Re: Row Migration/Rowchaining

  • From: Dan Norris <dannorris@xxxxxxxxxxxxx>
  • To: TESTAJ3@xxxxxxxxxxxxxx
  • Date: Fri, 11 Apr 2008 14:23:25 -0500

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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