Re: Postgresql Database Lock Problem

The statement that creates lock and waiting is in following. This is from pg_stats and pg_stat_activity view.
Here AD_Sequence is a table that maintains sequence number for all database objects. It automatically generates primary
keyvalue for all table insert. I think it also generates transaction related ID. For that reason it needs to update
nextsequence value for transaction ID. 

Statment:
======================
SELECT CurrentNext, CurrentNextSys, IncrementNo, Prefix, Suffix, DecimalPattern, AD_Sequence_ID FROM AD_Sequence WHERE
Name= $1 AND AD_Client_ID = $2 AND IsActive='Y' AND IsTableID='N' AND IsAutoSequence='Y' ORDER BY AD_Client_ID DESC FOR
UPDATEOF AD_Sequence 



AD_Sequence Table Definition
=====================

adempiere=# \d ad_sequence
                        Table "adempiere.ad_sequence"
     Column     |            Type             |          Modifiers
----------------+-----------------------------+------------------------------
 ad_sequence_id | numeric(10,0)               | not null
 ad_client_id   | numeric(10,0)               | not null
 ad_org_id      | numeric(10,0)               | not null
 isactive       | character(1)                | default 'Y'::bpchar
 created        | timestamp without time zone | not null default now()
 createdby      | numeric(10,0)               | not null
 updated        | timestamp without time zone | not null default now()
 updatedby      | numeric(10,0)               | not null
 name           | character varying(60)       | not null
 description    | character varying(255)      |
 vformat        | character varying(40)       |
 isautosequence | character(1)                | not null default 'Y'::bpchar
 incrementno    | numeric(10,0)               | not null
 startno        | numeric(10,0)               | not null
 currentnext    | numeric(10,0)               | not null
 currentnextsys | numeric(10,0)               | not null
 isaudited      | character(1)                | default 'N'::bpchar
 istableid      | character(1)                | default 'N'::bpchar
 prefix         | character varying(255)      |
 suffix         | character varying(255)      |
 startnewyear   | character(1)                | default 'N'::bpchar
 datecolumn     | character varying(60)       |
 decimalpattern | character varying(40)       |
Indexes:
    "ad_sequence_pkey" PRIMARY KEY, btree (ad_sequence_id)
    "ad_sequence_name" UNIQUE, btree (ad_client_id, name)
Check constraints:
    "ad_sequence_isactive_check" CHECK (isactive = ANY (ARRAY['Y'::bpchar, 'N'::bpchar]))
    "ad_sequence_isaudited_check" CHECK (isaudited = ANY (ARRAY['Y'::bpchar, 'N'::bpchar]))
    "ad_sequence_isautosequence_check" CHECK (isautosequence = ANY (ARRAY['Y'::bpchar, 'N'::bpchar]))
    "ad_sequence_istableid_check" CHECK (istableid = ANY (ARRAY['Y'::bpchar, 'N'::bpchar]))
    "ad_sequence_startnewyear_check" CHECK (startnewyear = ANY (ARRAY['Y'::bpchar, 'N'::bpchar]))
Foreign-key constraints:
    "sequenceclient" FOREIGN KEY (ad_client_id) REFERENCES ad_client(ad_client_id) DEFERRABLE INITIALLY DEFERRED
    "sequenceorg" FOREIGN KEY (ad_org_id) REFERENCES ad_org(ad_org_id) DEFERRABLE INITIALLY DEFERRED





With Thanks & Regards:
---------------------
Shohorab Hossain



----- Original Message ----
From: Scott Marlowe <scott.marlowe@gmail.com>
To: shohorab hossain <shohorab23@yahoo.com>
Cc: pgsql-admin@postgresql.org; pgsql-docs@postgresql.org; pgsql-general@postgresql.org
Sent: Wednesday, November 18, 2009 2:55:25
Subject: Re: [GENERAL] Postgresql Database Lock Problem

Next time this is happening join the pg_lock table to the
pg_stat_activity table to see which query is holding the lock for a
bazillion milliseconds, while it's happening.  That query / statement
may give you some clue what's wrong.



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