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Don Burleson Blog 







 db_file_noncontig_mblock_read_count  Tips

Oracle Database Tips by Donald BurlesonMarch 11, 2015

Question:  How do I use the db_file_noncontig_mblock_read_count parameter?  Will db_file_noncontig_mblock_read_count  increase the number of multi-block reads on index range scans?

Answer:  The db_file_noncontig_mblock_read_count maximum number of blocks to be prefetched in one batch I/O.   for non-contiguous (non-adjacent  blocks, db_file_noncontig_mblock_read_count number of noncontiguous db blocks to be prefetched.   If set to 1, prefetching will be disabled.

This query will describe the db_file_noncontig_mblock_read_count parameter:

   nam.ksppinm  name,

   nam.ksppdesc description
   x$ksppi nam,

   x$ksppsv val
   nam.indx = val.indx

order by 1;

Also see my related notes on _index_prefetch_factor.



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