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RE: "snapshot too old" and undo_retention

From: Khemmanivanh, Somckit <>
Date: Wed, 5 Oct 2005 15:13:11 -0700
Message-ID: <65C0D8935651CB4D96E97CEFAC5A12B99634DF@wafedixm10.corp.weyer.pri>


It's not in DBSTATC.  

It's in the init<SID>.sap file (the stats_sample_size parameter).  

For example, stats_sample_size = P10, means sample using 10%  

There are a whole bunch more params in this file...  

[] On Behalf Of Roger Xu
Sent: Wednesday, October 05, 2005 1:52 PM To: Hand, Michael T
Cc: Oracle-L_at_Freelists. Org (E-mail)
Subject: RE: "snapshot too old" and undo_retention

We are on SAP 4.6C. Which field in table DBSTATC is for sample size?

SQL> select * from sapr3.DBSTATC where DBOBJ = 'BSIS';

DBOBJ                DO OBJOW                DBTYP      VW A OBJEC
-------------------- -- -------------------- ---------- -- - ----------
---------- ---- ----- - - -------- ------ -
BSIS                 01 SAPR3                ORACLE     A  A D_FA
         2 C            X          000000

SQL> desc sapr3.DBSTATC
 Name                                      Null?    Type
 ----------------------------------------- --------
 DBOBJ                                     NOT NULL VARCHAR2(20)
 DOTYP                                     NOT NULL VARCHAR2(2)
 OBJOW                                     NOT NULL VARCHAR2(20)
 DBTYP                                     NOT NULL VARCHAR2(10)
 VWTYP                                     NOT NULL VARCHAR2(2)
 ACTIV                                     NOT NULL VARCHAR2(1)
 OBJEC                                     NOT NULL VARCHAR2(10)
 AEDAT                                     NOT NULL VARCHAR2(8)
 SIGNI                                     NOT NULL NUMBER(3)
 AMETH                                     NOT NULL VARCHAR2(4)
 OPTIO                                     NOT NULL VARCHAR2(5)
 TOBDO                                     NOT NULL VARCHAR2(1)
 HISTO                                     NOT NULL VARCHAR2(1)
 TDDAT                                     NOT NULL VARCHAR2(8)
 DURAT                                     NOT NULL VARCHAR2(6)
 PLAND                                     NOT NULL VARCHAR2(1)



-----Original Message-----
From: Hand, Michael T [] Sent: Tuesday, October 04, 2005 10:54 AM To: Roger Xu
Cc: Oracle-L_at_Freelists. Org (E-mail)
Subject: RE: "snapshot too old" and undo_retention

Roger, Tru64 5.1 SAP R/3 4.7
Our BSIS table is only about 1/4 the size of yours. When we run Brconnect the sample size is 3% (from the DBSTATC table) and no histograms are collected. Also, the table is stable/slow growing enough so that stats haven't been refreshed in more than 6 months (and that was due to a DMT to LMT conversion).

I realize each SAP install has its own unique conditions, but your statistics gathering method on this table seems extreme. Some suggestions before considering partitions: 1) look into archiving as Jared mentioned, 2) change Brconnect parameters to use dbms_stats instead of analyze, 3) reduce the frequency that stats are collected (the default is 50% change in # of rows), 5) validate need for histograms & 100% sample size (change DBSTATC), lastly, if 5) can not be reduced, look into collecting stats on another box and import them.


-----Original Message-----
[] On Behalf Of Roger Xu
Sent: Friday, September 30, 2005 5:35 PM To: Robyn
Cc: Oracle-L_at_Freelists. Org (E-mail)
Subject: RE: "snapshot too old" and undo_retention

First of thanks to everyone who replied my email. We use SAP tools (brconnect) to collect statistics and it comes out "ANALYZE TABLE ..COMPUTE STATISTICS FOR TABLE FOR ALL INDEXED COLUMNS SIZE 1 FOR ALL INDEXES".
We do not have a data warehouse and the table BSIS has 273 million rows. We are on and this table is not partitioned and the table itself is 80 gig in size.
Anybody partition this table? How? Thanks.

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Received on Wed Oct 05 2005 - 17:16:34 CDT

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