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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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100 ancestors of [27a5c09c]

2010-05-03
14:05
If the sqlite3_wal_checkpoint() API is passed a NULL pointer in place of a database name, attempt to checkpoint all attached databases. Closed-Leaf check-in: 27a5c09c user: dan tags: wal
13:37
Make sure the mutex is held while calling sqlite3ApiExit() in sqlite3_wal_checkpoint(). Other cleanup of WAL logic. check-in: 11a85b82 user: drh tags: wal
12:14
Have sqlite3_wal_checkpoint() populate the database handle error message and error code (as returned by sqlite3_errmsg() and sqlite3_errcode()). check-in: ff234cf5 user: dan tags: wal
11:05
Add the "PRAGMA wal_autocheckpoint" command. Rename "PRAGMA checkpoint" to "PRAGMA wal_checkpoint". check-in: 714e5947 user: dan tags: wal
08:19
Merge two wal leaves. check-in: 23c0e6c3 user: dan tags: wal
08:04
Add the sqlite3_wal_checkpoint() and sqlite3_wal_autocheckpoint() APIs. check-in: 9803196d user: dan tags: wal
2010-05-01
20:17
Change the SHM interface so that it does not take the name of the shared object but rather the name of the WAL file and derives its own name from that. Remove the xShmDelete method from the VFS and replace it with a delete flag on xShmClose. check-in: 94dea5f9 user: drh tags: wal
18:23
Remove the xShmPush and xShmPull methods from the VFS. check-in: 69e07fdb user: drh tags: wal
17:57
Define an invariant to guarantee deadlock-free operation of SHM in os_unix.c and check that invariant with assert() statements. check-in: 6af2dca7 user: drh tags: wal
17:50
Rework mutexes on the SHM implemention for os_unix to avoid a deadlock during WAL recovery. check-in: 1a0f69be user: drh tags: wal
16:40
Support compile-time option SQLITE_OMIT_WAL, for building without WAL support. check-in: 9b230c43 user: dan tags: wal
11:33
Fix a typo in the walmode.test test script introducted yesterday. check-in: dcabc90c user: drh tags: wal
11:19
Fix the sqlite3_mutex_alloc() interface to return NULL (not segfault) when operating in threadsafe mode. (This is a general-purpose bug fix which really ought to be ported to trunk.) check-in: 64840a3c user: drh tags: wal
08:30
Add test case demonstrating deadlock during recovery of very large log files. No fix yet. check-in: 63ea318e user: dan tags: wal
00:59
Do not allow journal_mode=WAL if the underlying VFS does not support xShmOpen. check-in: d1fcccec user: drh tags: wal
2010-04-30
22:28
Merge in changes from the trunk. check-in: 76bf0eee user: drh tags: wal
21:03
Avoid assertion faults in queries using indices with redundant columns. Ticket [3dbdcdb14e7f41]. check-in: 946e06cd user: drh tags: trunk
17:47
Change the SHM VFS logic in os_unix.c so that it does not hold an exclusive lock n the mapped memory when also holding a CHECKPOINT lock. This improves concurrency between readers and checkpointers. check-in: 8660cda6 user: drh tags: wal
17:28
Remove some obsolete debugging parameters. check-in: a012aed4 user: drh tags: wal
17:05
Fix a problem with resizing the wal-index mapping after the mapping has been extended by an external process. check-in: 79d356fe user: dan tags: wal
16:50
Fix a problem with calculating the required size of the wal-index when appending frames. check-in: 9526b111 user: dan tags: wal
16:48
In the debugging output for SHM-LOCK in os_unix.c, use symbolic names for the lock states rather than raw numbers. check-in: 2afc33de user: drh tags: wal
16:41
Fix a problem in the previous commit. Both unixShm.lockState and unixShm.readLock should be set to READ when downgrading from a WRITE to a READ lock check-in: 90119fec user: dan tags: wal
