Re: Vacuum statistics - Mailing list pgsql-hackers

On Thu, Sep 5, 2024 at 1:23 AM Alena Rybakina <a.rybakina@postgrespro.ru> wrote:
>
> Hi, all!
>
> I have attached the new version of the code and the diff files
> (minor-vacuum.no-cbot).
>

hi.

still have white space issue when using "git apply",
you may need to use "git diff --check" to find out where.


 /* ----------
diff --git a/src/test/regress/expected/opr_sanity.out
b/src/test/regress/expected/opr_sanity.out
index 5d72b970b03..7026de157e4 100644
--- a/src/test/regress/expected/opr_sanity.out
+++ b/src/test/regress/expected/opr_sanity.out
@@ -32,11 +32,12 @@ WHERE p1.prolang = 0 OR p1.prorettype = 0 OR
        prokind NOT IN ('f', 'a', 'w', 'p') OR
        provolatile NOT IN ('i', 's', 'v') OR
        proparallel NOT IN ('s', 'r', 'u');
- oid  |        proname
-------+------------------------
+ oid  |         proname
+------+-------------------------
  8001 | pg_stat_vacuum_tables
  8002 | pg_stat_vacuum_indexes
-(2 rows)
+ 8003 | pg_stat_vacuum_database
+(3 rows)


looking at src/test/regress/sql/opr_sanity.sql:

-- **************** pg_proc ****************
-- Look for illegal values in pg_proc fields.

SELECT p1.oid, p1.proname
FROM pg_proc as p1
WHERE p1.prolang = 0 OR p1.prorettype = 0 OR
       p1.pronargs < 0 OR
       p1.pronargdefaults < 0 OR
       p1.pronargdefaults > p1.pronargs OR
       array_lower(p1.proargtypes, 1) != 0 OR
       array_upper(p1.proargtypes, 1) != p1.pronargs-1 OR
       0::oid = ANY (p1.proargtypes) OR
       procost <= 0 OR
       CASE WHEN proretset THEN prorows <= 0 ELSE prorows != 0 END OR
       prokind NOT IN ('f', 'a', 'w', 'p') OR
       provolatile NOT IN ('i', 's', 'v') OR
       proparallel NOT IN ('s', 'r', 'u');

that means
 oid  |         proname
------+-------------------------
 8001 | pg_stat_vacuum_tables
 8002 | pg_stat_vacuum_indexes
 8003 | pg_stat_vacuum_database


These above functions, pg_proc.prorows should > 0 when
pg_proc.proretset is true.
I think that's the opr_sanity test's intention.
so you may need to change pg_proc.dat.

BTW the doc says:
prorows float4, Estimated number of result rows (zero if not proretset)



segmentation fault cases:
select * from pg_stat_vacuum_indexes(0);
select * from pg_stat_vacuum_tables(0);


+ else if (type == PGSTAT_EXTVAC_DB)
+ {
+ PgStatShared_Database   *dbentry;
+ PgStat_EntryRef   *entry_ref;
+ Oid dbid = PG_GETARG_OID(0);
+
+ if (OidIsValid(dbid))
+ {
+ entry_ref = pgstat_get_entry_ref_locked(PGSTAT_KIND_DATABASE,
+ dbid, InvalidOid, false);
+ dbentry = (PgStatShared_Database *) entry_ref->shared_stats;
+
+ if (dbentry == NULL)
+ /* Table doesn't exist or isn't a heap relation */
+ return;
+
+ tuplestore_put_for_database(dbid, rsinfo, dbentry);
+ pgstat_unlock_entry(entry_ref);
+ }
+ }
didn't error out when dbid is invalid?



pg_stat_vacuum_tables
pg_stat_vacuum_indexes
pg_stat_vacuum_database
these functions didn't verify the only input argument oid's kind.
for example:

create table s(a int primary key) with (autovacuum_enabled = off);
create view sv as select * from s;
vacuum s;
select * from pg_stat_vacuum_tables('sv'::regclass::oid);
select * from pg_stat_vacuum_indexes('sv'::regclass::oid);
select * from pg_stat_vacuum_database('sv'::regclass::oid);

above all these 3 examples should error out? because  sv is view.

in src/backend/catalog/system_views.sql
for view creation of pg_stat_vacuum_indexes
you can change to

WHERE
  db.datname = current_database() AND
  rel.oid = stats.relid AND
  ns.oid = rel.relnamespace
AND rel.relkind = 'i':



pg_stat_vacuum_tables  in in src/backend/catalog/system_views.sql
you can change to

WHERE
  db.datname = current_database() AND
  rel.oid = stats.relid AND
  ns.oid = rel.relnamespace
AND rel.relkind = 'r':