DB_BLOCK_SIZE Initialization
Parameter
<wbr><wbr>
The most commonly used block size should be picked as the standard
block size. In many cases, this is the only block size that you
need to specify. Typically, DB_BLOCK_SIZE<wbr> is set
to either 4K or 8K. If you<wbr> do not set a value for
this parameter, the default data block size is operating system
specific, which is generally adequate. You cannot change the block
size after database creation except by re-creating the database. If
the database block size is different from the operating system
block size, ensure that the database block size is a multiple of
the operating system block size. For example, if your operating
system block size is 2K (2048 bytes), the following setting for the
DB_BLOCK_SIZE<wbr> initialization parameter is
valid:<br>
DB_BLOCK_SIZE=4096<br><wbr><wbr><br><wbr><wbr> A larger data block size
provides greater efficiency in disk and memory I/O (access<br>
(使用较大的db_block_size对于磁盘io的提高有较大的好处)<br>
and storage of data). Therefore, consider specifying a block size
larger than your<br>
operating system block size if the following conditions
exist:<br>
■ Oracle Database is on a large computer system with a large amount
of memory and fast disk drives. For example, databases controlled
by mainframe computers with vast hardware resources typically use a
data block size of 4K or greater.<br>
■ The operating system that runs Oracle Database uses a small
operating system block size. For example, if the operating system
block size is 1K and the default data block size matches this, the
database may be performing an excessive amount of disk I/O during
normal operation. For best performance in this case, a database
block should consist of multiple operating system
blocks.<br></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>
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