Impossible to make the link between the consistent readings with the number of physical block reads

Hello

The issue is that we have seen consistent readings are more than the total buffers necessary to give back the results.
I emptied the buffer_cache before you execute the query and also questioned the V$ BH to know the details of the buffer for these objects... After the flush before you trigger the request that we do not have buffers about these tables. Which is expected.
We are doing sequential reads of DB file with the plan and will result in a single block, read at a time.
Please take a close look at "TABLE ACCESS BY INDEX ROWID CMPGN_DIM (cr = pr 45379 = 22949 pw = time 0 = 52434931 US)" line in the plan source line below...
Here we have only 22949 data buffers 22949 means reading physical but we are witnessing gets 45379 coherent.

Note: We have the CMPGN_DIM and AD_GRP tables in the tablespace size 4 M block and we have only the default db_cache_size. My database block size is 8192.

Can you please help me understand how the 22949 sequential reads the result in 45379 coherent takes.

Even the V$ BH query buffer details matches with physical reads.


line source of 10043 trace query plan:

SORT ORDER BY 27 (cr = 92355 pr 47396 pw = time = 0 = 359030364 en)
27 WINDOW SORT (cr = 92355 pr 47396 pw = time = 0 = 359030088 en)
NESTED LOOPS EXTRA-ATMOSPHERIQUE 27 (cr = 92355 pr 47396 pw = time = 0 = 359094569 en)
NESTED LOOPS EXTRA-ATMOSPHERIQUE 27 (cr = 92276 pr 47395 pw = time = 0 = 359041825 en)
VIEW 27 (cr = 92197 pr 47393 pw = time = 0 = 358984314 en)
UNION-ALL 27 (cr = 92197 pr 47393 pw = time = 0 = 358984120 en)
HASH GROUP BY 26 (cr = 92197 pr 47393 pw = time = 0 = 358983665 en)
VIEW 9400 (cr = 92197 pr 47393 pw = time = 0 = 359094286 en)
9400 COUNT (cr = 92197 pr 47393 pw = time = 0 = 359056676 en)
VIEW 9400 (cr = 92197 pr 47393 pw = time = 0 = 359009672 en)
9400 SORT ORDER BY (cr = 92197 pr 47393 pw = time = 0 = 358972063 en)
9400 HASH JOIN EXTERNAL (cr = 92197 pr 47393 pw = time = 0 = 358954170 en)
VIEW 9400 (cr = 92191 pr 47387 pw = time = 0 = 349796124 en)
JOIN by HASH 9400 (cr = 92191 pr 47387 pw = time = 0 = 349758517 en)
94 the TABLE ACCESS BY INDEX ROWID CMPGN_DIM (cr = pr 45379 = 22949 pw = time 0 = 52434931 US)
50700 IDX_CMPGN_DIM_UK1 INDEX RANGE SCAN (cr = 351 pr = 349 pw = time 0 = 1915239 US)(object id 55617)
TABLE ACCESS BY INDEX ROWID AD_GRP 60335 (cr = 46812 pr 24438 pw = time = 0 = 208234661 en)
60335 INDEX RANGE SCAN IDX_AD_GRP2 (cr = 613 pr = 611 pw = time 0 = 13350221 US)(object id 10072801)
VIEW 7 (cr = 6 pr = 6 pw = time 0 = 72933 en)
7 HASH GROUP BY (cr = 6 pr = pw 6 = 0, time = 72898 US)
162 PARTITION SINGLE PARTITION RANGE: 4 4 (cr = 6 pr = 6 pw = time 0 = 45363 en)
162 PARTITION PARTITION UNIQUE HASH: 676 676 (cr = 6 pr = pw 6 = 0, time = 44690 US)
162 INDEX RANGE SCAN PK_AD_GRP_DTL_FACT PARTITION: 3748 3748 (cr = 6 pr = pw 6 = 0, time = 44031 US) (object id 8347241)
1 DOUBLE QUICK (cr = 0 pr = 0 pw = time 0 = US 9)
25 TABLE ACCESS BY INDEX ROWID AD_GRP (cr = 79 pr = 2 pw = time 0 = 29817 US)

user622572 wrote:
Hi Charles,
In this test of problem we have not any activity on my tables other than my session. If we do not have all cancel must be applied to the brand CR.

* "So, which means the above?" *-->, that means the number of times where the blocks was visited is counted as CR not the number of buffers required to respond to a request. "

* "" Why a plan of execution would change the number of makes more sense? "*--> changes in the method of access to the path and join required a different number of times the same buffer necessary visit." It means NL require more number of same buffer visits to T2, T1 and INT_T1_C2 as the hash join.

* "' Why not flush the buffer cache would result in the PR drop statistics to 0, but does not change the statistics CR?" *--> each result buffer in physics RAS reads for objects from there which is why it cannot be zero in the first 4 tests where as test5 require PI (we don't rinse prior to that in your test case). " CR cannot be changed with buffer flush. Required CR same amount of pads and tampons visits regardless of buffer flush.

It seems that we can say that "CR numbers include the number of times the block was visited in a query instead of just the number of buffers required". ""

user622572,

You deserve a lot of credit for having read and understood what I posted to correctly answer the questions I asked at the bottom of results and for your ability to answer your original question.

Charles Hooper
IT Manager/Oracle DBA
K & M-making Machine, Inc.

Tags: Database

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