Jessica Richard wrote:
I need to joint select from table A in the current database A and dblink
to table B in database B, the result coming from tableB in db B is very
slow because I have to select all the rows from tableB from dblink then
do "where" with table A in the current db....doing dblink this way is
very very slow....
Any idea on how to improve this?
About the only thing I can think of using dblink would be to use a
PL/pgSQL function to dynamically build and execute your query in such a
way that the WHERE clause is pushed to the remote query.
Someone else suggested dbi-link as an alternative -- I don't know for
sure, but suspect it will suffer from the same issue as dblink.
I also saw a suggestion of using different schemas instead of different
databases. This is the best solution if it is feasible.
Finally, I don't know much about it, but perhaps PL/proxy would make it
easier to push down your WHERE clause:
https://developer.skype.com/SkypeGarage/DbProjects/PlProxy
HTH,
Joe
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
