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Oracle sequence Mechanism

Source: Internet
Author: User
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Today, I am going to process a piece of data and discover a problem in the Oracle sequence. I am prepared to clarify this problem in the spirit of discovering, solving, and asking the root question.

 

Problems and phenomena:

For sequences, seq is obtained every time according to our understanding. nextval, Which is auto-incrementing, must be larger than the first database, but one of my log tables has the following symptoms:

 

LOGID CREATETIME

1 73000915:41:14

2 729988 15:37:53

3 729978 15:34:53

4 72996115:43:22

5 729958 15:33:52

6 729951 15:31:38

7 729944 15:11:00

8 729941 15:10:30

Note the following red content to check whether the time and sequence size are misplaced. Among them, the time is correct and the execution sequence is the same as that of me.

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