| # 2005 July 22 |
| # |
| # The author disclaims copyright to this source code. In place of |
| # a legal notice, here is a blessing: |
| # |
| # May you do good and not evil. |
| # May you find forgiveness for yourself and forgive others. |
| # May you share freely, never taking more than you give. |
| # |
| #*********************************************************************** |
| # This file implements regression tests for SQLite library. |
| # This file implements tests for the ANALYZE command. |
| # |
| # $Id: analyze.test,v 1.9 2008/08/11 18:44:58 drh Exp $ |
| |
| set testdir [file dirname $argv0] |
| source $testdir/tester.tcl |
| set ::testprefix analyzeD |
| |
| ifcapable {!stat4} { |
| finish_test |
| return |
| } |
| |
| |
| # Set up a table with the following properties: |
| # |
| # * Contains 1000 rows. |
| # * Column a contains even integers between 0 and 18, inclusive (so that |
| # a=? for any such integer matches 100 rows). |
| # * Column b contains integers between 0 and 9, inclusive. |
| # * Column c contains integers between 0 and 199, inclusive (so that |
| # for any such integer, c=? matches 5 rows). |
| # * Then add 7 rows with a new value for "a" - 3001. The stat4 table will |
| # not contain any samples with a=3001. |
| # |
| do_execsql_test 1.0 { |
| CREATE TABLE t1(a, b, c); |
| } |
| do_test 1.1 { |
| for {set i 1} {$i < 1000} {incr i} { |
| set c [expr $i % 200] |
| execsql { INSERT INTO t1(a, b, c) VALUES( 2*($i/100), $i%10, $c ) } |
| } |
| |
| execsql { |
| INSERT INTO t1 VALUES(3001, 3001, 3001); |
| INSERT INTO t1 VALUES(3001, 3001, 3002); |
| INSERT INTO t1 VALUES(3001, 3001, 3003); |
| INSERT INTO t1 VALUES(3001, 3001, 3004); |
| INSERT INTO t1 VALUES(3001, 3001, 3005); |
| INSERT INTO t1 VALUES(3001, 3001, 3006); |
| INSERT INTO t1 VALUES(3001, 3001, 3007); |
| |
| CREATE INDEX t1_ab ON t1(a, b); |
| CREATE INDEX t1_c ON t1(c); |
| |
| ANALYZE; |
| } |
| } {} |
| |
| # With full ANALYZE data, SQLite sees that c=150 (5 rows) is better than |
| # a=3001 (7 rows). |
| # |
| do_eqp_test 1.2 { |
| SELECT * FROM t1 WHERE a=3001 AND c=150; |
| } { |
| 0 0 0 {SEARCH TABLE t1 USING INDEX t1_c (c=?)} |
| } |
| |
| do_test 1.3 { |
| execsql { DELETE FROM sqlite_stat1 } |
| db close |
| sqlite3 db test.db |
| } {} |
| |
| # Without stat1, because 3001 is larger than all samples in the stat4 |
| # table, SQLite things that a=3001 matches just 1 row. So it (incorrectly) |
| # chooses it over the c=150 index (5 rows). Even with stat1 data, things |
| # worked this way before commit [e6f7f97dbc]. |
| # |
| do_eqp_test 1.4 { |
| SELECT * FROM t1 WHERE a=3001 AND c=150; |
| } { |
| 0 0 0 {SEARCH TABLE t1 USING INDEX t1_ab (a=?)} |
| } |
| |
| do_test 1.5 { |
| execsql { |
| UPDATE t1 SET a=13 WHERE a = 3001; |
| ANALYZE; |
| } |
| } {} |
| |
| do_eqp_test 1.6 { |
| SELECT * FROM t1 WHERE a=13 AND c=150; |
| } { |
| 0 0 0 {SEARCH TABLE t1 USING INDEX t1_c (c=?)} |
| } |
| |
| do_test 1.7 { |
| execsql { DELETE FROM sqlite_stat1 } |
| db close |
| sqlite3 db test.db |
| } {} |
| |
| # Same test as 1.4, except this time the 7 rows that match the a=? condition |
| # do not feature larger values than all rows in the stat4 table. So SQLite |
| # gets this right, even without stat1 data. |
| do_eqp_test 1.8 { |
| SELECT * FROM t1 WHERE a=13 AND c=150; |
| } { |
| 0 0 0 {SEARCH TABLE t1 USING INDEX t1_c (c=?)} |
| } |
| |
| finish_test |
| |