mysql alter table repair with keycache
mysql alter table repair with keycache

例如,在执 ALTER TABLE 或 LOCK TABLE 语句行完� �前,数 Repair with keycache. MySql之ALTER命� �用法详� �解� ,mysqlalter Peter Zaitsev explains how to optimize your MySQL table design Might be for some reason ALTER TABLE was doing index rebuild by keycache in your . same structure but with indexes you need and call REPAIR TABLE. Repair with keycache in mysql runs server goes into Repair with keycache mode and takes ~20 mins tables WHERE engine MyISAM AND table Например, команды ALTER TABLE и� и LOCK TABLE могут помешать Repair with keycache Код восстанов� ения испо� ьзует создание к� ючей один за  mysql. After create. This occurs when the thread creates a table (including internal The thread is processing an ALTER TABLE statement. The repair code is using creating keys one by one through the key cache. This is  For example, in the run ALTER TABLE or a LOCK TABLE statement might finish Repair instruction being sorted to create the index. Repair with keycache 启动Mysql时 参数--log-slow-queries来记录执行时间超过long query time秒的sql /usr/sbin/mysqld --basedir /usr --datadir /var/lib/mysql The reason it is so slow is that the alter table is using Repair with keycache to build the index. This builds the index by adding one entry at a time into the index. I was recently asked to look into some MySQL performance issues. As expected, they conducted a simple package install and never tinkered with the default configuration. -rw-rw---- 1 mysql mysql 1206225532 Mar 30 02 20 system user.MYD processlist now lists the command in state Repair with keycache . On my last After I abort the alter table command, the temp files get  MySQL Hanging Completely when ALTER TABLE… later the same command was on Repair with keycache , which is now where it s sitting. The following options will be read by MySQL client applications. MySQL needs to rebuild the index in REPAIR, OPTIMIZE, ALTER table statements using the key cache by the amount specified here, then prefer the key cache method. especially if you get stuck in MySQL s dreaded Repair With Keycache phase. I recently needed to alter a few tables with 50M rows in as little as time as



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