Tuesday, June 14, 2011

Extensive "Fast Full Index Scan" Access Wait

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Index is extensively accessed via fast full index scans.
Extensive "Fast Full Index Scan" Access findings

Description
What to do next
Perform the following:
n   Examine associated statements in the Statements tab.
n   Focus on the Fast Full Index Scan access type in the Access Types table.
n   Examine column usage for each statement in the Columns table.
Advice
Perform one of the following options:
n   Fast Full index scan can be eliminated by:
Identifying common high selectivity columns for the top statements. Create an index matching the statements predicates.
Partitioning the table according to the best predicates existing in the statements.
n   Fast Full Index scan can be improved by:
Moving the index to another space with a higher block size.
Increasing the DB_FILE_MULTIBLOCK_READ_COUNT init.ora parameter.



  
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