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Percona Server 5.1.47-11.0 版本发布没几天(6-21)，因发现一个严重的bug，又对该版本召回，为此 Percona 重新发布了一个 11.1 的补丁版本(6-29)。 该版本是关于查询缓存的，下面是对该bug的详细描述： MySQL Query Cache works by checking incoming queries if they may be found in query cache – this is done by performing simple check if query is starting from SEL or comment. After Query is parsed and executed MySQL stores results for SELECT queries in Query Cache. There are cases when queries will not be considered as cachable query during first check, however result for them will be stored in the query cache. This rare case was not handled properly in the new feature added and it was causing MySQL to crash. The most typical case for queries causing issues would be queries starting with brackets such as ( select * from t1 ) Queries starting with brackets are often used with UNION queries. 今天下午下载了新发布的版本11.1的源代码，编译 ./configure --with-charset=gbk --with-extra-charsets=all --enable-local-infile --enable-thread-safe-client --enable-assembler --with-plugins=innobase,partition --prefix=/home/ddb/wangwei/mysql-5.1.47-xtradb-net --with-big-tables --with-readline 正常，后来进行系统库初始化（mysql_install_db）的时候，出现错误，所无法识别参数，我靠，那说明根本就没有安装成功XtraDB 嘛。 100630 17:48:33 [ERROR] /home/ddb/wangwei/mysql-5.1.47-xtradb-net/libexec/mysqld: unknown variable 'innodb_data_home_dir=/home/ddb/wangwei/xtradb-data/mysql' 同样的编译命令，安装MySQL-5.1.45+Xtradb-1.0.6就没有这个问题。看来是源码包的问题了，也有人遇到类似的问题。http://forum.percona.com/index.php/m/5874 /#msg_5874 。 不甘心，后来改变下编译参数，把--with-plugins=innobase,partition ---》--with-plugins=max ,继续编译，编译成功，系统库初始化没有异常，汗。启动MySQL，登录之，正常：
mysql> status -------------- /home/ddb/wangwei/mysql-5.1.47-xtradb-net/bin/mysql Ver 14.14 Distrib 5.1.47, for unknown-linux-gnu (x86_64) using readline 5.1 Connection id: 1 Current database: Current user: root@localhost SSL: Not in use Current pager: stdout Using outfile: '' Using delimiter: ; Server version: 5.1.47-log Source distribution Protocol version: 10 Connection: Localhost via UNIX socket Server characterset: utf8 Db characterset: utf8 Client characterset: utf8 Conn. characterset: utf8 UNIX socket: /home/ddb/wangwei/xtradb/mysql/mysqld.sock Uptime: 27 sec Threads: 1 Questions: 7 Slow queries: 0 Opens: 15 Flush tables: 1 Open tables: 8 Queries per second avg: 0.259 -------------- mysql> show engines ; +------------+---------+----------------------------------------------------------------+--------------+------+------------+ | Engine | Support | Comment | Transactions | XA | Savepoints | +------------+---------+----------------------------------------------------------------+--------------+------+------------+ | ndbcluster | NO | Clustered, fault-tolerant tables | NULL | NULL | NULL | | MRG_MYISAM | YES | Collection of identical MyISAM tables | NO | NO | NO | | BLACKHOLE | YES | /dev/null storage engine (anything you write to it disappears) | NO | NO | NO | | CSV | YES | CSV storage engine | NO | NO | NO | | MEMORY | YES | Hash based, stored in memory, useful for temporary tables | NO | NO | NO | | FEDERATED | NO | Federated MySQL storage engine | NULL | NULL | NULL | | ARCHIVE | YES | Archive storage engine | NO | NO | NO | | InnoDB | DEFAULT | Supports transactions, row-level locking, and foreign keys | YES | YES | YES | | MyISAM | YES | Default engine as of MySQL 3.23 with great performance | NO | NO | NO | +------------+---------+----------------------------------------------------------------+--------------+------+------------+ 9 rows in set (0.00 sec) mysql> show variables like 'innodb_version'; //默认版本就是XtraDB了 +----------------+------------+ | Variable_name | Value | +----------------+------------+ | innodb_version | 1.0.8-11.0 | +----------------+------------+ 1 row in set (0.00 sec) mysql> show variables like 'innodb_adaptive_checkpoint'; +----------------------------+----------+ | Variable_name | Value | +----------------------------+----------+ | innodb_adaptive_checkpoint | estimate | +----------------------------+----------+ 1 row in set (0.00 sec)
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