Is there any penalty for repeatedly doing
SAVEPOINT eugene
without a corresponding
RELEASE SAVEPOINT
?
In my case, I have a table with a unique index constraint. Multiple
processes will be trying to "create or lookup" a record, so trapping the
unique index constraint seems the most robust way to detect if the record
already exists. The overall structure I'm using (in pseudo-Ruby syntax):
begin
response = execute("SAVEPOINT eugene;
INSERT INTO symbols (name) VALUES
('#{name}') RETURNING id")
rescue
# arrive here on a constraint violation if the name already existed
response = execute("ROLLBACK TO SAVEPOINT eugene;
SELECT id FROM symbols WHERE symbols.name =
'#{name}'")
ensure
# is this RELEASE strictly required?
execute("RELEASE SAVEPOINT eugene")
end
(On a related note, would I be better off using advisory locks? And would
that be sufficient in the face of multiple processes?)
--
View this message in context: http://postgresql.1045698.n5.nabble.com/multiple-SAVEPOINTs-without-RELEASE-SAVEPOINT-tp5716594.html
Sent from the PostgreSQL - general mailing list archive at Nabble.com.
--
Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-general
