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5569b3eb09
InnoDB takes a lot of time to perform null updates. The reason is that
even though an empty update vector was created, InnoDB will go on to
write undo log records and update the system columns
DB_TRX_ID and DB_ROLL_PTR in the clustered index, and of course write
redo log for all this.
This could have been fixed properly in
commit 54a492ecac more than 10 years ago.
355 lines
9.8 KiB
Text
355 lines
9.8 KiB
Text
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#Note:- WL6742 has been removed from 5.7 (Bug 23046302),
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# but we are keeping this test since it tests
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# count(*) correctness for various isolation
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# levels.
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--echo #
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--echo # WL#6742 - Test the interaction of multiple transactions using
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--echo # different isolation levels to make sure that the value returned
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--echo # by count(*) always reflects the correct view of the table according
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--echo # to the transaction's selected isolation level.
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--echo #
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--source include/have_innodb.inc
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--disable_query_log
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let $MYSQLD_DATADIR= `select @@datadir`;
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let $initial_timeout=`select @@innodb_lock_wait_timeout`;
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--enable_query_log
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--echo #
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--echo # Traverse various indexes to get the right counts.
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--echo # This especially tests count(*) which is pushed down to InnoDB in WL#6742.
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--echo #
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CREATE TABLE t1 (
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c1 INT AUTO_INCREMENT PRIMARY KEY,
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c2 INT,
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c3 INT,
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c4 INT,
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INDEX k2(c2)
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) Engine=InnoDB;
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let $1=10;
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while ($1 > 0) {
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INSERT INTO t1(c2,c3,c4) VALUES (1, 1, 1);
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dec $1;
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}
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CREATE TABLE t2 LIKE t1;
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--enable_info
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INSERT INTO t2 (SELECT * FROM t1);
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--disable_info
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Do some DML in the default connection and leave the transaction pending.
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--echo #
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SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
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BEGIN;
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--enable_info
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UPDATE t1 SET c2 = c2 * 3 WHERE c1 = 1;
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DELETE FROM t1 WHERE c1 = 6;
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--disable_info
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Start transactions of Repeatable Read, Read Committed, and Read Uncommitted
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--echo #
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--echo # Connection 1 REPEATABLE READ
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--echo #
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connect (con1,localhost,root,,);
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SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
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BEGIN;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--enable_info
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UPDATE t1 SET c2 = c2 * 5 WHERE c1 = 2;
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DELETE FROM t1 WHERE c1 = 7;
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INSERT INTO t1(c2,c3,c4) VALUES (100, 1, 1);
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--disable_info
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Test a lock wait timeout during COUNT(*)
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--echo #
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SET innodb_lock_wait_timeout = 1;
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--error ER_LOCK_WAIT_TIMEOUT
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SELECT COUNT(*) FROM t1 FOR UPDATE;
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--echo #
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--echo # Connection 2 READ COMMITTED
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--echo #
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connect (con2,localhost,root,,);
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SET SESSION TRANSACTION ISOLATION LEVEL READ COMMITTED;
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BEGIN;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--enable_info
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UPDATE t1 SET c2 = c2 * 7 WHERE c1 = 3;
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DELETE FROM t1 WHERE c1 = 8;
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INSERT INTO t1(c2,c3,c4) VALUES (1000, 1, 1);
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--disable_info
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Connection 3 READ UNCOMMITTED
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--echo #
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connect (con3,localhost,root,,);
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SET SESSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
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BEGIN;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--enable_info
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UPDATE t1 SET c2 = c2 * 11 WHERE c1 = 4;
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INSERT INTO t1(c2,c3,c4) VALUES (10000, 1, 1);
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DELETE FROM t1 WHERE c1 in(9);
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--disable_info
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Connection default REPEATABLE READ
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--echo #
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connection default;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Commit the 3 extra connections
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--echo #
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--echo # Connection 1 REPEATABLE READ
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--echo #
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connection con1;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Connection 2 READ COMMITTED
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--echo #
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connection con2;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Connection 3 READ UNCOMMITTED
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--echo #
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connection con3;
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--source suite/innodb/include/innodb_isolation_selects.inc
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COMMIT;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Connection 2 READ COMMITTED
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--echo #
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connection con2;
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--source suite/innodb/include/innodb_isolation_selects.inc
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COMMIT;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Connection 1 REPEATABLE READ
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--echo #
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connection con1;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Select the first 5 records FOR UPDATE using count(*) in a subquery.
