marmu mu at forsa.de
Wed Aug 24 04:03:37 PDT 2011
Hello guys,

yesterday I finally had slony replication working between two DBs on one
server. To this point in time I only had imported the globals and the
structure of the DBs. When I inserted a row in a table which is part of a
replication set it was immediately replicated. Then I thought it is time for
the next step: importing the (old) data backed up before.

At first I stopped the slons and disables all triggers in my DBs. After I
imported the data into both DBs the replication doesn't work anymore. Of
course I got some errors while importing data into the slave, since tables
are taking part in the replication:
"Table xxxxxxx is replicated and cannot be modified on a subscriber node -
role=0"

I thought, ok, I will have to import the data of the master-DB first and
then let slony replicate to the slave. But this didn't work. No replication
taking place and no errors in the slony logs.

The sl_status table in the master-DB is empty (0 rows), the sl_status table
in the slave-DB contains the following row (1 row, formatted for better
display):
 st_origin = 2 | st_received = 1 | st_last_event = 5002159114 |
 st_last_event_ts = 2011-08-24 12:31:37.56454 | st_last_received =
5002159114 |
 st_last_received_ts = 2011-08-24 12:31:38.598021 | 
 st_last_received_event_ts = 2011-08-24 12:31:37.56454 | st_lag_num_events =
0 |
 st_lag_time = 00:16:24.21951

Any hints on why the replication won't work after importing data would be
great. Further what would be the correct sequence of actions for moving 2
DBs from one server to a new one (new postgres and slony versions).

This is what I did:
1) export
    1.1) export globals
    1.2) export structure
    1.3) export data
2) import globals and structure
3) get slony working (replication was tested at this point and worked)
4) stop all slons (like "/etc/init.d/slony-slave stop" and
"/etc/init.d/slony-master stop")
5) disable all triggers (in our case some calculations based on the data are
taking place, but that is only needed while in production - so I could have
skipped this for now, but not in the future)
6) import the data (which was dumped before)

Thanks for your time, thoughts and help in advance.

Cheers,
Marcus
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