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тАО12-09-2003 02:06 AM
тАО12-09-2003 02:06 AM
set autotrace on question
I am trying to find more about the execution plan of a SQL. My question is what does consistent gets mean. Any resource I can go for help?
I am getting the following
87264565 consistent gets
34534 phy read
Thanks
Sushil Singh
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тАО12-09-2003 03:28 AM
тАО12-09-2003 03:28 AM
Re: set autotrace on question
check Metalink note 293440.995 some related question.
Rgds,
Jean-Luc
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тАО12-09-2003 05:26 AM
тАО12-09-2003 05:26 AM
Re: set autotrace on question
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тАО12-09-2003 11:56 AM
тАО12-09-2003 11:56 AM
Re: set autotrace on question
consistent gets are logical reads. That is, they are reads from data that's already cached in the buffer cache.
session logical reads is the sum of all the consistent mode gets (consistent reads) and current mode gets (db block gets).
Then there are physical reads and physical reads direct. Physical reads occur when a request for data is not serviced by the Oracle buffer cache. The data could come from filesystem buffers, a disk array's memory cache, or even a track/sector buffer on the hard drive itself.) Physical reads direct are reads that bypass the buffer cache entirely. This can happen w/ Parallel Query operations, for example. Note that physical reads includes all physical reads including the direct ones.
IA
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тАО12-09-2003 02:42 PM
тАО12-09-2003 02:42 PM
Re: set autotrace on question
Oracle recommends that this ratio be at least 80%, but, I like at least 90% myself.