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Commit Graph

1354 Commits

Author SHA1 Message Date
drh
f38dd3b68f Minor size and performance optimization to sqlite3BtreeCloseCursor(). 
FossilOrigin-Name: 16969338841734d00ab906a94b82480c7e1e426eb0ddf7b9e6aed722aee5d91f
 2017-08-14 23:53:02 +00:00
drh
44548e7218 Change the internal btree routine moveToRoot() to return SQLITE_EMPTY if 
the table is empty or if it has pgnoRoot==0.  This simplifies the callers,
making them smaller and faster.  The SQLITE_EMPTY result code is intercepted
and changed into SQLITE_OK before surfacing in an API.

FossilOrigin-Name: 240d57143d943eaddd5f7c2d473f47a1d29417e61d28142f70f3d960bb9b30df
 2017-08-14 18:13:52 +00:00
drh
f0357d8b2c Fix harmless indentation error. 
FossilOrigin-Name: 25e92baaaeb9e8a2650b3083d3febf3661ecf1e05d9d24b26fe9f87a03bdd8fa
 2017-08-14 17:03:58 +00:00
drh
60172a5a93 Minor optimization on clearCell() 
FossilOrigin-Name: f3c39c2986be08683c2af4df610bc12e3c6bc6bec265c94ce01b94a950723524
 2017-08-02 18:27:50 +00:00
drh
85ef630fde Optimizations associated with error handling in btree cursors. 
FossilOrigin-Name: 49ba54e26731ed371745d4bdd9dd1dfeb73357b6d206c85a4252ec866be971d0
 2017-08-02 15:50:09 +00:00
drh
8999798e60 Fix harmless compiler warnings in the core. 
FossilOrigin-Name: 55e93f256018757e5e1cb3b10ef48abf5914e7687419eae58b00998a37061261
 2017-07-11 18:11:33 +00:00
drh
08f1efeb16 Add the "PRAGMA secure_delete=FAST" option, which overwrites most deleted 
content without increasing the amount of I/O.  Deleted content might persist
on the free page list, however.  And extra CPU cycles are used for zeroing,
of course.

FossilOrigin-Name: 38978ce65b280bb7cba3fc08ba91485fb1b84cd9fbba2e950ecf41c021ff452a
 2017-07-07 20:06:28 +00:00
drh
169dd928c5 Add the SQLITE_DBCONFIG_ENABLE_QPSG option to activate the query planner 
stability guarantee.  This involves refactoring the sqlite3.flags bitvector
to carve out a free bit to use.

FossilOrigin-Name: 7076e8283ebae1b45a5d85d9538b49b6da399d38c3c6935de100f948f814f6a9
 2017-06-26 13:57:49 +00:00
drh
a5907a86b8 Experimental "PRAGMA secure_delete=FAST" pragma. The intent is to overwrite 
deleted content with zeros without increasing the amount of disk I/O.

FossilOrigin-Name: f1682f0faf1a93ded066464b1ddd5f987e21ee0f6bb5e828ed31c3ad903cf2c3
 2017-06-19 11:44:22 +00:00
drh
c62aab5ba8 Fix a potential null-pointer deference following OOM introduced by 
check-in [e39795d7] (unreleased).

FossilOrigin-Name: a2f77285fa44df86863eed576271f1030ec60f15480daf175908c5082c27774b
 2017-06-11 18:26:15 +00:00
dan
ca66f6c6f4 Ensure pointer map entries are always added when a row that does use overflow 
pages replaces one that does not in an auto-vacuum database. Fix for
[fda22108].

FossilOrigin-Name: b30dfba811cb531b09ff2e71a1a18ed53c816cb39155dd52ca3e2701425fe17b
 2017-06-08 11:14:08 +00:00
drh
cc97ca4c08 In SQLITE_DEBUG mode, attempt to log the page number of the database that 
contained the problem when SQLITE_CORRUPT errors are seen.

FossilOrigin-Name: e39795d7d798d5249c7bd2a0f6ff891b455f4300a3d638c39a4668323b367666
 2017-06-07 22:32:59 +00:00
drh
2ab792e4c0 Change sqlite3BtreeNext() and sqlite3BtreePrevious() so that they return 
SQLITE_DONE if they have already reached the end (or beginning) of the table.
This gives a performance increase and size reduction.

FossilOrigin-Name: e972a3860892022d57b26ec44ce0fbadc61c1ff54b7a10b7e82390db88d323a7
 2017-05-30 18:34:07 +00:00
drh
14e845a9d4 Small performance increase and size decrease in the btreeInitPage() routine. 
FossilOrigin-Name: 6f415833e0554706dcf04f68ecba4ca2e54c08f3bbf6a1dba182bb132c912a2e
 2017-05-25 21:35:56 +00:00
dan
4b2667c8b8 Enhance "PRAGMA integrity_check" to detect duplicate rowids within a leaf 
page.

FossilOrigin-Name: adcad37b001d255299be716b16003b56ec1fba349ef73261ee0e543186c4f311
 2017-05-01 18:24:01 +00:00
dan
874080bbb6 Clear the BTCF_ValidNKey flag set if a cursor is moved by 
sqlite3BtreeInsert(). Fix for [f68dc596c4].

