Mysql 4.0 casual

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  • Mysql 4.0 casual

    1. 1. $ grep innodb_buffer_pool /etc/my.cnfinnodb_buffer_pool_size = 10G$ echo "show variables like innodb_buffer_pool_size" | mysql -t+-------------------------+------------+| Variable_name           | Value      |+-------------------------+------------+| innodb_buffer_pool_size | 2147483648 | = 2GB+-------------------------+------------+
    2. 2. CREATE TABLE hoge ( id int unsigned NOT NULL auto_increment primary key, level tinyint NOT NULL default 1, KEY level (level)) Engine=InnoDB;mysql> explain select id from hoge where level=2 order by id;+----+-------------+-------+------+-------+--------------------------+| id | select_type | table | type | key | Extra |+----+-------------+-------+------+-------+--------------------------+| 1 | SIMPLE | hoge | ref | level | Using where; Using index |+----+-------------+-------+------+-------+--------------------------+
    3. 3. mysql> select version();| 4.0.27-log |mysql> explain select id from hoge where level=2 order by id;+-------+------+-------+------------------------------------------+| table | type | key | Extra |+-------+------+-------+------------------------------------------+| hoge | ref | level | Using where; Using index; Using filesort |+-------+------+-------+------------------------------------------+1 row in set (0.00 sec)
    4. 4. my $sth = $dbh->prepare(“SELECT GET_LOCK(?,300)”);$sth->execute(q!injection”!)#110214 15:50:09 server id 53721 log_pos 803 Querythread_id=6 exec_time=0 error_code=0SET TIMESTAMP=1297666209;DO RELEASE_LOCK("injection””)

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