Advantage of Blobspaces over Dbspaces

When you store simple large objects in a blobspace on a separate disk from the table with which it is associated, the database server provides the following performance advantages:

• You have parallel access to the table and simple large objects.
• Unlike simple large objects stored in a dbspace, blobspace data is written directly to disk. Simple large objects do not pass through resident shared memory, which leaves memory pages free for other uses.
• Simple large objects are not logged, which reduces logging I/O activity for logged databases.

For more information, see Storing Simple Large Objects in the Tblspace or a Separate Blobspace.