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4361c8645b
backport dmitry.shulga@oracle.com-20120209125742-w7hdxv0103ymb8ko from mysql-trunk: Patch for bug#11764747 (formerly known as 57612): SET GLOBAL READ_ONLY=1 cannot progress when a table is locked with LOCK TABLES. The reason for the bug was that mysql server makes a flush of all open tables during handling of statement 'SET GLOBAL READ_ONLY=1'. Therefore if some of these tables were locked by "LOCK TABLE ... READ" from a different connection, then execution of statement 'SET GLOBAL READ_ONLY=1' would be waiting for the lock for such table even if the table was locked in a compatible read mode. Flushing of all open tables before setting of read_only system variable is inherited from 5.1 implementation since this was the only possible approach to ensure that there isn't any pending write operations on open tables. Start from version 5.5 and above such behaviour is guaranteed by the fact that we acquire global_read_lock before setting read_only flag. Since acquiring of global_read_lock is successful only when there isn't any active write operation then we can remove flushing of open tables from processing of SET GLOBAL READ_ONLY=1. This modification changes the server behavior so that read locks held by other connections (LOCK TABLE ... READ) no longer will block attempts to enable read_only.
228 lines
4.9 KiB
Text
228 lines
4.9 KiB
Text
DROP TABLE IF EXISTS table_11733 ;
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grant CREATE, SELECT, DROP on *.* to test@localhost;
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set global read_only=0;
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create table table_11733 (a int) engine=InnoDb;
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BEGIN;
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insert into table_11733 values(11733);
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set global read_only=1;
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select @@global.read_only;
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@@global.read_only
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1
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select * from table_11733 ;
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a
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11733
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COMMIT;
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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set global read_only=0;
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drop table table_11733 ;
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drop user test@localhost;
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GRANT CREATE, SELECT, DROP ON *.* TO test@localhost;
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CREATE TABLE t1(a INT) ENGINE=INNODB;
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INSERT INTO t1 VALUES (0), (1);
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SET GLOBAL read_only=1;
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SELECT * FROM t1;
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a
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0
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1
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BEGIN;
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SELECT * FROM t1;
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a
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0
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1
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COMMIT;
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SET GLOBAL read_only=0;
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FLUSH TABLES WITH READ LOCK;
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SELECT * FROM t1;
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a
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0
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1
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BEGIN;
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SELECT * FROM t1;
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a
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0
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1
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COMMIT;
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UNLOCK TABLES;
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connection con1;
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lock table t1 read;
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connection default;
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set global read_only=1;
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connection con1;
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unlock tables;
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connection default;
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SET GLOBAL read_only=0;
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UNLOCK TABLES;
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DROP TABLE t1;
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DROP USER test@localhost;
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echo End of 5.1 tests
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#
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# Bug#33669: Transactional temporary tables do not work under --read-only
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#
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DROP DATABASE IF EXISTS db1;
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# Setup user and tables
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CREATE USER bug33669@localhost;
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CREATE DATABASE db1;
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CREATE TABLE db1.t1 (a INT) ENGINE=INNODB;
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CREATE TABLE db1.t2 (a INT) ENGINE=INNODB;
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INSERT INTO db1.t1 VALUES (1);
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INSERT INTO db1.t2 VALUES (2);
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GRANT CREATE TEMPORARY TABLES, DROP, INSERT, DELETE, UPDATE,
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SELECT, LOCK TABLES ON db1.* TO bug33669@localhost;
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SET GLOBAL READ_ONLY = ON;
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# Connection con1 (user bug33669):
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# Create, insert and drop temporary table:
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CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
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INSERT INTO temp VALUES (1);
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DROP TABLE temp;
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# Lock base tables and use temporary table:
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CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
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LOCK TABLES t1 READ, t2 READ;
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SELECT * FROM t1;
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a
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1
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INSERT INTO temp values (1);
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SELECT * FROM t2;
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a
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2
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UNLOCK TABLES;
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DROP TABLE temp;
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# Transaction
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BEGIN;
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SELECT * FROM t1;
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a
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1
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CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
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INSERT INTO t1 VALUES (1);
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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INSERT INTO temp VALUES (1);
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SELECT * FROM t2;
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a
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2
