STMT
} SQLITE_OK
finish_test
|