RE: Row Migration/Rowchaining
- From: maheswara.rao@xxxxxxx
- To: <dannorris@xxxxxxxxxxxxx>, <TESTAJ3@xxxxxxxxxxxxxx>
- Date: Fri, 11 Apr 2008 15:33:49 -0400
Thank you Dan and Joe.
I checked dba_tables. The query result shows 101 rows.
From v$sysstat, I am getting 2,327,441.
Does v$sysstat contains other info when query for 'table fetch continued row'?
Please see below queries.
1 SELECT owner, table_name, chain_cnt
2 FROM dba_tables
3* WHERE chain_cnt > 0
SQL> /
OWNER TABLE_NAME CHAIN_CNT
------------------------------ ------------------------------ ----------
REPORTER REP_AUDIT_SEVERITY 18
REPORTER REP_AUDIT_ACK 83
= = = =
SQL> SELECT name, value
FROM v$sysstat
WHERE name = 'table fetch continued row';
NAME VALUE
---------------------------------- --------
table fetch continued row 2327441
________________________________________
From: Dan Norris [mailto:dannorris@xxxxxxxxxxxxx]
Sent: Friday, April 11, 2008 3:23 PM
To: TESTAJ3@xxxxxxxxxxxxxx
Cc: Rao, Maheswara; oracle-l@xxxxxxxxxxxxx
Subject: Re: Row Migration/Rowchaining
For the purposes of statistics, chained and migrated rows are the same. So,
chain_cnt would show a count of all chained rows which includes all migrated
rows.
You could also do:
analyze table <tablename> list chained rows;
which would put the rows into the table INVALID_ROWS which is created by the
OH/rdbms/admin/utlvalid.sql script (you'd have to run that script to create the
table first).
I believe that you can do the analyze on any table and statistics will not be
computed, but just the chained rows will be listed into the INVALID_ROWS table.
Of course, a FTS will be required to find the chained rows, so beware of the
I/O impact of running such a command.
Dan
TESTAJ3@xxxxxxxxxxxxxx wrote:
This will show you the table for chained rows, not sure if it covers migrated
or not, anyone else?
select owner, table_name, chain_cnt from dba_tables where chain_cnt > 0;
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