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4e1e9ea6f3
From the very beginning, the default InnoDB transaction isolation level
REPEATABLE READ does not correspond to any well formed definition.
The main issue is the lack of write/write conflict detection.
To fix that and to make REPEATABLE READ correspond to Snapshot Isolation,
b8a6719889 introduced the Boolean
session variable innodb_snapshot_isolation. It was disabled by default
in order not to break any user applications.
In a new major version of MariaDB Server, we had better enable this
parameter by default.
359 lines
10 KiB
Text
359 lines
10 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 innodb_snapshot_isolation=OFF;
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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 innodb_snapshot_isolation=OFF;
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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 9 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 9 #
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EXPLAIN SELECT * FROM t1;
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--replace_column 9 #
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EXPLAIN SELECT COUNT(*) FROM t1;
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--replace_column 9 #
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EXPLAIN SELECT COUNT(c1) FROM t1;
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--replace_column 9 #
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EXPLAIN SELECT COUNT(c2) FROM t1;
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--replace_column 9 #
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EXPLAIN SELECT COUNT(c3) FROM t1;
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--replace_column 9 #
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EXPLAIN SELECT SUM(c1) FROM t1;
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--replace_column 9 #
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EXPLAIN SELECT SUM(c2) FROM t1;
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--replace_column 9 #
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EXPLAIN SELECT AVG(c1), MAX(c1), MIN(c2), AVG(c3), SUM(c4) FROM t1;
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--replace_column 9 #
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EXPLAIN SELECT c1, c2 FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
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--replace_column 9 #
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EXPLAIN SELECT COUNT(c2) FROM t1 WHERE c1 > ((SELECT COUNT(*) FROM t1) / 2);
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--replace_column 9 #
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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 STATS_PERSISTENT=0;
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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 STATS_PERSISTENT=0 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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