FossilOrigin-Name: a6727eef6d757a39ad23e5c8cbe960f5d909e5d37cb4e90bc3bdbb8bf58cd6f8
 2017-05-01 18:12:56 +00:00
dan
a1188d6d93 When building an ephemeral table of integers, do not assume that the table 
does not already contain N if the insert cursor points to N-1. Fix for ticket
[61fe9745].

FossilOrigin-Name: 1c1b0862236f564283be08338790d6494e705f1198547a59499e3f8c07f2cd99
 2017-04-24 14:16:55 +00:00
drh
75e96b3100 Save a 78 bytes of code space and a million CPU cycles in speedtest1 by 
storing the cell index for the leaf page in the BtCursor object in its own
field (BtCursor.ix), rather than as an entry in the BtCursor.aiIdx array.

FossilOrigin-Name: 2452f0617d1085689264b5f66681788cfe9e3b1a7b318307c93942b702a443df
 2017-04-01 00:20:06 +00:00
drh
9ca431aef8 Avoid unnecessary blob handle invalidation when changes are made to an 
unrelated table.

FossilOrigin-Name: 4a01880b62706c12d6f16f7c2b5c8b0dc67a9a8a0a48c5b42451e1a133e85611
 2017-03-29 18:03:50 +00:00
dan
fc8f4b658c Fix a typo causing the build to fail if SQLITE_DEFAULT_SYNCHRONOUS==SQLITE_DEFAULT_WAL_SYNCHRONOUS. 
FossilOrigin-Name: df39adeaa4d73a3d4ec831843b8ec7fd449f8b2137bdc7d7c320958d00e98db6
 2017-03-16 18:54:42 +00:00
dan
f5da7dbb07 If the user has not set it explicitly, set the "PRAGMA synchronous" setting to 
SQLITE_DEFAULT_SYNCHRONOUS when a database connection changes from wal to
rollback journal mode.

FossilOrigin-Name: 78030c0f52aa39fb2ab32c75c56e6bcefe6382b8df28b1909e3c911e42dbeca3
 2017-03-16 18:14:39 +00:00
drh
063d57039e Merge updates from trunk. 
FossilOrigin-Name: 5f7fc79aa06ca9b79664c50c3c277c98a74ff9a0
 2017-03-06 11:39:34 +00:00
dan
30741eb0d3 Fix a case introduced by [4cd2a967] where a corrupt database could cause a buffer overwrite. 
FossilOrigin-Name: 5d0455fece514552ad7f283d56526f53d7c688bd
 2017-03-03 20:02:53 +00:00
drh
8d990b34db Merge recent trunk enhancements. 
FossilOrigin-Name: c60cdb47612c05c252613e50a8ac10635469fdfe
 2017-03-02 13:22:04 +00:00
dan
3b2ede1f03 Tweak the code on this branch to detect b-tree page corruption in the same cases as the trunk. 
FossilOrigin-Name: f9863b39d96dce6cb5e49a5f3a445ff3d897a951
 2017-02-25 16:24:02 +00:00
dan
e6d065a81e Optimize defragmentPage() in the case where the page contains either one or 
two free-blocks and a small number of fragmented bytes.

FossilOrigin-Name: 202b1c0276aec6b8da64d3277de1ad91c9d62d80
 2017-02-24 19:58:22 +00:00
drh
555227bec0 Add two NEVER() operators in the sqlite3BtreeRowCountEst() routine. 
FossilOrigin-Name: 7a959f6d1ea038988cdb4c02d6f37abaec2580a0
 2017-02-23 02:15:33 +00:00
drh
dfe11bae99 Fix errors in the table resize detection. 
FossilOrigin-Name: 4229caec0b60a1617b9d5ff94b47271cbd7be1e0
 2017-02-18 02:42:54 +00:00
drh
5e98e838da The analyze_as_needed pragma now responds to table size growth and will 
automatically rerun the analysis after each 10x size increase.

FossilOrigin-Name: bfbdd07409688fac4ccddbab3639745f6152e23d
 2017-02-17 19:24:06 +00:00
drh
d879e3eb8d Change all legacy instances of "#if SQLITE_DEBUG" to "#ifdef SQLITE_DEBUG" for 
consistency.

FossilOrigin-Name: 670f10b24230863688270d12ac519609ade2302b
 2017-02-13 13:35:55 +00:00
drh
2343c7eb3f This is an experimental patch that ensures that all cursors have their position 
saved prior to starting a ROLLBACK TO.

FossilOrigin-Name: 01d97e5b6502b1811b52a681f445e1aaae6c0ee6
 2017-02-02 00:46:55 +00:00
drh
6ee610bfc0 Another micro-optimization in accessPayload(). Slightly smaller and faster. 
FossilOrigin-Name: c012619b65d70b4ef6cf33532ef57d7f8ba42d74
 2017-01-27 01:25:00 +00:00
drh
cdf360a0d5 Performance optimization in accessPayload(). 
FossilOrigin-Name: ebb1fd98d4e448aa6d8f1e5be7ddc5bedb3db95b
 2017-01-27 01:13:49 +00:00
drh
42e28f12a3 Simplify the accessPayload() routine so that it always populates the overflow 
page cache.  In the one case where populating the page cache can lead to 
problems, simply invalidate the cache as soon as accessPayload() returns.  
This simplification reduces code size and helps accessPayload() to run a 
little faster.  This backs out the eOp==2 mode of accessPayload() added by 
check-in [da59198505].

