Question about wal files / pg_xlogs

[Patrick B <patrickbakerbr@xxxxxxxxx>]

Hi all,

I'm currently using PostgreSQL 9.2. I noticed that the wal_files are being generated by the master well, no problems. But on the slaves, it seems to be a delay to the delivery of those wal_files.

I got two slaves using streaming replication and wal files shipment from Master.

On the master:

ls -ltr /var/lib/pgsql/9.2/data/pg_xlogs/
Aug  4 02:18 000000020000159D000000D1
Aug  4 02:18 000000020000159D000000D2
Aug  4 02:18 000000020000159D000000D3

select * from pg_current_xlog_location();
159D/D6C8DAF8

So, seems to be ok.

On the slave:

ls -ltr /var/lib/pgsql/9.2/wal_archive:
Aug  4 00:58 000000020000159C00000071
Aug  4 00:58 000000020000159C00000072
Aug  4 00:58 000000020000159C00000073

See the time difference? 2 hours? It seems the files are being delivered with 2 hours delay.

The streaming replication is working fine... But if that goes down, I'll need the wal_files up to date to recover the database.

How can I see what's going on? What would be the steps? any tips?

Cheers

Patrick.