Cyril VELTER wrote:
De : mailto:dev@xxxxxxxxxxxx
Cyril VELTER wrote:
Is length() supposed to return the very high length in case of corruption
?
You'd have thought it would. The odd thing (if it is data corruption) is
that you would expect to see something in the server logs about a
failure to allocate 12345412234124 bytes of memory or some such. Whereas
all you get is this winsock error.
I have another theory. The message printed by pg_dump :
"pg_dump: Error message from server: out of memory"
is printed in dumpTableData_copy (pg_dump.c) : write_msg(NULL, "Error message
from server: %s", PQerrorMessage(g_conn));
There are serveral places in libpq where the conn error might be set to "out
of memory". I've also discovered that the machine running pg_dump is pretty
tight in ram (256M) and that no swap file is active (oversight after a disk
upgrade). May be this error is simply pg_dump running out of memory and not the
server. This would also explain that the server only report a socket error
(though I would have expected WSAECONNRESET (10054) instead of WSAECONNREFUSED
(10061)).
Aha - that sounds likely. If you're dumping multi-megabyte rows I can
see how you'd get into problems on a client with a small amount of RAM.
The 8.0.13 pg_dump used to work just fine on the exact same machine. Maybe 8.2
pg_dump need more memory (or maybe a memory leak ?).
Might just be slightly higher RAM usage in your particular case. It
could be there were some trade-offs between size and speed.
I'm running the dump again after adding some swap space and will monitor
memory usage.
What do you think ?
I think you've found the problem. If you're short of RAM though you
might also have difficulty restoring the dump.
You could run pg_dump on the Windows server and copy its output to the
RAM-limited Linux box. You could even run pg_restore from the Windows
box - if you don't have a direct channel to the database you can use the
putty ssh-client to create a tunnelled connection to the Linux box.
--
Richard Huxton
Archonet Ltd
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