sascha mantscheff wrote:

> Ihre Nachricht vom Friday 18 January 2002 12:14:
> 
>>sascha mantscheff wrote:
>>
>>>I'm not using replication, but for a test if it really works I would do
>>>some data manipulations on the master and afterwards a complete mysqldump
>>>of master and replica and diff the result.
>>>
>>ok, this is an new and interesting idea, has anyone an idea how long it
>>can take to diff two mysqldumps of 300 mb on a AMD 600 with 196 MB RAM?
>>
>>henning
>>
> 
> does it matter? 


shure it does. first to say, it wasn't meant as a critical question, but 
as an informal question.
it matters in the way that it is impractical if machines of this size 
just crash when trying such a diff (i accidentally opened such a file in 
vim, that was no fun!) or when the diff takes a week or so.


> try it on some smaller tables first, then on the big ones, 
> then on the whole bunch. it will take much less time then to fix any problems 
> afterwards, in case that replication doesn't work as expected.




hmm, maybe, but maybe not, if diffs of this size would take a week
i could only test it once and would then rely on the mysql error mechanism.
if i'd insist in doing consistency checks on a regular basis i would 
maybe better try the "old way" of backup and zipping the datafiles once 
in a while...


henning


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