When ASM reads my block, it will usually read much more than just the block I requested.
When ASM reads my (8K) block, it will usually read much more than just the block I requested.
4 questions :
1) Am I right when I presume ASM will increase my request to 1 complete AU sized retrieval action done on the I/O subsystem?
2) Now what interests me is where does the rest of that I/O size sleep / reside ?
3) Under what circumstances will those poor, initially unused and discarded KB's be revived and be reckognized for their true value. Will only certain actions, like a scan, cause the 'overhead' to be used ?
kind regards, Niek
Hi Aman,
ASM does not do IOs .
ASM only gives extent map to clients and clients take that pointers and do direct IO on that block.
This is very much true statement and explains what will happen if data block is not available at buffer .
That's why most of IO errors are getting printed on rdbms alertlog file ,rather ASM .Which inturn confirms my statement...
ASM level DBWR ,LGWR are related to ASM level data processing .
Keeping above things in mind ,it clarifies ASM does not hold any IOs /place on sleep.
ASM at diskgroup level,always does IOs as per au_size of that diskgroup .
Regards,
Aritra
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Dynamic Calc processor cannot lock more than [100] ESM blocks during the calculation, please increase CalcLockBlock setting and then retry(a small data cache setting could also cause this problem, please check the data cache size setting).
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Possible Solutions
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Regards,
NaveenYour calculation needs to hold more blocks in memory than your current set up allows.
From the docs (quoting so I don't have to write it, not to be a smarta***:
CALCLOCKBLOCK specifies the number of blocks that can be fixed at each level of the SET LOCKBLOCK HIGH | DEFAULT | LOW calculation script command.
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-------Statistics of AWRGPLAN:Plan1 -------
Dimension Name Type Declared Size Actual Size
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HSP_Rates SPARSE 11 11
Account DENSE 602 420
Period DENSE 19 19
Year SPARSE 31 31
Scenario SPARSE 6 6
Version SPARSE 4 4
Currency SPARSE 10 10
Entity SPARSE 28 18
Departments SPARSE 165 119
ICP SPARSE 80 74
LoB SPARSE 396 344
Locations SPARSE 57 35
View SPARSE 5 5
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Actual Block Size : 7980
Declared Maximum Blocks : 3.41379650304E+015
Actual Maximum Blocks : 1.87262635317E+015
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Average Sparse Density : 6.936782E-010
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Database Type : NORMAL
Status : Loaded
Elapsed Db Time : 00:00:05:00
Users Connected : 2
Blocks Locked : 0
Dimensions : 13
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Data File Cache Size Setting : 0
Current Data File Cache Size : 0
Data Cache Size Setting : 3128160
Current Data Cache Size : 3128160
Index Cache Size Setting : 1048576
Current Index Cache Size : 1048576
Index Page Size Setting : 8192
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Cache Memory Locking : Disabled
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Data Compression on Disk : Yes
Data Compression Type : BitMap Compression
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Retrieval Sort Buffer Size (in K) : 10
Isolation Level : Uncommitted Access
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Time Out : Never
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Number of rows to data load before internal commit : 0
Number of disk volume definitions : 0
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Currency Time Dimension Member : Period
Currency Category Dimension Member : Account
Currency Type Dimension Member :
Currency Partition Member :
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User Name : 6236@Native Directory
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End Time : Tue Aug 16 09:44:12 2011
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