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IDS Forum

Re: Archive detects that page x:xxxxx is corrupt

Posted By: Emiliano Romero
Date: Tuesday, 29 July 2008, at 10:29 a.m.

In Response To: Re: Archive detects that page x:xxxxx is corrupt (tilleul17@web.de)

Thanks!, I have remove the index with:
alter table <table> DROP CONSTRAINT <uxxx_xxx>
and then just recreate with:
alter table <table> ADD CONSTRAINT PRIMARY KEY (<tableid>)

It took like 1 hour to recreate the index, but now it works perfect.

I just have to add more space for physical logs because my DB is "NO
LOGGING".

Thanks for your help.

Regards

Emiliano Romero

tilleul17@web.de wrote:
> Emiliano Romero wrote:
>
>> I run oncheck -cID in the production enviroment and get the following:
>> Validating indexes for db:informix.table...
>>
>> Index 146_117
>>
>> Index fragment partition datadbs1 in DBspace datadbs1
>> Could not bfget pagenum 0x138374, iserrno 105
>> ISAM error: bad isam file format.
>> ERROR: Index 146_117 for db:informix.table is bad.
>>
>> Index idx_chst
>>
>> Index fragment partition datadbs1 in DBspace datadbs1
>>
>> Is that error being fixed with oncheck utility?
>>
>
> oncheck should as you something liek 'Ok to repair?'
> if it did and you answered yes , it will have dropped and recreated the
> index, the corruption will be gone then.
> However, if you di not answer y or yes, it is probably still bad. In
> that case I suggest to not use oncheck to repair the corrupt index but
> to drop it and recreate it maually (with PDQPRIORITY set to 100 and
> loads od DS_TOTAL_MEMORY configured (up 90 % of SHMVIRTSIZE)
>
> ....
>
>
>>> Then, after a lot of those lines the backup finish with:
>>> 12:11:17 Archive on rootdbs, datadbs, physdbs, datadbs2, datadbs1
>>> Completed with 137 corrupted pages detected
>>>
>>> Like I see in the logs i have some wrong data in my chunk 6 in page
>>> 6278896. I have check and I have one Table in that chunk. If I do a
>>> select count(*) from table I get like the half of the rows I SHOULD have.
>>>
>>> I restore that backup in my development server and run oncheck -cID
>>> database:informix.table, it took like 20 minutes but no luck.
>>>
>
> What you mean No luck : oncheckk did not finish or not reprot any errors?
>
>>> I have some questions about this issue.
>>> 1) If I restore that backup in another server. Can I try fixing in that
>>> server before try in production? Or the backup is restore *without*
>>> corrupted pages?
>>>
>
>
>>> 2) Is there another way to deal with this problem?
>>>
>
> I'd try and drop the bad index of the table - it seems to be bad.
> Afterwards run oncheck -cD <database>:<table>
> Doe it still report errors ?
> if not , go recreate the index (i hope you saved the schema beforehand
> with dbschema -d <db> -ss -t <table>
>
> If yes - try to find the nature AND root cause of the corruption .
> IBM Informix Tech support can help.
> Also hae a look at the af-files in case any got generate dduring archive
> or when accessing the bad pages.
>
>
>>> Thanks in advice and sorry about my really bad English.
>>>
>>>
>>>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
>

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