Alvaro Herrera <alvherre@dcc.uchile.cl> writes:
> On Sun, Aug 22, 2004 at 09:39:07AM +0800, ?????? wrote:
>> PANIC: invalid xlog record length 236052
> Huh, so what kind of operations did you execute within the transaction?
I found one possible explanation, though I don't know if it's the
submitter's problem or not. Create a SQL file that generates a whole
lot of subtransactions, like more than 16000. I used
begin;
create table foo(d1 int);
drop table foo;
savepoint x;
release x;
-- repeat above 2 lines 20000 times
commit;
First try gave me
WARNING: out of shared memory
ERROR: out of shared memory
HINT: You may need to increase max_locks_per_transaction.
WARNING: StartAbortedSubTransaction while in START state
ERROR: current transaction is aborted, commands ignored until end of transaction block
ERROR: current transaction is aborted, commands ignored until end of transaction block
... etc ...
which is fine except for the StartAbortedSubTransaction warning; that
may indicate a problem. (What do you think about it, Alvaro?)
I bumped up max_locks_per_transaction to 1000 and tried again, and got
psql:zzbig.sql:40004: PANIC: invalid xlog record length 80024
server closed the connection unexpectedly
What is happening of course is that more than 16K subtransaction IDs
won't fit in a commit record (since XLOG records have a 16-bit length
field). We're gonna have to rethink the representation of subxact
commit in XLOG.
regards, tom lane
