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Do you suffer from sparse Index blocks?

Oracle Tips by Burleson Consulting
Don Burleson


Most Oracle experts now agree that sparse index data blocks (index blocks with only a few entries) can dramatically slow-down multi-block index read operations such as index range scans and index fast-full scans.  Sparse index nodes result from bulk row delete operations and use can use STATSPACK and AWR to see if an index experiences index range scans or fast full scans.

Here is a great summary of the current wisdom regarding Oracle index rebuilding and a great undocumented function called sys_op_lbid that can quickly let you know about sparse index density:

http://www.dba-oracle.com/t_sys_op_lbid_index_node_density.htm

**************************

On a Personal note, Cowboy boots for ponies?

Some of our blind guide horse users and now having custom-designed pony sneakers, boots and even fancy dress shoes.  Check out the latest footwear for "seeing eye" ponies:

http://dba-oracle.blogspot.com/2005/04/is-this-over-top.html



 

 

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