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This blog post is generic in nature and based on my recent experience with a content management system where securefile BLOBs are critical in storing and retrieving the checked in content. It is stro ngly suggested to check the official documentation in addition to these brief guidelines. In general, Oracle Database SecureFiles and Large Objects Developer's Guide 11g Release 2 (11.2) is a good starting point when creating tables involving SecureFiles and LOBs.
Guidelines
DISABLE STORAGE IN ROW
" (out-of-line) if the average LOB size is expected to be > 4 KB. The default inlining is fine for smaller LOBsNOCACHE
) if large number of LOBs are stored and not expected to be retrieved frequentlyCOMPRESS
option if storage capacity is a concern and a constraint. It saves disk space at the expense of some performance overhead. In a RAC database environment, it is recommended to compress the LOBs to reduce the interconnect traffic
DEDUPLICATE
option enables sharing the same data blocks for similar files thus
reducing storage overhead and simplifying storage management
_use_zero_copy_io=FALSE
to turn o
ff the Zero-Copy I/O protocol
_shared_io_pool_size
and _shared_iop_max_size
Also see:
Oracle Database Documentation : LOB Performance Guidelines
Labels: oracle lob bfile blob securefile rdbms database tips performance clob
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