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ROLLBACK;
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SELECT * FROM temp;
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a
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DROP TABLE temp;
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# Lock base table as READ and temporary table as WRITE:
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CREATE TEMPORARY TABLE temp (a INT) ENGINE=INNODB;
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LOCK TABLES t1 READ, temp WRITE;
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SELECT * FROM t1;
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a
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1
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SELECT * FROM temp;
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a
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INSERT INTO t1 VALUES (1);
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ERROR HY000: The MariaDB server is running with the --read-only option so it cannot execute this statement
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INSERT INTO temp VALUES (1);
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DROP TABLE temp;
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UNLOCK TABLES;
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# Lock temporary table that shadows a base table:
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CREATE TEMPORARY TABLE t1 (a INT) ENGINE=INNODB;
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LOCK TABLES t1 WRITE;
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DROP TABLE t1;
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SELECT * FROM t1;
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ERROR HY000: Table 't1' was not locked with LOCK TABLES
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# INSERT SELECT from base table into temporary table:
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CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
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CREATE TEMPORARY TABLE temp2 LIKE temp1;
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BEGIN;
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INSERT INTO temp1 VALUES (10);
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INSERT INTO temp2 VALUES (10);
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INSERT INTO temp1 SELECT * FROM t1;
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INSERT INTO temp2 SELECT * FROM t2;
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SELECT * FROM temp1 ORDER BY a;
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a
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1
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10
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SELECT * FROM temp2 ORDER BY a;
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a
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2
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10
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ROLLBACK;
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SELECT * FROM temp1,temp2;
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a a
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LOCK TABLES t1 READ, t2 READ;
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INSERT INTO temp1 VALUES (10);
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INSERT INTO temp2 VALUES (10);
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INSERT INTO temp1 SELECT * FROM t1;
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INSERT INTO temp2 SELECT * FROM t2;
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SELECT * FROM temp1 ORDER BY a;
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a
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1
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10
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SELECT * FROM temp2 ORDER BY a;
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a
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2
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10
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UNLOCK TABLES;
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DELETE temp1, temp2 FROM temp1, temp2;
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INSERT INTO temp1 VALUES (10);
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INSERT INTO temp2 VALUES (10);
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INSERT INTO temp1 SELECT * FROM t1;
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INSERT INTO temp2 SELECT * FROM t2;
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SELECT * FROM temp1 ORDER BY a;
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a
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1
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10
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SELECT * FROM temp2 ORDER BY a;
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a
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2
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10
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DROP TABLE temp1, temp2;
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# INSERT and INSERT SELECT that uses subqueries:
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CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
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CREATE TEMPORARY TABLE temp2 LIKE temp1;
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INSERT INTO temp1 (a) VALUES ((SELECT MAX(a) FROM t1));
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LOCK TABLES t2 READ;
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INSERT INTO temp2 (a) VALUES ((SELECT MAX(a) FROM t2));
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UNLOCK TABLES;
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LOCK TABLES t1 READ, t2 READ;
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INSERT INTO temp1 SELECT * FROM t1 WHERE a < (SELECT MAX(a) FROM t2);
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INSERT INTO temp2 SELECT * FROM t2 WHERE a > (SELECT MAX(a) FROM t1);
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UNLOCK TABLES;
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INSERT INTO temp1 SELECT * FROM t1 WHERE a < (SELECT MAX(a) FROM t2);
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INSERT INTO temp2 SELECT * FROM t2 WHERE a > (SELECT MAX(a) FROM t1);
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SELECT * FROM temp1 ORDER BY a;
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a
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1
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1
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1
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SELECT * FROM temp2 ORDER BY a;
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a
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2
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2
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2
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DROP TABLE temp1, temp2;
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# Multiple table update:
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CREATE TEMPORARY TABLE temp1 (a INT) ENGINE=INNODB;
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CREATE TEMPORARY TABLE temp2 LIKE temp1;
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INSERT INTO temp1 VALUES (1),(2);
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INSERT INTO temp2 VALUES (3),(4);
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UPDATE temp1,temp2 SET temp1.a = 5, temp2.a = 10;
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SELECT * FROM temp1, temp2;
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a a
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5 10
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5 10
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5 10
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5 10
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DROP TABLE temp1, temp2;
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# Disconnect and cleanup
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SET GLOBAL READ_ONLY = OFF;
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DROP USER bug33669@localhost;
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DROP DATABASE db1;
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