The DB_BLOCK_SIZE initialization parameter specifies the standard block size for the
database. This block size is used for the SYSTEM tablespace and by default in other
tablespaces. Oracle Database can support up to four additional nonstandard block
sizes.
指定数据块大小
1. DB_BLOCK_SIZE指定标准块大小
2. 指定了system表空间和其他默认表空间的块大小
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