16:38
Fix a bug whereby upgrading from a READ_FULL to a WRITE lock, and then back to a read lock was dropping all WAL locks. check-in: 55f5af5e user: dan tags: wal
16:24
Reapply commits [837d82a929] and [c05e7dca17] that were accidentally overwritten. check-in: 598de527 user: dan tags: wal
16:19
Add xShmXXX() methods to the test VFS in test_devsym.test. check-in: 1d203424 user: dan tags: wal
16:12
Correctly record the fact that the SHM lock reached PENDING if it did so but failed to reach CHECKPOINT. check-in: d9250e84 user: drh tags: wal
15:54
Fix a couple uninitialized variables in the xShmLock method of the unix VFS. Improved debugging logic for xShmLock. check-in: 69567c5f user: drh tags: wal
15:49
When closing a WAL connection, attempt an exclusive lock on the database file. If the lock is obtained, checkpoint the database and delete the wal and wal-index files. check-in: c05e7dca user: dan tags: wal
15:24
If a reader attempts to upgrade to a writer, but is not reading the most recent database snapshot, return SQLITE_BUSY. check-in: 837d82a9 user: dan tags: wal
14:39
Separate the concepts of underlying storage size and mapped size in the VFS shared-memory implementation. check-in: 4cbe49f1 user: drh tags: wal
11:43
Add a missing walIndexUnmap() call to the checkpoint code. Change a couple of SQLITE_CANTOPEN constants to SQLITE_CANTOPEN_BKPT. check-in: 1f9e8c5c user: dan tags: wal
10:24
Fix an assert() in sqlite3WalRead(). check-in: 2e7a0050 user: dan tags: wal
10:06
Add missing mutexes to unixShmClose(). check-in: a4741cb5 user: dan tags: wal
09:52
Fix a couple of assert() statements in os_unix.c and wal.c. Combine sqlite3WalIsDirty() with sqlite3WalUndo(). check-in: a8f958be user: dan tags: wal
09:32
Add a missing walIndexUnmap() to sqlite3WalSnapshotOpen(). check-in: 72b95fde user: dan tags: wal
06:02
Merge latest bugfix into wal branch. check-in: 265e66e6 user: dan tags: wal
05:57
Zero the "immediate FK constraint counter" associated with a statement object when sqlite3_reset() is called. Fix for [c39ff61c43]. check-in: f660be61 user: dan tags: trunk
02:13
The first 6 WAL tests now work. It's a start. check-in: a92c1851 user: drh tags: wal
2010-04-29
22:34
Refactor wal.c to use the VFS. This check-in compiles and links and works ok as long as you leave WAL turned off, but WAL does not work. check-in: 62db5fa3 user: drh tags: wal
16:40
Untested implementation of the shared-memory dead-man-switch. check-in: 70661128 user: drh tags: wal
15:17
Progress towards a VFS that will support WAL. Locking code is in place but is untested. Still no support for the DMS. check-in: 1bde41cf user: drh tags: wal
14:58
Close all open database connections at the end of wal.test. check-in: 3cc55a75 user: dan tags: wal
14:51
Fix a bug in the WAL checkpoint code causing SQLite to use an inconsistent cache in a subsequent transaction. check-in: d1cadeed user: dan tags: wal
08:47
Add tests to walthread.test. check-in: 9e891e75 user: dan tags: wal
2010-04-28
18:17
Add a test to walthread.test for changing between WAL and rollback modes. check-in: da229e44 user: dan tags: wal
17:49
Merge two "wal" leaves. check-in: 13d2d5a6 user: dan tags: wal
17:48
Change walthread.test so that tests can be run with either multiple threads or multiple processes. check-in: 25f85f68 user: dan tags: wal
17:21
Changes to the interface design for the xShmLock method of the VFS. check-in: 348409de user: drh tags: wal
14:42
Rename the sqlite3_log_hook() to sqlite3_wal_hook(). Added comments to wal.h. check-in: bbc38511 user: drh tags: wal
2010-04-27
18:49
Merge two "wal" leaves. check-in: 8c2d43ba user: dan tags: wal
18:43
