Re: [GENERAL] Recovering data from corrupted table. Urgent Help!!
ruben wrote: Hi Gaetano: This procedure to recover data from a corrupted table should be documented somewhere... If it is, I could not find it! First of all the table was not corrupted, the glitch was in another subsystem. The procedure is documented in the archives :-( I agree with you but any cure seems worst then the disease. You have understand why the file 0004 was not anymore there, did you had a power failure for example ? Now I wonder if I have lost any data, because after creating the pg_clog/0004 and running VACCUM everything seems ok. Normally you didn't lost any data. Regards Gaetano Mendola PS: I had the same error for the first time in my postgres usage life only after ( some weeks after ) having upgrade from a 7.4.2 - 7.4.5 ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
Re: [GENERAL] Recovering data from corrupted table. Urgent Help!!
[EMAIL PROTECTED] wrote: Hi: Is there any way to recover data from a corrupted table? I can only run SELECTs on certain WHERE conditions. I cannot vacuum, pg_dump, I've deleted the indexes and try to reindex, always get error: ERROR: could not access status of transaction 4244329 DETAIL: could not open file /usr/local/pgsql/data/pg_clog/0004: No existe el fichero o el directorio Thanks a lot. Again: create an empty file: # touch /usr/local/pgsql/data/pg_clog/0004 at this point postgres will complain about the fact that an offset is missing, at this point fill with 0 your file ( blocks of 8K ) till reach that offset reclaimed. Regards Gaetano Mendola ---(end of broadcast)--- TIP 4: Don't 'kill -9' the postmaster
Re: [GENERAL] Recovering data from corrupted table. Urgent Help!!
Gaetano Mendola wrote: [EMAIL PROTECTED] wrote: Hi: Is there any way to recover data from a corrupted table? I can only run SELECTs on certain WHERE conditions. I cannot vacuum, pg_dump, I've deleted the indexes and try to reindex, always get error: ERROR: could not access status of transaction 4244329 DETAIL: could not open file /usr/local/pgsql/data/pg_clog/0004: No existe el fichero o el directorio Thanks a lot. Again: create an empty file: # touch /usr/local/pgsql/data/pg_clog/0004 at this point postgres will complain about the fact that an offset is missing, at this point fill with 0 your file ( blocks of 8K ) till reach that offset reclaimed. I forgot to suggest you to do: dd bs=8k count=1 /dev/zero /usr/local/pgsql/data/pg_clog/0004 you have to repeat this command till the offset is covered. Regards Gaetano Mendola ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html
Re: [GENERAL] Recovering data from corrupted table. Urgent Help!!
Create a file with that name filled with zeros with the same length as the other files in that directory. That should get you far enough to dump the data. Then run a complete set of memory and disk checks on your system... On Wed, Oct 13, 2004 at 02:56:37PM +0100, [EMAIL PROTECTED] wrote: Hi: Is there any way to recover data from a corrupted table? I can only run SELECTs on certain WHERE conditions. I cannot vacuum, pg_dump, I've deleted the indexes and try to reindex, always get error: ERROR: could not access status of transaction 4244329 DETAIL: could not open file /usr/local/pgsql/data/pg_clog/0004: No existe el fichero o el directorio Thanks a lot. ---(end of broadcast)--- TIP 5: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faqs/FAQ.html -- Martijn van Oosterhout [EMAIL PROTECTED] http://svana.org/kleptog/ Patent. n. Genius is 5% inspiration and 95% perspiration. A patent is a tool for doing 5% of the work and then sitting around waiting for someone else to do the other 95% so you can sue them. pgpOOY3ikI4zN.pgp Description: PGP signature
Re: [GENERAL] Recovering data from corrupted table. Urgent Help!!
Hi Gaetano: This procedure to recover data from a corrupted table should be documented somewhere... If it is, I could not find it! Now I wonder if I have lost any data, because after creating the pg_clog/0004 and running VACCUM everything seems ok. Thanks a lot for your help. Ruben. Gaetano Mendola wrote: [EMAIL PROTECTED] wrote: Hi: Is there any way to recover data from a corrupted table? I can only run SELECTs on certain WHERE conditions. I cannot vacuum, pg_dump, I've deleted the indexes and try to reindex, always get error: ERROR: could not access status of transaction 4244329 DETAIL: could not open file /usr/local/pgsql/data/pg_clog/0004: No existe el fichero o el directorio Thanks a lot. Again: create an empty file: # touch /usr/local/pgsql/data/pg_clog/0004 at this point postgres will complain about the fact that an offset is missing, at this point fill with 0 your file ( blocks of 8K ) till reach that offset reclaimed. I forgot to suggest you to do: dd bs=8k count=1 /dev/zero /usr/local/pgsql/data/pg_clog/0004 you have to repeat this command till the offset is covered. Regards Gaetano Mendola ---(end of broadcast)--- TIP 8: explain analyze is your friend
