You can useSHARDwithCACHEandNOCACHEmodes of operation. Examples Modifying a Sequence: Examples This statement sets a new maximum value for thecustomers_seqsequence, which was created in"Creating a Sequence: Example": ALTER SEQUENCE customers_seq MAXVALUE 1500; ...
在Oracle中，对sequence进行修改的前提是你必须是该sequence的所有者，或者拥有ALTER ANY sequence的权限。对于sequence的参数调整，除了start值之外，你都可以进行操作。例如，如果你想增加序列值的增量为10，最大值设置为10000，并启用循环模式（即达到最大值后重新从头开始），可以使用以下命令：ALTER sequen...
ALTER SEQUENCE sequence_name CACHE new_cache_value; 其中sequence_name是要修改的序列对象的名称,CACHE关键字后面是新的缓存值。例如: ALTER SEQUENCE seq_employee CACHE 50; 上述语句将序列seq_employee的缓存值修改为50。 三、总结 通过以上详细介绍,我们了解了Oracle数据库中ALTER SEQUENCE语法的用法和相关注意事...
在Oracle中,序列venseq使用下面的语句创建: 下面对序列venseq修改的语句,错误的是()A.ALTERSEQUENCEvenseqSTARTWITH1;B
Oracle Database performs some validations. For example, a newMAXVALUEcannot be imposed that is less than the current sequence number. Examples Modifying a Sequence: Examples This statement sets a new maximum value for thecustomers_seqsequence, which was created in"Creating a Sequence: Example": ...
在Oracle中,序列venseq使用下面的语句创建:CREATE SEQUENCE venseq INCREMENT BY 1 START WITH 10 MAXVALUE 100 MINVALUE 10 CYCLE CACHE 5;下面对序列venseq修改的语句,错误的是( )。 A. ALTER SEQUENCE venseq START WITH 1; B. ALTER SEQUENCE venseq MAXVALUE 90; C. ALTER SEQUENCE venseq NOMINVALUE...
However, this keyword is not compatible with Oracle databases. cache The CACHE cache clause is optional and specifies the number of sequence numbers to be preallocated and stored in memory for fast access. The minimum value is 1, indicating that only one value NOCACHE can be generated at a...
ALTER SEQUENCE更改一个现有序列发生器的参数。 任何没有在ALTER SEQUENCE命令中明确设置的参数保持它们之前的设置。 要使用ALTER SEQUENCE,你必须拥有该序列。要更改一个序列的模式,你还必须拥有新模式上的CREATE特权。要更改拥有者,你还必须是新拥有角色的一个直接或者间接成员,并且该角色必须具有该域的模式上的 CREAT...
SQL> 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>...
ALTERSEQUENCEsequence_name[MINVALUEvalue|NOMINVALUE][MAXVALUEvalue|NOMAXVALUE][INCREMENTBYvalue][CACHEvalue|NOCACHE][ORDER|NOORDER][CYCLE|NOCYCLE]; Parameter description Examples Modify the maximum value of the auto-increment column my_sequence and specify that the values of the auto-increment column...