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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Identifying Extent Management Issues

If the “row cache lock” event is a significant contributor to the non-idle wait time in v$system_event, then there is contention in the data dictionary cache. Extent allocation and de-allocation operations could cause this. v$rowcache provides data dictionary cache information for dc_used_extents  and dc_free_extents. This is particularly true when the values for dlm_conflicts for those parameters increase significantly over time. This means that excessive extent management activity is occurring.

Minimizing Extent Management Operations

Proper storage parameter configuration for tables, indexes, temporary segments, and rollback segments decreases extent allocation and de-allocation frequency. Do this using the initial, next, pctincrease, minextents, and optimal parameters.

Using Locally Managed Tablespaces

Extent allocation and de-allocation overhead can be greatly reduced if locally managed tablespaces are used. For optimal performance and the most efficient use of space, segments in locally managed tablespaces should ideally have similar space allocation characteristics. This enables the tablespace to be created with the proper uniform extent size that corresponds to the ideal extent size increment calculated for the segments.


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Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.


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We require a 12 month service commitment and include the following services:

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  • Four hours of free remote DBA support every month. You can use these free hours for any DBA activity, including database analysis, system design, production migrations or personal mentoring.

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