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Optimal index size for variable text in MySQL xarg.org 17 Jul 2012 | 01:58 am

You often see databases with huge dynamic text fields, such as VARCHAR(255), TEXT, or as I recently was allowed to see the blanket use of LONGTEXT (max 4GiB) in order to be invulnerable from all conti...

MySQL Innodb数据库性能实践——VARCHAR vs CHAR ourmysql.com 9 Aug 2013 | 04:45 am

   学过数据库理论的读者,都应该还记得关于CHAR和VARCHAR的性能对比:CHAR比VARCHAR更快,因为CHAR是固定长度的,而VARCHAR需要增加一个长度标识,处理时需要多一次运算。 针对这种情况,我做了一下基准测试,基准测试环境如下: 【硬件配置】 硬件 配置 CPU Intel(R) Xeon(R) CPU E5620 主频2.40...

Gesamte MySQL-Datenbank nach einer Zeichenkette durchsuchen xonu.de 25 Mar 2013 | 11:52 pm

In SQL/MySQL gibt es keinen Befehl mit dem die gesamte Datenbank durchsucht werden könnte. Denkbar wäre eine Prozedur, die alle Tabellen mit Spalten relevanter Datentypen (u. a. VARCHAR, CHAR, TEXT) d...

MySQL Performance: # of columns vs varchars ender.com 9 Oct 2009 | 12:20 pm

I have long told fellow developers that trying to stick to tables that have entirely fixed width columns is good practice. This tends to lead to, at the least, normalizing out text on a performance s...

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