On jue 05 dic 2013 16:19:14 ART, Michael Bayer wrote:
also note if you really want to prevent disconnects at the top of a
transaction, you can use a pessimistic approach, see
http://docs.sqlalchemy.org/en/rel_0_9/core/pooling.html?highlight=pessimistic#disconnect-handling-pessimistic
.
thanks so much for your quick answer. I will review this option and
evaluate if I can use it.
On Dec 5, 2013, at 11:05 AM, Michael Bayer <mike...@zzzcomputing.com> wrote:
On Dec 5, 2013, at 10:54 AM, Mariano Mara <mariano.m...@gmail.com> wrote:
Hi there, in one application I am using sqlalchemy 0.7.8 against Oracle 11
release 1 and I am hitting Oracle's lost contact more times than I would like
to. Since the app seems unable to recover from the error, I have to restart it
completely (it is a pyramid app).
According to this changeset[1], the error ORA-03135 (connection lost contact)
is included in the expected disconnection errors from oracle since 0.7.5 and
my expectation would be that sqlalchemy would be able to recover from such
error gracefully. Did I misunderstand how it works? Should I take actions im my
app when I somehow detects this situation?
TIA,
Mariano
[1]
http://www.sqlalchemy.org/trac/changeset/dfb0b6aa622006e1e71a5296c3fa17667e24aac1/
it will recover in that when you catch this exception, then continue to use
that Connection, it will know that it needs to reconnect with a fresh DBAPI
connection. the underlying connection pool is also dumped when this exception
is encountered.
it’s not possible for the Connection to transparently retry the operation with
a new DBAPI connection without raising an error because connection session
state is lost. e.g. if it occurs in the middle of a result set, the results
are gone, occurs in the middle of a transaction, everything in the transaction
is gone, etc.
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