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--echo # The second record is still pending so we get a lock timeout.
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--echo #
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SET innodb_lock_wait_timeout = 1;
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--error ER_LOCK_WAIT_TIMEOUT
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SELECT c1, c2 FROM t1 WHERE c1 < ((SELECT COUNT(*) FROM t1) / 2) FOR UPDATE;
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--error ER_LOCK_WAIT_TIMEOUT
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SELECT COUNT(*) FROM t1 FOR UPDATE;
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COMMIT;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Show The EXPLAIN output for these queries;
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--echo #
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# column 10 is the row count provided by handler::info(). In InnoDB, this is
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# a statistical estimate. After the multi-transactional changes above,
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# Solaris reports 10 rows which is correct, but other OSes report 9.
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--replace_column 10 #
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EXPLAIN SELECT * FROM t1;
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EXPLAIN SELECT COUNT(*) FROM t1;
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EXPLAIN SELECT COUNT(c1) FROM t1;
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--replace_column 10 #
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EXPLAIN SELECT COUNT(c2) FROM t1;
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--replace_column 10 #
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EXPLAIN SELECT COUNT(c3) FROM t1;
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--replace_column 10 #
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EXPLAIN SELECT SUM(c1) FROM t1;
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--replace_column 10 #
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EXPLAIN SELECT SUM(c2) FROM t1;
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--replace_column 10 #
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EXPLAIN SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
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--replace_column 10 #
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EXPLAIN SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
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--replace_column 10 #
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EXPLAIN SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
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--replace_column 10 #
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EXPLAIN SELECT COUNT(*) FROM t1 WHERE c1 > (SELECT AVG(c1) FROM t1);
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--echo #
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--echo # Make all indexes in t2 obsolete to the active repeatable read transaction
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--echo # in the default connection.
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--echo #
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ALTER TABLE t2 row_format=redundant;
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--echo #
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--echo # Connection default REPEATABLE READ
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--echo # Do more DML in the default REPEATABLE READ transaction in order to use recently committed records.
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--echo #
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connection default;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--enable_info
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UPDATE t1 SET c4 = c2 * 10;
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--disable_info
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Table t2 has been altered to a new row format.
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--echo # The index should not be useable.
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--echo #
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--error ER_TABLE_DEF_CHANGED
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SELECT COUNT(*) FROM t2;
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--error ER_TABLE_DEF_CHANGED
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SELECT * FROM t2;
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COMMIT;
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SELECT COUNT(*) FROM t2;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Connection 2
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--echo #
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connection con2;
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--source suite/innodb/include/innodb_isolation_selects.inc
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--echo #
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--echo # Try COUNT(*) on a DISCARDED table.
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--echo #
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connection default;
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CREATE TABLE t4 LIKE t1;
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INSERT INTO t4 (SELECT * FROM t1);
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SELECT COUNT(*) FROM t4;
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ALTER TABLE t4 DISCARD TABLESPACE;
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--error ER_TABLESPACE_DISCARDED
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SELECT COUNT(*) FROM t4;
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--echo #
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--echo # Test the interaction of a repeatable read transaction
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--echo # to changes that happen outside its view.
