Re: Subject: Batch load freezes every couple of minutes

>Instance runs 20 parallel load processes

You might be encountering enqueue waits. Typically INITRANS=3D1 for tables & 2 for indexes (YMMV). Unless & until the session holding the Interested Transaction Lock releases it, other sessions will quietly get into line waiting for it to be released. This is NOT a deadlock & won't be reported as one.

HTH & HAND! On 4/17/05, ryan_gaffuri_at_comcast.net <ryan_gaffuri_at_comcast.net> wrote:
> Please provide your definition of 'hang'? To see if your processes are st=
ill running look in v$sess_io, if the values there are incrementing, then p= rocessing is still going on.
> you need to find out what the processes are doing at the point that they =
are freezing? Best way is to get a 10046 trace of one of the processes dump= ed to a file. Another alternative is to use statspack of before the 'hang' = and then another snapshot afterward and look at what sql is processing.
>=20
> you mentioned that the times that you have problems are when you have loc=
k waits. you could have 1 process doing something for a long time and aquir= ing a lock on a row. the rest of the processes require that row and have to=  wait for a commit or rollback.
>=20
> the v$ tables(other than a quick look at v$sess_io) probably won't be hel=
pful here. you need to know exactly what is going on when this occurs.
>=20
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