Add a test to check that a checkpointer releases its locks before returning, even if it has been prevented by a conflicting lock from checkpointing the database. check-in: be44349d user: dan tags: wal
14:37
Fix a problem with identifying a corrupt database in WAL mode. check-in: c8658da4 user: dan tags: wal
11:49
Add the xShmRelease() method to the VFS. The os_unix.c implementation of the shared memory logic is still non-functional. check-in: ed715b47 user: drh tags: wal
06:49
Run trans.test and avtrans.test as part of the "wal" permutation. check-in: c8893310 user: dan tags: wal
05:42
Fix a problem that occurs when one process causes the log-summary file to grow and then a second process attempts to read the database. check-in: b51a5f8b user: dan tags: wal
01:56
Merge in recent changes from the trunk check-in: 7a0ac682 user: drh tags: wal
2010-04-26
19:17
Optimization: Convert an ORDER BY clause into a no-op if the query also contains a GROUP BY clause that will force the same output order. check-in: ca9d86ba user: drh tags: trunk
17:42
Do not attempt to set journal_mode=wal on :memory: or temp file databases. check-in: 30d01344 user: dan tags: wal
17:36
Change the default_cache_size pragma to always store a positive value. check-in: 36fb2cae user: drh tags: trunk
17:30
Identify the SQLite version meta-value entry in the db-header output of showdb. check-in: 245d934b user: drh tags: trunk
16:57
Fixes for problems with small caches and SAVEPOINT rollback in WAL mode. check-in: 6a944f02 user: dan tags: wal
16:47
Further enhancements to the showdb utility: A page number followed by "b" causes a btree decoding to occur on the page. check-in: 2ff824e5 user: drh tags: trunk
15:44
Enhancements to the showdb.c utility program. Automatically detect the page size and adjust the display accordingly. Add the "dbheader" display option. check-in: 23eb408b user: drh tags: trunk
12:39
Add the "wal" permutation to run existing test files savepoint.test and savepoint2.test in WAL mode. check-in: 205e5d8a user: dan tags: wal
10:40
Add mutexes to fix a race condition in wal.c. This isn't a very good fix. check-in: 3d159939 user: dan tags: wal
00:19
Change the names of the log.c and log.h source files to wal.c and wal.h. check-in: 56fe5d76 user: drh tags: wal
00:04
Begin moving WAL-specific I/O into the VFS. This checkin contains VFS infrastructure but it is untested and is not yet hooked up to the WAL. The version number is bumped to 3.7.0 because of the VFS extension. check-in: f5e615c2 user: drh tags: wal
2010-04-25
20:58
Remove an unreachable branch from the function initialization logic. check-in: 064d3ddd user: drh tags: trunk
2010-04-24
19:07
Add comment explaining checksum mechanism. check-in: 3e9ef515 user: dan tags: wal
18:44
Fix bugs in WAL mode rollback. check-in: 31215969 user: dan tags: wal
14:33
Merge with [0291ed974d]. Merge with [0291ed974d]. Merge with [0291ed974d]. check-in: a352f628 user: dan tags: wal
14:02
When commands such as ALTER TABLE and VACUUM use SQL internally, make sure they use only the built-in functions and not application-defined overrides for those functions. check-in: 0291ed97 user: drh tags: trunk
04:53
Merge with [e79dac3c2f]. check-in: 1e793d3a user: dan tags: wal
04:49
Reserve some space at the start of the log-summary file to apply locks to. check-in: a031aa1f user: dan tags: wal
2010-04-23
19:15
Fixes and tests for backup of a WAL database. check-in: 480d12db user: dan tags: wal
14:29
Merge of notify.c changes from experimental. Reset stored blocking connection when registered unlock_notify callback is cleared. check-in: e79dac3c user: shaneh tags: trunk
11:44
Add very simple test cases for backup and VACUUM of WAL databases. More to come. check-in: 1077d813 user: dan tags: wal
