On Sun, Apr 14, 2002 at 10:13:17PM +0200, Karel Zak wrote:
> > (2) Sometimes executing a PREPARE gives this warning:
> >
> > nconway=> prepare q1 as select * from pg_class;
> > WARNING: AllocSetFree: detected write past chunk end in TransactionCommandContext 0x83087ac
> > PREPARE
> >
> > Does anyone know what problem this indicates?
>
> The memory managment is diffrent between 7.0 and 7.2. There is
> needful port cache shared-memory managment. I will look at it.
Hmm, I probably found it be first look to patch file.
The WARNING message is from leak detection. I'm sure that you seethis message if you use SHARE cache type.
- PREPARE_KEY_PREFIX_SIZE is 4 not 3
- in the PrepareKey() is needful fix:
+ if (store == PREPARE_STORE_SHARE) { /* shared between same DB */
+ *flag |= QCF_SHARE_NOTREMOVEABLE;
+ key = (char *) palloc(strlen(name) + PREPARE_KEY_PREFIX_SIZE
+ + strlen(DatabaseName) +1);
^^^^^^^ must be 3
+ sprintf(key, "%s_%s_", DatabaseName, PREPARE_KEY_PREFIX); ^^^^^^
the space for '_' is not allocated :-(
It's my bug probably, I good knew why we need leak detection :-)
Karel
PS. Sorry that I don't send a patch, but now I haven't my computer there.
-- Karel Zak <zakkr@zf.jcu.cz>http://home.zf.jcu.cz/~zakkr/C, PostgreSQL, PHP, WWW, http://docs.linux.cz,
http://mape.jcu.cz
