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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 check-ins occurring around 7edf39eb93a8f905.

2013-11-23
22:45
A much simpler fix is to simply change MEMSYS5 so that it takes any free block of the appropriate size (the first on the list of free blocks) rather than searching for the one with the smallest address. This is also faster than using the min-heap algorithm. Need to research to verify that the allocator still satisfies the Robson proof, however. Closed-Leaf check-in: 8191b512 user: drh tags: memsys5-performance
21:30
Use a heap-based primary queue rather than a linked list to store the available free blocks of each size in MEMSYS5, since this provides faster access to the first available block. Closed-Leaf check-in: 7d2cdfad user: drh tags: memsys5-performance
21:29
Add newlines at the end of some error messages in speedtest1. check-in: 6b98f0af user: drh tags: trunk
11:45
Report errors from sqlite3_exec() and sqlite3_config() in speedtest1. Fix a bug in the main testing logic that was found by these error reports. check-in: 659f1a98 user: drh tags: trunk
04:32
Fix the order of parameters to SQLITE_CONFIG_PAGECACHE in the speedtest1.exe program. check-in: dbe85ef6 user: drh tags: trunk
04:22
Adjust MSVC makefile to avoid using forward slashes in file names. check-in: facf6dea user: mistachkin tags: trunk
04:16
Add the "speedtest1.exe" test program. check-in: fb6f0c6d user: drh tags: trunk
00:27
Add experimental sqlite3_config option to control the native Win32 heap size. check-in: f09f11e9 user: mistachkin tags: winHeapSize
2013-11-22
21:32
Fix harmless compiler warning. check-in: f336c18f user: mistachkin tags: trunk
00:49
Minor correction to the batch build tool for MSVC. check-in: 22144c9d user: mistachkin tags: trunk
2013-11-21
23:37
Fix a harmless clang warning in the command-line shell. check-in: 3d47a556 user: drh tags: trunk
22:02
Slight change to the --timer output on wordcount for better display on windows: Avoid showing the full pathname of the executable. check-in: b9e047b9 user: drh tags: trunk
21:59
Changes some offset and amount parameters from "int" to "u32" to avoid harmless signed/unsigned comparison warnings. check-in: 4e8c5d07 user: drh tags: trunk
21:40
Modify wordcount so that timer information appears on standard error instead of standard output. Rename the run-wordcount.bash script to run-wordcount.sh and simplify it so that it stands a better chance of running on non-GNU systems. check-in: 586c11ed user: drh tags: trunk
21:23
Do not reuse factored constants that might have had their encodings changed. check-in: 487f2036 user: drh tags: trunk
20:48
Fix the code generator to honor turning off constant expression factoring. check-in: 88262266 user: drh tags: trunk
19:27
Add the --timer option to the wordcount test program. check-in: a89fdf87 user: drh tags: trunk
19:05
Remove a test from sqlite3VdbeMemFromBtree() which was unnecessary, and after the recent OP_Column refactoring, unreachable. check-in: 23667f3b user: drh tags: trunk
17:24
Make sure the OP_Next and OP_NextIfOpen opcodes are numbered close together for efficiency in switch() statements. OP_Prev and OP_PrevIfOpen too. check-in: d4ccf0f5 user: drh tags: trunk
16:08
When one or more arguments to a function are constants, try to factor out just those arguments into initialization code. check-in: 50d350ab user: drh tags: trunk
14:44
Remove the obsolete TK_CONST_FUNC token type. check-in: 9b4217f0 user: drh tags: trunk
14:33
Add the ability to factor constant functions out of inner loops. But do not factor out non-constant functions, like random(). check-in: 1b0f779e user: drh tags: trunk
04:18
Another improvement to OP_Function and an improvement to OP_Move. check-in: 70b056fb user: drh tags: trunk
03:43
