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Ask about Chained and Migrated Rows in oracle 9i

edited Jun 11, 2012 11:03PM in Database Administration (MOSC) 4 commentsAnswered
Hi all,

   Read about Migrated/Chained Rows in oracle, from the DBA_TABLES I can saw the CHAIN_CNT. From Don Berleson, it said them may effect to performance. To void Chaned and Migrated Rows, I can recreate table but I think that this solution is unpopular ! Another solution is use ALTER TABLE MOVE (or REBUILD INDEX) with increase parameters PCTFREE, PCTUSED ?

  After use ALTER TABLE MOVE and rebuild indexes again, select from DBA_TABLES, value of CHAIN_CNT is 0.

  I want ask there are other solutions to void chained and migrated rows ? And should we setup scheduler to find which tables with chained and migrated rows and ALTER them to improve performance ? I do not experience about it, so plz explain to me ?

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