Thread: Index counters of statistics collector does not work on 7.4devel

Fields idx_scan and idx_tup_fetch are not changed by an index scan.
   =# create table class1 (id integer);   CREATE TABLE   =#    -- Insert 0..9999 into class1   =# create index
class1_id_indexon class1 (id);   CREATE INDEX   =# vacuum analyze;   VACUUM   =# \x   Expanded display is on.   =#
select* from pg_stat_all_tables where relname = 'class1';   -[ RECORD 1 ]-+-------   relid         | 17166   schemaname
  | public   relname       | class1   seq_scan      | 2   seq_tup_read  | 13000   idx_scan      | 0   idx_tup_fetch | 0
 n_tup_ins     | 10000   n_tup_upd     | 0   n_tup_del     | 0
 
   =# \x   Expanded display is off.   =# explain select * from class1 where id = 1234;                  QUERY PLAN
                              ------------------------------------------------------------------------------    Index
Scanusing class1_id_index on class1  (cost=0.00..3.01 rows=2 width=4)      Index Cond: (id = 1234)   (2 rows)
 
   =# \x   Expanded display is on.   =# select * from pg_stat_all_tables where relname = 'class1';   -[ RECORD 1
]-+-------  relid         | 17166   schemaname    | public   relname       | class1   seq_scan      | 2   seq_tup_read
|13000   idx_scan      | 0   idx_tup_fetch | 0   n_tup_ins     | 10000   n_tup_upd     | 0   n_tup_del     | 0
 
   =# 


Kenji Sugita                                      

"Kenji Sugita" <sugita@srapc1327.sra.co.jp> wrote:
>     =# explain select * from class1 where id = 1234;
>       QUERY PLAN
>     ----------------------------------------------------------------------
--------
>      Index Scan using class1_id_index on class1  (cost=0.00..3.01 rows=2
width=4)
>        Index Cond: (id = 1234)
>     (2 rows)

I don't think that the select is really performed, try the same experiment
but doing
explain analyze instead.


Regards
Gaetano Mendola

From: "Mendola Gaetano" <mendola@bigfoot.com>
Subject: Re: [HACKERS] Index counters of statistics collector does not work on 7.4devel
Date: Sun, 20 Jul 2003 15:42:29 +0200

;;; "Kenji Sugita" <sugita@srapc1327.sra.co.jp> wrote:
;;; >     =# explain select * from class1 where id = 1234;
;;; >       QUERY PLAN
;;; >     ----------------------------------------------------------------------
;;; --------
;;; >      Index Scan using class1_id_index on class1  (cost=0.00..3.01 rows=2
;;; width=4)
;;; >        Index Cond: (id = 1234)
;;; >     (2 rows)
;;; 
;;; I don't think that the select is really performed, try the same experiment
;;; but doing
;;; explain analyze instead.

I forgot to include a select without explain.  I found it July 15. Anyway it
works for today's version.


Kenji Sugita