On 09/17/2015 11:15 PM, Guillaume Lelarge wrote:
Le 18 sept. 2015 5:23 AM, "Adrian Klaver" <adrian.kla...@aklaver.com
<mailto:adrian.kla...@aklaver.com>> a écrit :
>
> On 09/17/2015 05:37 PM, Michael Chau wrote:
>>
>> 1)
>>
>> In Production, I have a DB2 which is replicated partially using
Londiste
>> from DB1.
>>
>>
>> Well I think the above needs more explanation to help understand how the
>> DB2 backup got into this state and possibly prevent it in the future.
>>
>> A: So, the DB1 has several schemas in the database. We use Londiste to
>> replicate just one of the schemas to DB2. The table in question is in
>> that schema. Backup is done on both DB1 and DB2.
>>
>> 2)
>> I make file-system backups nightly on both DBs.
>>
>> How is that done exactly?
>>
>> A: To backup:
>>
>> 1) pg_start_backup()
>> 2) tar up the files under the data directory
>> 3) pg_stop_backup()
>>
>> To restore on test server:
>>
>> 1) Just untar the tar ball, then start up Postgres. Of course the data
>> directory is empty beforehand.
>>
>> This has been working for almost 2 years without any problem until last
>> Monday. I remember that I just ran vacuum analyze that table on both DB1
>> and DB2 that morning. But, I don't think that it harms anything.
>
>
> Well it looks fairly straight forward, to me at least.
>
Do I miss something obvious? Because this is to me the wrong way to do
the restore. You need to apply WAL files archived between
pg_start_backup and pg_stop_backup to get consistent data files.
Would that not be taken care of by the tar data directory/ untar data
directory?
I would think if it was a WAL issue the OP could never get the server to
start and get to the point the query failed on a single table and
column. All that being said, I think the OP would be better served by
pg_basebackup:
http://www.postgresql.org/docs/9.4/static/app-pgbasebackup.html
--
Adrian Klaver
adrian.kla...@aklaver.com
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