Re: Replication Syatem

["Gauri Kanekar" <meetgaurikanekar(at)gmail(dot)com>]

"table1" structure :
 id        integer    not null
 code        integer    not null
 crid        integer    not null
 status        character varying(1)    default 'A'::character varying
 delta1        bigint    default 0
 delta2        bigint    default 0
 delta3        bigint    default 0
 delta4        bigint    default 0
 tz_id        integer    default 0
Indexes:
    "idx1" PRIMARY KEY, btree (id)

    "idx2" UNIQUE, btree (code, crid)
    "idx3" btree (tz_id)
    "idx4" btree (status)

code as crid are foreign key.

update table1 set delta1 = 100 where code/1000000 =999;

On Wed, Apr 30, 2008 at 12:16 PM, Gauri Kanekar <meetgaurikanekar(at)gmail(dot)com> wrote:

fillfactor is set to 80 as you suggested.
delta* fields r updated and these fields are no where related to any of the index fields.

 

On Wed, Apr 30, 2008 at 12:13 PM, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com> wrote:

On Wed, Apr 30, 2008 at 11:09 AM, Gauri Kanekar
<meetgaurikanekar(at)gmail(dot)com> wrote:
>  relid |    relname     | n_tup_ins | n_tup_upd | n_tup_hot_upd | n_dead_tup
> -------+----------------+-----------+-----------+---------------+------------
>  16461 | table1 |         0 |   8352496 |          5389 |    8351242
>

Hmm.. So indeed there are very few HOT updates. What is the fillfactor
you are using for these tests ? If its much less than 100, the very
low percentage of HOT updates would make me guess that you are
updating one of the index columns. Otherwise at least the initial
updates until you fill up the free space should be HOT.

Thanks,
Pavan


--
Pavan Deolasee
EnterpriseDB     http://www.enterprisedb.com

--
Regards
Gauri

-- 
Regards
Gauri