Small nit: please observe postgres community conventions regarding
a) indentation (BSD style, tabsize 4) and
b) diff type (context, not unidiff)
The patch itself looks ok to me.
cheers
andrew
daveg wrote:
>Apologies if this is old news, but pg_autovacuum in 8.0.x has the bad habit
>of SEGVing and exiting when a table gets dropped out from under it. This
>creates problems if you rely on pg_autovacuum for the bulk of your vacuuming
>as it forgets it's statistics when it is restarted and so will skip some
>desireable vacuums.
>
>I looked at the new autovacuum in 8.1 and it appears from casual inspection
>not to have the same problem.
>
>Below is a patch for this that should apply against any 8.0.x. The change
>verifies that the catalog query returned some rows before accessing the row
>data.
>
>-dg
>
>diff -Naur source/postgresql-8.0.2/contrib/pg_autovacuum/pg_autovacuum.c
build/postgresql-8.0.2/contrib/pg_autovacuum/pg_autovacuum.c
>--- source/postgresql-8.0.2/contrib/pg_autovacuum/pg_autovacuum.c 2005-04-02 16:02:03.000000000 -0800
>+++ build/postgresql-8.0.2/contrib/pg_autovacuum/pg_autovacuum.c 2005-09-28 22:15:25.428710172 -0700
>@@ -1013,6 +1013,7 @@
> static void
> perform_maintenance_command(db_info * dbi, tbl_info * tbl, int operation)
> {
>+ PGresult *res;
> char buf[256];
>
> /*
>@@ -1069,10 +1070,16 @@
> fflush(LOGOUTPUT);
> }
>
>- send_query(buf, dbi);
>-
>- update_table_thresholds(dbi, tbl, operation);
>-
>+ res = send_query(buf, dbi);
>+ if (PQntuples(res)) {
>+ update_table_thresholds(dbi, tbl, operation);
>+ } else {
>+ if (args->debug >= 1) {
>+ sprintf(logbuffer, "Cannot refind table %s", tbl->table_name);
>+ log_entry(logbuffer, LVL_DEBUG);
>+ fflush(LOGOUTPUT);
>+ }
>+ }
> if (args->debug >= 2)
> print_table_info(tbl);
> }
>
>
