Tabish Sarwar <tabish.sarwar at gmail.com> writes:
> means that ...i m trying to modify things at the subsribed node ..i
> mean the slave node...U said slave node is "query only" ...did i
> interpret the things right ?

Yes, that's right.  

If you are trying to modify the data on a "subscribed" or "slave"
node, Slony-I prevents that using a trigger that it puts onto
subscribed tables.

You can read/query data on the slave nodes as much as you like; if you
try to modify the data in replicated tables, Slony-I will stop you
from doing so.
-- 
"cbbrowne","@","ca.afilias.info"
<http://dev6.int.libertyrms.com/>
Christopher Browne
(416) 673-4124 (land)