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<p><FONT class=normalfont><B><font color=blue>MySQL从3.23升级到4.0四部曲</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者:作者<br>来自:Linux知识宝库<br>联系方式:无名<br><br>MySQL 4.0 已经成为生产版本,也就是说可以在生产环境中使用了。一个速度更快,更加稳定,更加安全的 MySQL 值得众多 DBA 的青睐。 新版本支持查询缓冲,全文搜索,UNION 等等,并为升级到 4.1 甚至 5.0 打好了基础。<br>
<br>
从 3.23 升级到 4.0 只需要简单的 4 个步骤:<br>
<br>
1、运行脚本 mysql_fix_privilege_tables ,增加新的权限配置<br>
2、修改启动脚本,去掉那些不再使用的选项<br>
3、用命令: mysql_convert_table_format database 把老的 ISAM 文件转化为 MyISAM 格式,如果并非所有的表为 ISAM,或全部转换为 MyISAM,需要用 ALTER TABLE table_name TYPE=MyISAM 来转换所有的 ISAM 格式的表。<br>
4、确保所有客户端软件没有使用共享库,例如:Perl DBD-mysql。否则需要重新编译,因为 libmysqlclient.so 的结构有变。对 Python MySQLdb 也一样。<br>
<br>
即使不对以上步骤不闻不问,MySQL 4.0 依旧可以正常工作,但是将不能用到 4.0 中的新的安全特色,在升级到更新版本的 MySQL 4.1 的时候会碰到问题。ISAM 格式的文件依旧能在 4.0 中工作,但是在 5.0 中将不再采用。老的客户端软件能继续和 4.0 版本的服务器正常工作。<br>
<br>
当在 4.0 中遇到问题时,就算作了上述工作,还可以降低到 3.23.52 或更新版本。在这种情况下,需要对那些有全文索引的表用 mysqldump 备份,然后在 3.23 中恢复数据,因为 4.0 采用了新的全文索引格式。
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