A NOCYCLE sequence

 A NOCYCLE sequence

SQL> -- A NOCYCLE sequence
SQL>
SQL>
SQL> CREATE SEQUENCE StudentNumSeq
  2 INCREMENT BY 50000
  3 START WITH 50000
  4 MAXVALUE 99999
  5 NOCACHE
  6 NOCYCLE;

Sequence created.

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A CYCLE sequence

 A CYCLE sequence

SQL> -- A CYCLE sequence
SQL>
SQL>
SQL> CREATE SEQUENCE StudentNumSeq
  2 INCREMENT BY 50000
  3 START WITH 50000
  4 MAXVALUE 99999
  5 NOCACHE
  6 CYCLE;

Sequence created.

SQL>
SQL>
SQL> select studentNumSeq.nextVal from dual;

  NEXTVAL
----------
  50000

SQL> select studentNumSeq.nextVal from dual;

  NEXTVAL
----------
  1

SQL> select studentNumSeq.nextVal from dual;

  NEXTVAL
----------
  50001

SQL>
SQL>
SQL> drop sequence studentNumSeq;



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NOCYCLE sequence

SQL> -- A NOCYCLE sequence
SQL>
SQL>
SQL> CREATE SEQUENCE StudentNumSeq
  2 INCREMENT BY 50000
  3 START WITH 50000
  4 MAXVALUE 99999
  5 NOCACHE
  6 NOCYCLE;

Sequence created.

SQL>
SQL>
SQL> select studentNumSeq.nextVal from dual;

  NEXTVAL
----------
  50000

SQL> select studentNumSeq.nextVal from dual;
select studentNumSeq.nextVal from dual
  *
ERROR at line 1:
ORA-08004: sequence STUDENTNUMSEQ.NEXTVAL exceeds MAXVALUE and cannot be instantiated


SQL> select studentNumSeq.nextVal from dual;
select studentNumSeq.nextVal from dual
*
ERROR at line 1:
ORA-08004: sequence STUDENTNUMSEQ.NEXTVAL exceeds MAXVALUE and cannot be instantiated


SQL>
SQL>
SQL> drop sequence studentNumSeq;

Sequence dropped.


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Sequence cache option

Sequence cache option 

SQL> -- the cache option specifies how many sequence values will be stored in memory for
faster access
SQL>
SQL>
SQL> CREATE SEQUENCE mySequence
  2 MINVALUE 1
  3 MAXVALUE 999999999999999999999999999
  4 START WITH 1
  5 INCREMENT BY 1
  6 CACHE 20;

Sequence created.

SQL>
SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  1

SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  2

SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  3


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Alter sequence increment

 Alter sequence increment

SQL> CREATE SEQUENCE mySequence
  2 MINVALUE 1
  3 MAXVALUE 999999999999999999999999999
  4 START WITH 1
  5 INCREMENT BY 1
  6 CACHE 20;

Sequence created.

SQL>
SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  1

SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  2

SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  3

SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  4

SQL>
SQL> alter sequence mySequence
  2 increment by 124;

Sequence altered.

SQL>
SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  128

SQL>
SQL> alter sequence mySequence
  2 increment by 1;

Sequence altered.

SQL>
SQL> select mySequence.nextval from dual;

  NEXTVAL
----------
  129

SQL>
SQL>
SQL> drop sequence mySequence;

Sequence dropped.

SQL>
SQL>


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Sequence Example 1

SQL> CREATE SEQUENCE supplier_seq
  2 MINVALUE 1
  3 MAXVALUE 999999999999999999999999999
  4 START WITH 1
  5 INCREMENT BY 1
  6 CACHE 20;

Sequence created.

SQL>
SQL> select supplier_seq.nextval from dual;

  NEXTVAL
----------
  1

SQL> select supplier_seq.nextval from dual;

  NEXTVAL
----------
  2

SQL> select supplier_seq.nextval from dual;

  NEXTVAL
----------
  3

SQL> select supplier_seq.nextval from dual;

  NEXTVAL
----------
  4

SQL>
SQL> drop sequence supplier_seq;

Sequence dropped.


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