修改PDB的参数

在修改pdb的参数之前，要确认该参数在pdb级别是否可以修改，通过查询v$parameter里面的ispdb_modifiable

SYS@test>select name,ispdb_modifiable from v$parameter where name = 'undo_retention';

NAME		     ISPDB
-------------------- -----
undo_retention	     TRUE

SYS@test>

select con_id,value from v$system_parameter where name ='undo_retention';

SYS@test>select con_id,value from v$system_parameter where name ='undo_retention';

    CON_ID VALUE
---------- ----------
	 0 1800
	 3 900

SYS@test>show pdbs

    CON_ID CON_NAME			  OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
	 2 PDB$SEED			  READ ONLY  NO
	 3 PDB1 			  READ WRITE NO
	 4 PDB2 			  READ WRITE NO
SYS@test>

修改PDB2的该参数为1200

SYS@test>alter session set container=pdb2;

Session altered.

SYS@test>show parameter undo_retention 

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
undo_retention			     integer	 1800
SYS@test>alter system set undo_retention=1200;

System altered.

SYS@test>show parameter undo_retention;

NAME				     TYPE	 VALUE
------------------------------------ ----------- ------------------------------
undo_retention			     integer	 1200
SYS@test>

进行验证

SYS@test>alter session set container=cdb$root;

Session altered.

SYS@test>show pdbs

    CON_ID CON_NAME			  OPEN MODE  RESTRICTED
---------- ------------------------------ ---------- ----------
	 2 PDB$SEED			  READ ONLY  NO
	 3 PDB1 			  READ WRITE NO
	 4 PDB2 			  READ WRITE NO
SYS@test>select con_id,value from v$system_parameter where name ='undo_retention';

    CON_ID VALUE
---------- ----------
	 0 1800
	 3 900
	 4 1200

SYS@test>

end

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