2010-04-22
19:14
Create a version of the log checksummer that works on big-endian platforms. Remove the 512KB size limit on the log-summary. check-in: 5d6d4423 user: dan tags: wal
06:27
Further tests and changes related to switching between WAL and rollback modes. check-in: 12363184 user: dan tags: wal
2010-04-21
18:37
Tests for (and changes to) the code to switch between WAL and rollback modes. check-in: 9f4f933f user: dan tags: wal
11:43
If, after obtaining a SHARED lock, there exists a *-wal file in the file-system, use WAL mode. This is necessary to recover from a crash that damages the first page of the database file. check-in: 33cabf27 user: dan tags: wal
06:19
Minor changes to test cases to account for the fact that databases with read/write versions of 2 are now understood. check-in: 278ed41e user: dan tags: wal
2010-04-20
18:53
Use the read and write version fields of the database header to mark a database as operating in wal-mode. check-in: 96bef18c user: dan tags: wal
2010-04-19
18:03
Add the sqlite3_log_hook() interface for scheduling checkpoints. check-in: 9bda6014 user: dan tags: wal
2010-04-17
18:50
Add some comments regarding file-locks to log.c. check-in: 9d51c3b7 user: dan tags: wal
17:34
Do not sync any files in wal mode if "PRAGMA synchronous=off" is set. If files are synced, pass either SQLITE_SYNC_FULL or SQLITE_SYNC_NORMAL to the xSync() callback as configured by "PRAGMA fullfsync". check-in: 0ae91b00 user: dan tags: wal
16:10
It is possible for sqlite3.pUnlockConnection to be non-NULL when sqlite3.pBlockingConnection is NULL, as the notify1.test script demonstrates. Closed-Leaf check-in: 95ff76ef user: drh tags: experimental
15:45
Merge with trunk commit [3e646e3f4c]. check-in: 43463970 user: dan tags: wal
15:42
In synchronous=normal mode, do not sync the log after every transaction. In synchronous=full mode, sync the log and add any extra frames required to avoid blast-radius related problems after each transaction. check-in: 9bc9b684 user: dan tags: wal
12:53
Change sqlite3_step() so that it automatically calls sqlite3_reset() instead of returning SQLITE_MISUSE when invoked on a prepared statement that previously returned any value other than SQLITE_ROW. check-in: 3e646e3f user: drh tags: trunk
12:31
Enhancements to wal-mode locking scheme. check-in: 8549c286 user: dan tags: wal
2010-04-16
22:05
Changes for branch coverage of notify.c. Fixed quirk of unlock_notify() where it would still think it was blocked after a callback was cleared (even after the transaction on the blocking connection was closed). check-in: c54e8dad user: shaneh tags: experimental
13:59
Change the log file format to include a small (12 byte) header at the start of the file. check-in: 9865d14d user: dan tags: wal
11:30
Fix bug in log recovery (last frame in log was being ignored). Also remove an incorrect assert statement. check-in: 67d2a89e user: dan tags: wal
2010-04-15
23:24
Disable query flattening when the outer query is a compound SELECT and the inner query has a LIMIT clause. Ticket [02a8e81d44]. check-in: f96782b3 user: drh tags: trunk
16:45
Allow writers to write dirty pages to the log mid-transaction in order to free memory. check-in: ecd828f9 user: dan tags: wal
13:33
Merge two leaves on the WAL branch. check-in: c9ed66cc user: dan tags: wal
13:29
The query planner fix of check-in [33b1f584ef] should have been on the trunk. check-in: f538d759 user: drh tags: trunk
12:36
Fix a problem in the result set size estimation logic of the query planner - a problem introduced by the two previous changes. check-in: 33b1f584 user: drh tags: wal
10:58
Change the way checksums are calculated. check-in: 84955c2e user: dan tags: wal