A simple change to the OP_Function opcode improves overall performance by about 0.5%. check-in: b890eefd user: drh tags: trunk
03:12
Performance optimization to the OP_Next and OP_Prev opcodes. check-in: ecaac28a user: drh tags: trunk
01:33
Refactor the OP_Column opcode to make it clearer and easier to maintain. Overall, performance tests show about a 1% speed increase with this change. check-in: 972881c6 user: drh tags: trunk
01:04
Reduce the size of VdbeCursor again, this time without a performance hit. Closed-Leaf check-in: 93393993 user: drh tags: OP_Column-refactor
00:10
Unpack some fields, adding some space back to the VdbeCursor object, in order to help the code to run a little faster. check-in: f8d5efcd user: drh tags: OP_Column-refactor
2013-11-20
21:51
Reduce the size of the VdbeCursor object from 144 to 120 bytes. check-in: 5f9d5068 user: drh tags: OP_Column-refactor
20:58
Improved comments on the OP_Column changes. Optimize out loading of overflow pages for content with zero length. Add test cases for the latter. check-in: 0e05679d user: drh tags: OP_Column-refactor
19:28
Further performance tweaks to OP_Column. check-in: 0e3f5df6 user: drh tags: OP_Column-refactor
17:25
Refactoring the OP_Column opcode for improved performance and maintainability. check-in: 7c914e39 user: drh tags: OP_Column-refactor
02:53
Simplifications to the VdbeCursor object. check-in: 5562cd34 user: drh tags: trunk
00:59
Performance improvement for the OP_MustBeInt opcode in the VDBE. check-in: 96a65388 user: drh tags: trunk
2013-11-19
18:17
Fix a harmless MSVC compiler warning. check-in: 6cc023bb user: drh tags: trunk
13:55
Minor performance improvement to sqlite3SerialTypeGet(). check-in: 17e8524f user: drh tags: trunk
12:33
Change Noop-comments in where.c into Module-comments, so that they are omitting without SQLITE_ENABLE_MODULE_COMMENTS. check-in: 3e577f40 user: drh tags: trunk
02:34
Avoid seeking on the main data table during the first loop of an UPDATE if an index is sufficient to check the WHERE clause. check-in: 57158d9d user: drh tags: trunk
00:31
Fix an requirement mark in a test script so that it matches the typo-corrected requirement. No changes to code. check-in: 072412d5 user: drh tags: trunk
2013-11-18
19:32
Add comments identifing where the skip-scan option is decided in the query planner, to aid in tuning that decision. No changes to code. check-in: e9df04ce user: drh tags: trunk
18:48
Fix documentation typos. No changes to code. check-in: 7caeb09c user: drh tags: trunk
11:20
Fix harmless compiler warnings from clang scan-build. check-in: 8d002740 user: drh tags: trunk
08:41
Fix a problem with the shell tool EXPLAIN indentation code and VDBE sub-programs. check-in: 9c8d6856 user: dan tags: trunk
03:11
Enable the ONEPASS optimization for DELETE, for both rowid and WITHOUT ROWID tables. check-in: 44a07afd user: drh tags: trunk
2013-11-17
02:42
Make sure one-pass DELETE for WITHOUT ROWID tables correctly positions the PRIMARY KEY cursor. Make the same fix for UPDATE. Closed-Leaf check-in: 6bd5750b user: drh tags: optimize-delete
2013-11-16
23:16
Fix a couple of minor problems with the new delete logic. check-in: a11243f8 user: drh tags: optimize-delete
23:03
Fix an OOM-recovery problem in the DELETE code generator. check-in: dc7be158 user: drh tags: optimize-delete
22:48
Combine the rowid and WITHOUT ROWID paths for DELETE into a single path. check-in: c4734b88 user: drh tags: optimize-delete
20:45
The one-pass optimization is now working for DELETE on WITHOUT ROWID tables. check-in: e4d220a3 user: drh tags: optimize-delete
20:13
Enhance the DELETE logic so that it can make use of WHERE_ONEPASS_DESIRED for rowid tables. check-in: 8f479a72 user: drh tags: optimize-delete
15:35
