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È«¼øÅ (javahong) ´Ô²² º¸³»½Å ¸ÞÀÏ <Re: about innodb_flush_log_at_trx_commit>
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--- Begin Message ---
On Wed, Jan 30, 2002 at 03:06:36PM -0800, Joseph Drozdik wrote:
> Hi all,
>
> I've been looking at the performance of mysql using innodb tables
> and I've noticed that I can get a huge benifit by setting
> innodb_flush_log_at_trx_commit = 0. The documentation warns me that
> I can loose a couple of seconds of transactions in system crash if I
> do this.
>
> It seems like a great tradeoff but the question is, is there any way
> that this delayed flushing can cause multi-query transactions to be
> only half-flushed. Loosing some transactions is ok but loosing half
> of one would be unnacceptable.
The whole point of transactions is that there is not such thing as
"half a transaction" from the database's point of view. If the server
dies and it must used the transaction log to playback transactions
upon restart, it will only play back committed transactions.
Jeremy
--
Jeremy D. Zawodny, <[EMAIL PROTECTED]>
Technical Yahoo - Yahoo Finance
Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936
MySQL 3.23.41-max: up 27 days, processed 620,964,155 queries (256/sec. avg)
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