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Oracle Tips by Burleson

Oracle9i Tablespace Changes

• Oracle managed – In addition to the benefits of not needing to create filenames and define specific storage requirements, managed files provide the additional advantage of being deleted from the operating system when the DROP TABLESPACE statement is executed. But these benefits do not outweigh the disadvantage of losing the flexibility of specifying different mountpoints or drives manually. Most administrators will prefer to have the flexibility of placing files on different drives or mountpoints and to not be forced into using one directory specification (whether that directory is striped or not).
   

• Multiple block sizes – Multiple blocksize specifications allow administrators to tailor physical storage specifications to a data object’s size and usage to maximize I/O performance. In addition, it also allows administrators to easily use the transportable tablespace feature to transfer tablespaces between databases having different default blocksizes (i.e. moving data from an OLTP application to a data warehouse).
   

• Locally managed – Oracle is highly recommending that locally managed tablespaces be used for all tablespaces. Because extent management is tracked internally, the need to coalesce tablespaces is no longer required. In addition, allocating or releasing space in a locally managed tablespace avoids recursive space management operations (updates to data dictionary tables that track space utilization). Oracle also states that data objects with high numbers of extents have less of a performance impact on locally managed tablespaces than they do on their dictionary managed counterparts.

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