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Editorial Team
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Asked: 2026-06-14T23:10:10+00:00

The basic syntax for creating a sequence generator for oracle database table attribute is:

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The basic syntax for creating a sequence generator for oracle database table attribute is:

CREATE SEQUENCE customers_seq
START WITH     1000
INCREMENT BY   1
NOCACHE
NOCYCLE;

I would like to know what does the NOORDER clause in the SEQUENCE syntax do? If I include the NOORDER clause, will it give me a sequence keeping the increment value random???

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  1. Editorial Team

    This is important when running in parallel server mode or in a cluster. ORDER guarantees that the sequences numbers are ordered. 

    Example of “noorder” sequence in 10g RAC:

Session 1 on node-A: nextval -> 101
Session 2 on node-A: nextval -> 102
Session 1 on node-B: nextval -> 121
Session 1 on node-B: nextval -> 122
Session 1 on node-A: nextval -> 103
Session 1 on node-A: nextval -> 104

    NOORDER in combination with CACHING sequences results in this behavior. ORDER effectively makes the CACHE setting unused. With caching set to 10 when a session gets a sequences it takes 10 sequences into it’s cache.

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