Fully constraint the ORDER BY on the top-10 line of the --summary output from the wordcount test program. Add the run-wordcount.bash script for running wordcount in various configurations. check-in: 7edf39eb user: drh tags: trunk
14:03
Avoid unnecessary OP_IfNull checks when doing a range query where there is a constraint on the lower bound of the range. check-in: de08a7e7 user: drh tags: trunk
13:55
Simplification and performance improvement to the logic that factors constant expressions ouf of inner loops. check-in: ee9353fd user: drh tags: trunk
12:56
Fix testcase misc7-16 so that it works with the new UNIQUE constraint error message format. check-in: c7f2ed9f user: drh tags: trunk
2013-11-15
20:06
Add ALWAYS and NEVER macros to currently unreachable but important branches in sqlite3ExprCompare(). Closed-Leaf check-in: cee835fe user: drh tags: expr-codegen-enhancement
19:00
Merge the operator comment fixes from trunk. check-in: 9f14f55c user: drh tags: expr-codegen-enhancement
18:58
Fix comments on the OP_Divide and OP_Remainder operators, especially the "Synopsis:" comment, so that they agree with the actual implementation. check-in: cc17f1f0 user: drh tags: trunk
18:15
Changes to make the new constant expression factoring logic more general and more testable. check-in: d10fb49a user: drh tags: expr-codegen-enhancement
16:48
Add test cases for INSERT INTO ... DEFAULT VALUES on tables with numeric constants in CHECK constraints. check-in: 79ec485b user: drh tags: expr-codegen-enhancement
15:52
Improvements to the Expr comparison routine to make it more general. Improvements to unary-minus code generation so that it can make use of a global constant register with a zero value. check-in: 835be656 user: drh tags: expr-codegen-enhancement
13:12
Add the --query option to the wordcount test program. check-in: 5960d11e user: drh tags: trunk
12:41
Simplify the range scan code generate while also avoiding an unnecessary OP_Affinity opcode. check-in: 372686bf user: drh tags: expr-codegen-enhancement
03:30
Merge EXPLAIN fixes from trunk. check-in: cd579727 user: drh tags: expr-codegen-enhancement
03:21
Fix a typo in the "synopsis" for the OP_Lt opcode that causes an incorrect comment to be added to EXPLAIN output. check-in: d99a30a2 user: drh tags: trunk
03:16
Another adjustment to the EXPLAIN indentation logic, in order to deal with the sorter loop on a CREATE INDEX statement. check-in: cbe85cc2 user: drh tags: trunk
01:10
Rework the logic that factors constant expressions out of inner loops, making it both simpler and faster. check-in: 8dc5c76c user: drh tags: expr-codegen-enhancement
2013-11-14
23:59
Adjust the command-line shell EXPLAIN indentation logic to handle the second loop of an UPDATE that reads out a RowSet. check-in: ea141a9b user: drh tags: trunk
19:34
Remove an unused local variable. check-in: 10d59226 user: drh tags: trunk
19:18
Merge the skip-scan optimization into the sessions branch. check-in: 7596d1bf user: drh tags: sessions
15:35
An experimental virtual tables for showing the content of internal schema objects. Leaf check-in: d1fbc6ca user: drh tags: schema2-vtab
00:09
Simplification to the progress callback check. One branch removed. check-in: 24ef1654 user: drh tags: trunk
2013-11-13
23:48
Make sure the progress callback is invoked prior to an SQLITE_ROW return if it is overdue to be called. check-in: 21f59b04 user: drh tags: trunk
20:46
Merge the skip-scan enhancement into trunk. check-in: b0bb975c user: drh tags: trunk
19:01
Import the "PRAGMA vdbe_eqp" enhancement and the enhanced EXPLAIN formatting the shell from trunk. Fix a bug in skip-scan and add a test case to prevent a regression. Closed-Leaf check-in: f668616a user: drh tags: skip-scan
18:35
In the shell tool, if an "EXPLAIN" command is executed in ".explain on" mode, attempt to automatically indent the bodies of loops in the output VDBE program. check-in: e7d34ec6 user: dan tags: trunk
