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1#
发表于 2012-4-20 21:34:24
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LOB performance Guidelines
ContentsExecutive Overview
LOB Overview
Important Storage Parameters
CHUNK
Definition
Points to Note
Recommendation
In-line and Out-of-Line storage: ENABLE STORAGE IN ROW and DISABLE STORAGE IN ROW4
Definition
Points to Note
Recommendation
CACHE, NOCACHE
Definition
Points to Note
Recommendation
Consistent Reads on LOBs: RETENTION and PCTVERSION
Definition
Points to Note
Recommendation
LOGGING, NOLOGGING
Definition
Points to Note
Recommendation
Performance GUIDELINE - LOB Loading
Points to Note
Use array operations for LOB inserts
APPENDIX A
LONG API access to LOB datatype
APPENDIX B
Migration from in-line to out-of-line (and out-of-line to in-line) storage
APPENDIX C
How LOB data is stored
In-line LOB - LOB size less than 3964 bytes
In-line LOB - LOB size = 3965 bytes (1 byte greater than 3964)
In-line LOB - LOB size greater than 12 chunk addresses
lob_performance_guidelines.pdf
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