Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations Chriss Miller on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
-
db file scattered read
Thanks dbtoo2001, I have checked that the db_file_multiblock_read_count and it is set to its maximum value. For further info, I set up parallel queries with up to 32 concurrent slaves, this had no positive impact whatsoever. In fact, the system stats fairly welll replicate what happens without...- oddbod1
- Post #6
- Forum: Oracle: All versions
-
db file scattered read
Thanks Guys, we have played with the db_file_multiblock_read_count, altering this does not improve performance. The OS limit is 64K, the db_BLOCK_SIZE is 8k so setting the db_file_multiblock_read_count to 8 is the optimal setting. Any value above this causes a degfradation in performance...- oddbod1
- Post #4
- Forum: Oracle: All versions
-
db file scattered read
I have a problem. Statspack shows our highest wait event is db file scattered reads against a reporting instance, queries often perform full table scans but they have been optimised. I submit one query and then the same query 10 seconds later. The first query completes in 3 minutes, the...- oddbod1
- Thread
- Replies: 5
- Forum: Oracle: All versions
