OMF and to what extent the management

I have a few questions about OMF, missmanagement and go to 10g:

(1) if I mostly BLOB data, it would be better to create a bigfile tablespace or not?
(2) for the management of the measure, should I do allocate local?
(3) if I use the OMF, can I still specify autoextend for the data files?
(4) if I create a storage space for the BLOB data, which would be a good idea? Then do everything else in another space, or one doesn't do that?

1. you probably don't use bigfile tablespaces, less that the total size of the storage space exceeds the maximum size allowed for a database based on the Oracle block size (32 G for 8 k) and use of several data files to support a tablespace is not desired.

Only if the object is actually going to be very important and the total number or size of the files needed in support of your database can be a problem should you consider using a bigfile tablespace. If all of the LOB data will be in the range of Teragbyte so yes.

2. Yes, you must use a locally managed tablespace. Automatic assignment would probably be good. Auto-allocagte takes into account the extensive application and spend more of 64 degrees k and 1 M if the initial allocation is sufficient.

3. I think so.

4 - If you need a space for the BLOB data will depend on the expected total size, your decision to point 1 above, and if you want to use uniform extensions on the base table or lob segment that are either different in the size of each other or you want to use auto-allouer for but not the other.

The segment size is very important with LOB space use/reuse. With 11g, you can convert files secured basic file usage (10g and below CLOB and BLOB segments) to get best performance and storage methods, used internally by Oracle.

HTH - Mark D Powell.

Tags: Database

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