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- Extent Allocation and Deallocation
SQL> alter table xxx allocation extent (size 1m datafile 'xxx');
SQL> alter table xxx deallocation unused; -
- Database Block
(1) set at tablespace creation
SQL> create tablespace kong2 datafile 'xxx' blocksize 8k; (必须指定db_8k_cache_size)
(2)DB_BLOCK_SIZE is the default block size -
initrans maxtrans
pctfree: 导致row migration(系统开销)
pctused:通知可以再使用
- Configuring Automatic Segment-Space Management
SQL> create tablespace xxx ... SEGMENT SPACE MANAGEMENT AUTO; - Manual Segment Space Management (pctfree,pctused,freelist)