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I've run across a pretty serious problem with pg_autovacuum. 

pg_autovacuum looses track of any table that's ever been truncated
(possibly other situations too).   When i truncate a table it gets a
new relfilenode in pg_class.  This is a problem because pg_autovacuum
assumes pg_class.relfilenode will join to pg_stats_all_tables.relid.
pg_stats_all_tables.relid is actallly the oid from pg_class, not the
relfilenode.   These two values start out equal so pg_autovacuum works
initially, but it fails later on because of this incorrect assumption.

This patch fixes that problem.  Applied to HEAD and 7.4.X.

Brian Hirt
This commit is contained in:
Bruce Momjian 2003-12-01 23:19:33 +00:00
parent 2712ca771d
commit ea4b9f14f3
2 changed files with 9 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
contrib/pg_autovacuum/pg_autovacuum.c
View File

@ -116,7 +116,7 @@ init_table_info(PGresult *res, int row, db_info * dbi)
atol(PQgetvalue(res, row, PQfnumber(res, "n_tup_upd"))));
new_tbl->curr_vacuum_count = new_tbl->CountAtLastVacuum;
new_tbl->relfilenode = atoi(PQgetvalue(res, row, PQfnumber(res, "relfilenode")));
new_tbl->relid = atoi(PQgetvalue(res, row, PQfnumber(res, "oid")));
new_tbl->reltuples = atoi(PQgetvalue(res, row, PQfnumber(res, "reltuples")));
new_tbl->relpages = atoi(PQgetvalue(res, row, PQfnumber(res, "relpages")));
@ -154,7 +154,7 @@ update_table_thresholds(db_info * dbi, tbl_info * tbl, int vacuum_type)
if (dbi->conn != NULL)
{
snprintf(query, sizeof(query), PAGES_QUERY, tbl->relfilenode);
snprintf(query, sizeof(query), PAGES_QUERY, tbl->relid);
res = send_query(query, dbi);
if (res != NULL)
{
@ -237,7 +237,7 @@ update_table_list(db_info * dbi)
for (i = 0; i < t; i++)
{ /* loop through result set looking for a
* match */
if (tbl->relfilenode == atoi(PQgetvalue(res, i, PQfnumber(res, "relfilenode"))))
if (tbl->relid == atoi(PQgetvalue(res, i, PQfnumber(res, "oid"))))
{
found_match = 1;
break;
@ -267,7 +267,7 @@ update_table_list(db_info * dbi)
while (tbl_elem != NULL)
{
tbl = ((tbl_info *) DLE_VAL(tbl_elem));
if (tbl->relfilenode == atoi(PQgetvalue(res, i, PQfnumber(res, "relfilenode"))))
if (tbl->relid == atoi(PQgetvalue(res, i, PQfnumber(res, "oid"))))
{
found_match = 1;
break;
@ -361,7 +361,7 @@ print_table_info(tbl_info * tbl)
{
sprintf(logbuffer, " table name: %s.%s", tbl->dbi->dbname, tbl->table_name);
log_entry(logbuffer);
sprintf(logbuffer, " relfilenode: %i; relisshared: %i", tbl->relfilenode, tbl->relisshared);
sprintf(logbuffer, " relid: %i; relisshared: %i", tbl->relid, tbl->relisshared);
log_entry(logbuffer);
sprintf(logbuffer, " reltuples: %i; relpages: %i", tbl->reltuples, tbl->relpages);
log_entry(logbuffer);
@ -1072,7 +1072,7 @@ main(int argc, char *argv[])
{ /* Loop through tables in list */
tbl = ((tbl_info *) DLE_VAL(tbl_elem)); /* set tbl_info =
* current_table */
if (tbl->relfilenode == atoi(PQgetvalue(res, j, PQfnumber(res, "relfilenode"))))
if (tbl->relid == atoi(PQgetvalue(res, j, PQfnumber(res, "oid"))))
{
tbl->curr_analyze_count =
(atol(PQgetvalue(res, j, PQfnumber(res, "n_tup_ins"))) +

6
contrib/pg_autovacuum/pg_autovacuum.h
View File

@ -34,10 +34,10 @@
#define VACUUM_ANALYZE 0
#define ANALYZE_ONLY 1
#define TABLE_STATS_QUERY "select a.relfilenode,a.relname,a.relnamespace,a.relpages,a.relisshared,a.reltuples,b.schemaname,b.n_tup_ins,b.n_tup_upd,b.n_tup_del from pg_class a, pg_stat_all_tables b where a.relfilenode=b.relid and a.relkind = 'r'"
#define TABLE_STATS_QUERY "select a.oid,a.relname,a.relnamespace,a.relpages,a.relisshared,a.reltuples,b.schemaname,b.n_tup_ins,b.n_tup_upd,b.n_tup_del from pg_class a, pg_stat_all_tables b where a.oid=b.relid and a.relkind = 'r'"
#define FRONTEND
#define PAGES_QUERY "select relfilenode,reltuples,relpages from pg_class where relfilenode=%i"
#define PAGES_QUERY "select oid,reltuples,relpages from pg_class where oid=%i"
#define FROZENOID_QUERY "select oid,age(datfrozenxid) from pg_database where datname = 'template1'"
#define FROZENOID_QUERY2 "select oid,datname,age(datfrozenxid) from pg_database where datname!='template0'"
@ -84,7 +84,7 @@ struct tableinfo
{
char *schema_name,
*table_name;
int relfilenode,
int relid,
reltuples,
relisshared,
relpages;