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复制中临时表的运用TIPS 我们知道，临时表有以下特性：1. SESSION 级别，SESSION 一旦断掉，就被自动DROP 了。2. 和默认引擎有关。如果默认引擎是INNODB，而你又疯狂的使用临时表。那么，你的IBDATA会被无限的增大。3. 和磁盘表一样，默认写入到binlog, 而且被动的加入了rollback 计划。 幻想如下场景：数据库损坏，也没有备份。刚好二进制日志全部保存完好，幸福了。导入二进制日志到MYSQL。
有两种方法： 1） mysqlbinlog ..... *.log | mysql dbname; 这种利用管道直接恢复数据，时间短，效率高。 可里面如果有一堆的临时表，而且刚好在日志的中间，那么悲剧了， 导入失败。 （回想临时表的特性就知道了。） 2） mysqlbinlog ..... *.log > result.log;mysql dbname [sql] SET SQL_LOG_BIN=0; 关掉SESSION级别的复制。 update tmp_t1, tmp_t2 set ....; drop tmp_t1; drop tmp_t2; SET SQL_LOG_BIN=1; 打开SESSION级别的复制。
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MySQL: How to avoid String Data Types common mistakes?May 13, 2025 am 12:09 AMToavoidcommonmistakeswithstringdatatypesinMySQL,understandstringtypenuances,choosetherighttype,andmanageencodingandcollationsettingseffectively.1)UseCHARforfixed-lengthstrings,VARCHARforvariable-length,andTEXT/BLOBforlargerdata.2)Setcorrectcharacters
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