[Oracle] [37] SEQUENCE growth since serialization

Preface:

In the project, we sometimes need to make a field from growth, if every time after reading out from the database, plus a fixed value, one is too much trouble, and second, there is a time difference may result in inaccurate data. SEQUENCE can be defined in the database

text:

1. Create

The CREATE the SEQUENCE seqTest 
the INCREMENT BY  1  - each addition Several 
the START the WITH  1  - start counting from 1 
NOMAXVALUE - does not set the maximum value of 
the NOCYCLE - has been accumulated, the cycle is not 
the CACHE 10 ; - setting buffer cache sequences, so to obtain faster. However, if the system is down or otherwise will lead to a sequence of discrete, it may be provided to NOCACHE

2, using

seqtest.currval: Returns the current value. To use after the first nextval initialization, otherwise it will error

Value increase, and increase the return: seqtest.nextval

INSERT  INTO table_name (ID, name) values (seqTest.Nextval, ' Sequence insertion test ' );

3, change the parameters

We have ALTER ANY SEQUENCE privileges to change sequence; all parameters except the start can be modified; if you want to change the start value, you must drop sequence and then re-create (delete and re-create).

alter sequence seqTest maxvalue 9999999;

4, delete

DROP SEQUENCE seqTest; 

Reference blog:

ORACLE SEQUENCE usage - wretched Dian Yu Wei - blog Park
https://www.cnblogs.com/hyzhou/archive/2012/04/12/2444158.html