Oracle资料之sequence表

最新推荐文章于 2024-05-03 11:07:01 发布

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本文详细介绍了Oracle数据库中序列(sequence)的管理方式，包括ALL_SEQUENCES、DBA_SEQUENCES和USER_SEQUENCES三个视图的功能及使用场景，并对各字段如SEQUENCE_OWNER、SEQUENCE_NAME等进行了详细解释。

◆ ALL_SEQUENCES

ALL_SEQUENCES记录了当前用户所有的sequence信息。（ALL_SEQUENCES describes all sequences accessible to the current user.）

◆ Related Views

• DBA_SEQUENCES记录了数据库中所有的sequence信息。（DBA_SEQUENCES describes all sequences in the database.）
• USER_SEQUENCES记录了数据库中当前用户的sequence信息，但视图中不包含SEQUENCE_OWNER列。（USER_SEQUENCES describes all sequences owned by the current user. This view does not display the SEQUENCE_OWNER column）

◆ 字段信息：

Column	Datatype	NULL	Description
SEQUENCE_OWNER	VARCHAR2(30)	NOT NULL	Name of the owner of the sequence
SEQUENCE_NAME	VARCHAR2(30)	NOT NULL	Sequence name
MIN_VALUE	NUMBER		Minimum value of the sequence
MAX_VALUE	NUMBER		Maximum value of the sequence
INCREMENT_BY	NUMBER	NOT NULL	Value by which sequence is incremented
CYCLE_FLAG	VARCHAR2(1)		Does sequence wrap around on reaching limit
ORDER_FLAG	VARCHAR2(1)		Are sequence numbers generated in order
CACHE_SIZE	NUMBER	NOT NULL	Number of sequence numbers to cache
LAST_NUMBER	NUMBER	NOT NULL	Last sequence number written to disk. If a sequence uses caching, the number written to disk is the last number placed in the sequence cache. This number is likely to be greater than the last sequence number that was used.