DB_BLOCK_BUFFERS specifies the number of database buffers in the buffer cache. It is one
of several parameters that contribute to the total memory requirements of the SGA of an
instance.
This parameter, together with DB_BLOCK_SIZE, determines the total size of the buffer
cache. Effective use of the buffer cache can greatly reduce the I/O load on the database. DB_
BLOCK_SIZE can be specified only when the database is first created, so you use DB_
BLOCK_BUFFERS to control the size of the buffer cache.
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看来你得重新建库了!