Re: Online Backup and WAL archives

Hi Tom,

    If I want to restore to a particular point in time lets say to the
point in time like a day back when one of my table was dropped
accidentally and if i want restore the archive log only to that
particular archive log file . what is the procedure we should follow ?
just keep the archive logs in the directory until the last archive log
file i need or is there a command something like  " restore only until
at this archive log file " ?   Also what happens to the transaction log
files in pg_xlog directory in this scenario ? do i have to still keep
them or they get created by themself since i am going a day back ?

  Is this possible in postgres 8

Thanks,
Pallav


Tom Lane wrote:

>Morus Walter <morus.walter@tanto.de> writes:
>
>
>>The documentation says
>>' To make use of this backup, you will need to keep around all the
>>WAL segment files generated at or after the starting time of the backup. '
>>Now I'm wondering how much of these WAL segment files do I really need
>>in order to recover the databases to a consistent state.
>>
>>
>
>If you are satisfied with recovering to the state shortly after you
>completed the backup, then it would be sufficient to have a set of WAL
>files spanning the time period in which the backup is done.  I'm dubious
>that this is necessarily an improvement over a pg_dump backup, though.
>
>
>
>>I expect the online backup to faster on recovery than an SQL dump, since
>>the latter would imply recreation of indexes during recovery.
>>
>>
>
>Is that assumption founded on any hard evidence?
>
>            regards, tom lane
>
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