FossilOrigin-Name: 68e7a8c6765649195ef1ad9407d87d44a307b462
 2017-01-27 00:31:59 +00:00
drh
945b094632 Remove an unreachable branch in the error handling logic for 
sqlite3BtreePayloadChecked().

FossilOrigin-Name: 293bf3ed7e40745349c83b202b27ed1b48517e1a
 2017-01-26 21:30:00 +00:00
drh
83ec2761fa Performance optimization to sqlite3_blob_read(). 
FossilOrigin-Name: 7459f4b7ed4007d9ec44c3bf0fcba04f5f8540a9
 2017-01-26 16:54:47 +00:00
drh
8bb9fd3b45 Minor simplification and performance optimization for Direct Overflow Read. 
FossilOrigin-Name: 3e96d6efa867b765c8acf1454014b1e71b2e4f21
 2017-01-26 16:27:32 +00:00
drh
d930b5cb06 Make SQLITE_DIRECT_OVERFLOW_READ work for in WAL mode as long as the page 
being read is not in the the -wal file.

FossilOrigin-Name: 9879be1899adf5634f551a2077b15ccb1133e4e3
 2017-01-26 02:26:02 +00:00
drh
7f11afaba1 A better implementation of the moveto-neighbor optimization that checks for 
nearby rows on adjacent pages.

FossilOrigin-Name: 2c4ecb85a475b9063aa8a3bb517ac181a7ded649
 2017-01-21 21:47:54 +00:00
drh
451e76d5b5 B-tree optimization: When seeking on a rowid table that has already been 
positioned, check to see if the new row happens to be the next row on the
same leaf page.  That is a reasonably common case, and if it is true it
avoids a full binary search.

FossilOrigin-Name: 8e5cfb2039126da7689c4b1c88760f10e1234eaf
 2017-01-21 16:54:19 +00:00
drh
cd64553015 Minor performance optimization and size reduction to the accessPayload() 
routine in btree.c.

FossilOrigin-Name: 264e5c10d7144910b3223b64546567fa20e4bc65
 2017-01-20 20:43:14 +00:00
drh
7b20a15d13 Remove a branch that is probably unreachable, and which adds no value. 
FossilOrigin-Name: 9acc72381ccd5e36f3ffdf7e7fbefc5a15701eb4
 2017-01-12 19:10:55 +00:00
drh
70d90a2c37 Remove an unnecessary corruption test from the btree balancer. If corruption 
is present, it will be found harmlessly by later tests.

FossilOrigin-Name: bddf39562d08e259c43dd59b82afb62fe0eb2eef
 2017-01-12 16:14:33 +00:00
drh
b701c9a6c3 Improved detection of cells that extend into the reserved space at the end 
of the page while adjusting overflow page pointers during autovacuum.

FossilOrigin-Name: 8097712c9c1f4ea16bc5dd462da248ef98896061
 2017-01-12 15:11:03 +00:00
dan
f91c1318f4 Changes to allow some multi-row UPDATE statements to avoid the two-pass 
approach.

FossilOrigin-Name: 46db23ccd116ce5b9d949f9293be8a2818411b46
 2017-01-10 20:04:38 +00:00
drh
9cc5b4eeb5 Remove an incorrect ALWAYS() macro from balance_nonroot(), which could result 
in corrupt databases if it were optimized out.  This ALWAYS was added 
only two weeks ago (check-in [f9f2e23bbd68a]) and has never appeared in an
official release.

FossilOrigin-Name: e447b23cfd7bb31817e42adb3a98868d351c6b8a
 2016-12-26 01:41:33 +00:00
drh
a582b01698 Simplifications to the way UnpackedRecord objects are allocated. Smaller 
and faster code that also fixes a subtle (currently unreachable) bug.

FossilOrigin-Name: f7ab01f254cd9d7006b8dec29adb234a671b8e6f
 2016-12-21 19:45:54 +00:00
drh
380c08eaad Fix harmless compiler warnings. 
FossilOrigin-Name: ed2c9f3738c96d8e3dbece7ccb721cb1a8ae8fac
 2016-12-13 20:30:29 +00:00
drh
2a70254f74 Remove unnecessary MemPage initialization resets in the autovacuum ptrmap 
processing.

FossilOrigin-Name: 1b36fbb9f05f3a5844e198b489bff36ef6cd908c
 2016-12-12 18:12:03 +00:00
drh
77dc0ed621 Size and performance optimization in btreeInitPage() in the freeblock 
validation step.

FossilOrigin-Name: 57deb1b412e0c328528f2b4d697e326bfd028dca
 2016-12-12 01:30:01 +00:00