Cami Sardinha wrote:
> Tobias Kreidl wrote:
>> The issue of having the LIMIT set, period, instead of it being an option
>> is a concern.
>> If one ever gets behind, ti would appear that depending on the load,
>> you'd never catch up.
>>
>> Your point was that there are times where you might actually deal with
>> over 100,000 messages within an hour and
>> if that's sustained over a few hours, the cleanup will never catch up
>> (unless it's aware that it hit the limit and is started
>> up again). So, I agree with your concern about the LIMIT being
>> implicitly set and would suggest that this could perhaps at least be
>> overridden through a command line variable.
>
> Please, if you're going to read the source code, at least do a thorough
> job of it. Do NOT change the MySQL queries until you understand exactly
> what is happening and why.
>
> There is NO limit of 100 000, read the source code properly.
To be more specific, follow from function to function:
cleanup.c -> mysql.c -> db_deletequery();
db_deletequery()
..
count=0;
..
start:
..
/* fire off query */
if (w_mysql_query(fd, "db_deletequery") != 0)
..
/* MySQL does not handle extremely large deletes very well */
if((int)mysql_affected_rows(mysql) == 100000)
{
count=count+(int)mysql_affected_rows(mysql);
goto start;
^^^^^^^^^^^
|
Re-run the delete query if we hit up against the 100 000 limit
as this gives MySQL a small "breather" window. (Keep re-running
the delete query until there is less than 100 000 rows deleted)
Running cleanup in DEBUG=3 mode shows you what is happening
in step-by-step detail.
Cami
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