How does Oracle modify the current sequence value example detail

Updated: May 10, 2024 11:28:50 Author: How can I be relieved, only...

A lot of times we use oracle sequences, so how do we change the current value of the sequence? The following article mainly introduces the relevant information about how Oracle modifies the current sequence value, the article introduces very detailed through the code, the need of friends can refer to the next

introduction

Sequence objects have three important properties: starting value, increment, and maximum value. The starting value is the first value generated by the sequence, the increment is the increment of the value generated each time by the sequence, and the maximum is the maximum that the sequence can generate. These properties can be set when the sequence is created or can be changed at any time after creation.

1. Modify the current sequence value

To modify the current value of an Oracle SEQUENCE, you can use the ALTER SEQUENCE statement. This statement needs to specify the name of the sequence and the new current value. For example, to change the current value of a sequence named my_sequence to 100, you can use the following statement:

Alter Sequence my_sequence START WITH 100;

Note that this statement only modifies the current value of the sequence and does not affect the starting value, increment, or maximum value of the sequence.

2. To modify the properties of a SEQUENCE object, you can use other options of the ALTER SEQUENCE statement.

Here are some common options:

Alter Sequence my_sequence START WITH 1; ALTER sequence my_sequence start with 1; Alter Sequence my_sequence Increment By 2; ALTER SEQUENCE my_SEQUENCE increment by 2; 2.3 Alter Sequence my_sequence Maxvalue 1000; 2.4 Alter Sequence my_sequence Cycle;

When using the above statement, please note the following:

1. The ALTER SEQUENCE statement must be executed with administrator permission.

2. Modifying the properties of a sequence object may affect other database objects that depend on the sequence, such as triggers, constraints, etc. Before making the modification, check whether other objects need to be modified.

3. Modifying the properties of the sequence object may cause the value generated by the sequence to duplicate the assigned value. Please carefully consider the impact of the changes and make necessary backups and tests.

oracle modifies the current sequence value without deleting the reconstruction step

1. Query the next value of the sequence :SELECT SEQ_NAME.NEXTVAL FROM dual;

2. If you want to change the next value of the sequence: often encounter the ID already exists, in this case, you can change the step size, so that the next execution (step 3) can reach the maximum value (remember to change back after execution); ----X can be either positive or negative

3. Query the next value of the sequence :SELECT SEQ_NAME.NEXTVAL FROM dual; - Check whether the modification is successful

Alter sequence SEQ_NAME increment BY 1; ALTER SEQUENCE SEQ_NAME increment by 1;

Ps: Oracle modifies the value of the current sequence (modifies the serial number starting from the current maximum value)

## Modify the mode

SQL:

alter sequence seq_test increment by n; select seq_test.nextval from dual; Select seq_test. Nextval from dual; alter sequence seq_test increment by 1; ALTER SEQUENCE SEQ_TEST INCREMENT by 1; - Then modify the self-increment of the sequence

Query the next value first, and then make changes. The box is your own serial number name.

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