Re: Could I disable redo log in SSD?
Posted by:
feng guo
Date: August 01, 2014 08:33PM
Rick James Wrote:
-------------------------------------------------------
> You will lose your intellectual argument.
>
> > so data is durable all time.
>
> That is valid only for atomic, single-row,
> operations.
>
> Example 1:
> UPDATE ... WHERE many-rows-involved
>
> Example 2:
> BEGIN
> INSERT
> INSERT
> UPDATE
> DELETE
> COMMIT
>
> There are many situations where multiple IOPs have
> to occur to complete the entire "transaction".
> Even with a fast SSD, it is very possible to crash
> mid-way through the writes. InnoDB's logs are
> designed to recover (all or none -- 'atomically')
> regardless of when the crash occurs.
>
> Even taking your side of the argument ("SSDs are
> so fast..."), then why worry about writing to the
> logs, since "SSDs are so fast...".
If something wrong happen during update many rows,it could undo appled changes~I just mean disable redo,not undo~
I just think redo is redundant.........
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