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--echo #
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CREATE TABLE t5 (a INT AUTO_INCREMENT PRIMARY KEY, b TEXT, aa INT, bb TEXT) Engine=InnoDB;
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INSERT INTO t5(b) VALUES ("inserted by client 1");
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INSERT INTO t5(b) VALUES ("inserted by client 1");
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INSERT INTO t5(b) VALUES ("inserted by client 1");
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INSERT INTO t5(b) VALUES ("inserted by client 1");
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UPDATE t5 SET aa=a, bb=b;
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CREATE TABLE t6 (a INT AUTO_INCREMENT PRIMARY KEY, b TEXT, aa INT, bb TEXT) Engine=InnoDB;
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INSERT INTO t6(b) VALUES ("inserted by client 1");
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INSERT INTO t6(b) VALUES ("inserted by client 1");
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INSERT INTO t6(b) VALUES ("inserted by client 1");
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INSERT INTO t6(b) VALUES ("inserted by client 1");
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UPDATE t6 SET aa=a, bb=b;
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CREATE TABLE t7 (a INT AUTO_INCREMENT PRIMARY KEY, b TEXT, aa INT, bb TEXT) Engine=InnoDB;
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INSERT INTO t7(b) VALUES ("inserted by client 1");
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INSERT INTO t7(b) VALUES ("inserted by client 1");
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INSERT INTO t7(b) VALUES ("inserted by client 1");
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INSERT INTO t7(b) VALUES ("inserted by client 1");
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UPDATE t7 SET aa=a, bb=b;
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BEGIN;
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SELECT * FROM t5;
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SELECT COUNT(*) FROM t5;
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SELECT * FROM t6;
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SELECT COUNT(*) FROM t6;
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SELECT * FROM t7;
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SELECT COUNT(*) FROM t7;
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--echo #
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--echo # Connection 1
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--echo #
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connection con1;
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INSERT INTO t5(b) VALUES ("inserted by client 2");
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UPDATE t5 SET a = 10 where a = 1;
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UPDATE t5 SET b = "updated by client 2" where a = 2;
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DELETE FROM t5 WHERE a = 3;
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SELECT * FROM t5;
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SELECT COUNT(*) FROM t5;
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INSERT INTO t6(b) VALUES ("inserted by client 2");
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UPDATE t6 SET a = 10 where a = 1;
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UPDATE t6 SET b = "updated by client 2" where a = 2;
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DELETE FROM t6 WHERE a = 3;
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SELECT * FROM t6;
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SELECT COUNT(*) FROM t6;
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INSERT INTO t7(b) VALUES ("inserted by client 2");
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UPDATE t7 SET a = 10 where a = 1;
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UPDATE t7 SET b = "updated by client 2" where a = 2;
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DELETE FROM t7 WHERE a = 3;
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SELECT * FROM t7;
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SELECT COUNT(*) FROM t7;
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--echo #
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--echo # Connection default
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--echo #
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connection default;
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SELECT * FROM t5;
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INSERT INTO t5(b) VALUES ("inserted by client 1");
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SELECT * FROM t5;
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UPDATE t5 SET a = a + 100;
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SELECT * FROM t5;
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SELECT COUNT(*) FROM t5;
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UPDATE t6 SET b = "updated by client 2";
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SELECT * FROM t6;
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SELECT * FROM t6 LOCK IN SHARE MODE;
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SELECT COUNT(*) FROM t6;
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DELETE FROM t7;
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SELECT * FROM t7;
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SELECT COUNT(*) FROM t7;
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COMMIT;
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SELECT * FROM t5;
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SELECT COUNT(*) FROM t5;
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SELECT * FROM t6;
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SELECT COUNT(*) FROM t6;
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SELECT * FROM t7;
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SELECT COUNT(*) FROM t7;
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--echo #
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--echo # Cleanup
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--echo #
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DROP TABLE t1,t2,t4,t5,t6,t7;
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disconnect con1;
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disconnect con2;
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disconnect con3;
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--disable_query_log
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eval set global innodb_lock_wait_timeout=$initial_timeout;
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--enable_query_log
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--echo #
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--echo # Bug #23596760: FORCE INDEX IS SKIPPED WHILE EXECUTING SELECT COUNT(*)
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--echo #
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CREATE TABLE t1(c1 INT NOT NULL PRIMARY KEY,
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c2 INT NOT NULL DEFAULT 1,
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c3 char(20) DEFAULT '',
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KEY c2_idx (c2)) ENGINE=InnoDB;
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INSERT INTO t1(c1) VALUES (1), (2), (3);
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INSERT INTO t1(c1) SELECT c1 + 10 FROM t1;
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INSERT INTO t1(c1) SELECT c1 + 100 FROM t1;
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CREATE TABLE t2 SELECT * FROM t1;
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let query1= SELECT COUNT(*) FROM t1;
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let query2= SELECT COUNT(*) FROM t1 FORCE INDEX(c2_idx);
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let query3= SELECT COUNT(*) FROM t1, t2;
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let query4= SELECT COUNT(*) FROM t1 FORCE INDEX(c2_idx), t2;
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eval EXPLAIN $query1;
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eval EXPLAIN $query2;
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eval EXPLAIN $query3;
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eval EXPLAIN $query4;
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DROP TABLE t1, t2;
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