[postgis-users] simplify crashing postgres on larger table

[ivan minčík]

I tried to compile the newest version of postgis, but the result is the 
same. I am  going to start looking for that wrong geometry

Paul Ramsey wrote:
> Where I used 'sizeof' I meant 'mem_size'...
>
> On 15-Oct-07, at 2:36 PM, Paul Ramsey wrote:
>
>> Well, you have a bug in your sights, probably, but you haven't 
>> isolated it...
>> First, is it the UPDATE or the function?
>> Does
>>   SELECT sizeof(simplify(the_geom,500)) FROM thetable
>> crash the backend?
>>
>> If it's the function, then, it's either the number of features and 
>> bad luck with a memory leak, or a single geometry that crashes the 
>> function.  Find out if it's the geometry by repeatedly dividing your 
>> data set into halves and checking each half separately.  If one half 
>> keeps failing, you'll eventually winnow it down to the offending 
>> geometry, and you can report that back here and the fix should be 
>> "easy".
>>
>> P.
>>
>>
>>
>> On 15-Oct-07, at 12:17 PM, ivan minčík wrote:
>>
>>> Halo postgis users,
>>> I found that this query:
>>>
>>> UPDATE table SET the_geom500=simplify(the_geom,500);
>>>
>>> is crashing postgres database on 2 GB table. On smaller table 
>>> everything is OK.
>>>
>>> I have tested this on 2 Debian Etch stable computers (postgresql and 
>>> postgis from repositories).
>>> after some 5 minutes I always get
>>>
>>> server closed the connection unexpectedly
>>>        This probably means the server terminated abnormally
>>>        before or while processing the request.
>>> The connection to the server was lost. Attempting reset: Failed.
>>>
>>>
>>> in log there is
>>>
>>> 2007-10-15 21:08:47 CEST LOG:  server process (PID 5234) was 
>>> terminated by signal 11
>>> 2007-10-15 21:08:47 CEST LOG:  terminating any other active server 
>>> processes
>>> 2007-10-15 21:08:47 CEST LOG:  all server processes terminated; 
>>> reinitializing
>>> 2007-10-15 21:08:47 CEST FATAL:  the database system is starting up
>>> 2007-10-15 21:08:47 CEST LOG:  database system was interrupted at 
>>> 2007-10-15 21:08:40 CEST
>>> 2007-10-15 21:08:47 CEST LOG:  checkpoint record is at 1/5BCE111C
>>> 2007-10-15 21:08:47 CEST LOG:  redo record is at 1/5B546840; undo 
>>> record is at 0/0; shutdown FALSE
>>> 2007-10-15 21:08:47 CEST LOG:  next transaction ID: 45777; next OID: 
>>> 131584
>>> 2007-10-15 21:08:47 CEST LOG:  next MultiXactId: 1; next 
>>> MultiXactOffset: 0
>>> 2007-10-15 21:08:47 CEST LOG:  database system was not properly shut 
>>> down; automatic recovery in progress
>>> 2007-10-15 21:08:47 CEST LOG:  redo starts at 1/5B546840
>>> 2007-10-15 21:08:50 CEST LOG:  invalid magic number 0000 in log file 
>>> 1, segment 98, offset 15826944
>>> 2007-10-15 21:08:50 CEST LOG:  redo done at 1/62F17F90
>>> 2007-10-15 21:08:55 CEST LOG:  database system is ready
>>> 2007-10-15 21:08:55 CEST LOG:  transaction ID wrap limit is 
>>> 2147484146, limited by database "postgres"
>>>
>>> Does anybody knows what is going on?
>>> thanks Ivan
>>>
>>>
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>>
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