In Oracle 12 c, we can modify generated sequence implicitly as part of the identity column.

Hi people,

Please review below,

SQL> select * from v$version;

BANNER        

Have a Identity column created.                                                                                                                                                                                                                                                                                                                                                                          Oracle Database 12c Enterprise Edition Release 12.1.0.1.0 - 64bit Production                                                                                                                                                                                                                                                         PL/SQL Release 12.1.0.1.0 - Production                                                                                                                                                                                                                                                                                                                           CORE 12.1.0.1.0 Production                                                                                                                                                                                                                                                                                                                                                 TNS for 64-bit Windows: Version 12.1.0.1.0 - Production                                                                                                                                                                                                                                                                                               NLSRTL Version 12.1.0.1.0 - Production                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 SQL> @1;
TABLE_NAME           COLUMN_NAME     GENERATION IDENTITY_OPTIONS                                    
-------------------- --------------- ---------- --------------------------------------------------  
IDENTITY_TEST_1      ID              ALWAYS     START WITH: 1, INCREMENT BY: 1, MAX_VALUE: 9999999  
                                                999999999999999999999, MIN_VALUE: 1, CYCLE_FLAG: N  
                                                , CACHE_SIZE: 20, ORDER_FLAG: N                     

SQL> @1;

TABLE_NAME           SEQUENCE_NAME                                                                  
-------------------- ------------------------------                                                 
IDENTITY_TEST_1      ISEQ$$_92327                                                                   

Trying to alter Cache value of sequence.

from SYSDBA 

SQL> alter sequence ISEQ$$_92327 CACHE 1000;
alter sequence ISEQ$$_92327 CACHE 1000
*
ERROR at line 1:
ORA-02289: sequence does not exist 

From Owner Schema

Error starting at line 4 in command:
alter sequence ISEQ$$_92327 CACHE 1000
Error report:
SQL Error: ORA-32793: cannot alter a system-generated sequence

Altering was not an option.

By default oracle set Cache size to 20 for the internal sequence implicitly created as part of the identity column.

Suppose that a scenario were we now upgrade the value of the sequence Cache to avoid performance problems (line cache lock wait event!).

Is it possible to change the sequence of the underlying If yes how?

If NOT then no solution to workaround or Expert thought about even?

Thank you

Deepak M.

The ALTER TABLE command.

CREATE TABLE t1
(id          NUMBER GENERATED ALWAYS AS IDENTITY,
 description VARCHAR2(30));

table T1 created.

select * from user_tab_identity_cols where table_name = 'T1';

TABLE_NAME COLUMN_NAME GENERATION_TYPE SEQUENCE_NAME IDENTITY_OPTIONS
---------- ----------- --------------- ------------- ------------------------------------------------------------------------------------------------------------------------------------
T1         ID          ALWAYS          ISEQ$$_96257  START WITH: 1, INCREMENT BY: 1, MAX_VALUE: 9999999999999999999999999999, MIN_VALUE: 1, CYCLE_FLAG: N, CACHE_SIZE: 20, ORDER_FLAG: N 

alter table t1 modify id generated always as identity (INCREMENT BY 10 CACHE 100);

table T1 altered

select * from user_tab_identity_cols where table_name = 'T1';

TABLE_NAME COLUMN_NAME GENERATION_TYPE SEQUENCE_NAME IDENTITY_OPTIONS
---------- ----------- --------------- ------------- -------------------------------------------------------------------------------------------------------------------------------------
T1         ID          ALWAYS          ISEQ$$_96257  START WITH: 1, INCREMENT BY: 10, MAX_VALUE: 9999999999999999999999999999, MIN_VALUE: 1, CYCLE_FLAG: N, CACHE_SIZE: 100, ORDER_FLAG: N

Tags: Database

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