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Donald K. Burleson

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Oracle Large Object (LOB) Storage

Actually a special form of tablespace, the large object (LOB) storage should be on fast disk resources simply due the large required sizes of most LOB data items. LOB storage should be placed away from other types of storage and should contain only LOB (LOB, CLOB, NCLOB, and BLOB) data items. In the 8.0 LOB environment you could specify separate storage for LOB segments and their associated LOB indexes, in 8i and greater they are collocated so don't forget to allow for the LOB and its associated LOB index.

Oracle BFILE Storage

A BFILE is a pointer to an external LOB file. Generally, the same considerations given to LOB storage will apply to the storage areas that BFILEs point toward. BFILEs themselves are just internal pointers to external files and don't require storage areas.

Oracle and Disk Usage

One of the major arguments against relational database systems has been speed. It has been said that relational systems are slow. It has been found, however, that with proper tuning of Oracle applications and operating system, as well as proper file placement, Oracle performance is excellent. In fact I have seen Oracle8i deliver subsecond response times even when searching tables containing billions of rows (yes, I said billions.) Conversely, if you try to place Oracle on an insufficient number of disks, performance will suffer.


This is an excerpt by Mike Ault’s book “Oracle Administration & Management”.  If you want more current Oracle tips by Mike Ault, check out his new book “Mike Ault’s Oracle Internals Monitoring & Tuning Scripts” or Ault’s Oracle Scripts Download.

 

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