17:58
Add the "PRAGMA vdbe_eqp" command, only available with SQLITE_DEBUG. Simplify some of the other debugging logic. check-in: 8ce33f4c user: drh tags: trunk
17:24
Add VDBE comments to the beginning and end of skip-scan loops. check-in: 0c85d93b user: drh tags: skip-scan
16:58
Improve the way that skip-scan loops are constructued. Add test cases. Improved the scoring of skip-scan loops. check-in: 5e75ab93 user: drh tags: skip-scan
15:32
Add test cases for skip-scan. Enhance "do_test" so that if the expected result is of the form "/*..*/" or "~/*..*/" it treats the expected result as a glob pattern rather than as a regular expression. Fix a bug in ANALYZE result loading associated with WITHOUT ROWID tables. check-in: d3e6e9b2 user: drh tags: skip-scan
12:27
Add the ability to use an index even if the left-most columns of the index are unconstrainted, provided that the left-most columns have few distinct values. check-in: 27dd5993 user: drh tags: skip-scan
08:55
Avoid an unnecessary OP_IfNull while doing an indexed search. check-in: 51960009 user: drh tags: trunk
2013-11-12
21:37
Adjust the SQLITE_MALLOCSIZE defines, primarily to make sure _msize gets used with MSVC when appropriate. check-in: 4e7e805e user: mistachkin tags: trunk
21:10
Fix harmless compiler warning. check-in: ddacd101 user: mistachkin tags: trunk
20:18
Minor enhancements to the auxiliary information added to EXPLAIN output with SQLITE_EXPLAIN_ENABLE_COMMENTS. check-in: 0d1328e3 user: drh tags: trunk
18:37
Break out the structure and macro definitions of where.c into a separate header file whereInt.h for easier editing and debugging. check-in: c4446712 user: drh tags: trunk
17:46
When possible, have FTS use 32-bit operations to read varints from the database. check-in: aa7ba302 user: dan tags: trunk
15:39
Import recent bug fixes from trunk. check-in: 20eeee4c user: drh tags: sessions
15:33
A better (simpler) fix to the count(*) problem addressed in the previous check-in. check-in: 0f924c6e user: drh tags: trunk
14:55
Make sure the count(*) optimization works correctly on WITHOUT ROWID tables. check-in: 91174779 user: drh tags: trunk
12:30
Update test command [explain_i] to handle the opcodes used by virtual tables (VNext, VFilter etc.). check-in: 1b215ee3 user: dan tags: trunk
12:17
Fix for [4065ac8595]: Do not order CROSS or LEFT joins, even if the right-hand-side is a virtual table. check-in: e2684ece user: dan tags: trunk
01:11
Fix an error message in the spellfix extension so that it conforms to the style of error messages in the core. check-in: b896ae3d user: drh tags: trunk
2013-11-11
23:26
Add a comment to the sqlite3_index_info structure indicating that the new field is only available in SQLite 3.8.2 or later. check-in: 239648f8 user: drh tags: trunk
23:02
Fix two test cases (due to changes in the formatting of constraint errors) so that all tests now pass. check-in: 129e2b69 user: drh tags: sessions
22:55
Merge in the WITHOUT ROWID changes. A few tests are failing now. They will be fixed in a follow-on check-in. check-in: 5addd123 user: drh tags: sessions
19:56
Fix typos in compile and run-time tests of the sqlite library version number in rtree.c. check-in: f58d5701 user: dan tags: trunk
19:01
Add a way for virtual tables to return the expected number of rows for a scan (not just the overall cost) to SQLite. Have the rtree module make use of this. check-in: 5a3cfd74 user: dan tags: trunk
16:55
Remove unreachable code, replacing it in most cases with assert() or NEVER() macros. check-in: 924d63b2 user: drh tags: trunk
03:37
Fix issue with several memory allocation tests due to KeyInfo allocations now being shared. check-in: 569fedd6 user: mistachkin tags: trunk
03:24
Convert several ALWAYS() macros in vdbe.c into assert() statements. check-in: acc40ff6 user: drh tags: trunk