Gets the buffer and logical reads
Hello!The event buffer count gets include the logical reads?
Mertic buffer is the event of the cancellation stamp reading?
Thank you and best regards,
Pavel
Published by: Pavel on June 27, 2012 03:08
Published by: Pavel on June 27, 2012 03:35
Published by: Pavel on June 27, 2012 04:13
Hello
Gets the buffer = number of times that a block was requested to buffer cache. A buffer always get request in a logical reading. Depending on whether or not a copy of the block is available in the buffer cache, a logical read may or may not involve a physical read. So 'buffer gets' and "logical reads" are essentially synonymous and are often used interchangeably.
Oracle is not a special "buffer of cancellation. Undo blocks are stored in rollback segments in UNDO tablespace and are managed in the same way data blocks are (they are even protected by redo). If get consistent requires the reading of UNDO tablespace, then the counters statistics will show that there is a more consistent get in your autotrace.
For more information and examples, see a thread on askTom:
http://asktom.Oracle.com/pls/Apex/f?p=100:11:0:P11_QUESTION_ID:549546900346542976
Best regards
Nikolai
Tags: Database
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