Re: Slow BLOBs restoring

От: Vlad Arkhipov
Тема: Re: Slow BLOBs restoring
Дата: ,
Msg-id: 4CFF46BD.8070004@dc.baikal.ru
(см: обсуждение, исходный текст)
Ответ на: Slow BLOBs restoring  (Vlad Arkhipov)
Ответы: Re: Slow BLOBs restoring  (Tom Lane)
Список: pgsql-performance

Скрыть дерево обсуждения

Slow BLOBs restoring  (Vlad Arkhipov, )
 Re: Slow BLOBs restoring  (Vlad Arkhipov, )
  Re: Slow BLOBs restoring  (Tom Lane, )
   Re: Slow BLOBs restoring  (Vlad Arkhipov, )
   Re: Slow BLOBs restoring  (Vlad Arkhipov, )
    Re: Slow BLOBs restoring  (Tom Lane, )

I discovered this issue a bit more. -j option is slowing down BLOBs
restoring. It's about 1000x times slower if you specify this option.
Does anybody plan to fix it?
> I have encountered a problem while restoring the database. There is a
> table that contains XML data (BLOB), ~ 3 000 000 records, ~ 5.5Gb of
> data. pg_restore has been running for a week without any considerable
> progress. There are plenty of lines like these in the log:
>
> pg_restore: processing item 3125397 BLOB 10001967
> pg_restore: executing BLOB 10001967
>
> CPU usage is 100% always. The total database size is about 100 Gb and
> it restores in an hour or so without BLOBs.
>



В списке pgsql-performance по дате сообщения:

От: Tom Lane
Дата:
Сообщение: Re: Slow BLOBs restoring
От: Bryce Nesbitt
Дата:
Сообщение: hashed subplan 5000x slower than two sequential operations