MySQL 4.0升級(jí)到5.1遇到問(wèn)題及解決

1、數(shù)據(jù)庫(kù)數(shù)據(jù)量暴增,對(duì)比其他業(yè)務(wù)類似的數(shù)據(jù)庫(kù)發(fā)現(xiàn)某個(gè)表的數(shù)據(jù)量異常,最后確定了一個(gè)重復(fù)遷移數(shù)據(jù)的bug...

120301 17:30:43 [ERROR] Column count of mysql.db is wrong. Expected 22, found 15. The table is probably corrupted

120301 17:30:43 [ERROR] mysql.user has no `Event_priv` column at position 29-
 

120301 17:30:43 [ERROR] Event Scheduler: An error occurred when initializing system tables. Disabling the Event Scheduler.

2、MySQL 4.0升級(jí)5.1 SA工程師在寫自動(dòng)腳本shi忘記./bin/mysql_upgrade  -u root -p --sock=/tmp/mysql5.sock了

3、以前使用MyISAM引擎的時(shí)候,多線程update往往會(huì)把表壓壞,最近在insert的時(shí)候也發(fā)送了表?yè)p毀,最后鎖定insert tablename values select ....... union all select .......,會(huì)帶來(lái)表?yè)p毀的問(wèn)題,拆開,一個(gè)一個(gè)insert,就沒(méi)問(wèn)題了

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