ORA-00839: SGA_TARGET cannot be modified to the specified value

文档解释

ORA-00839: SGA_TARGET cannot be modified to the specified value

Cause: The specified value of SGA_TARGET was not compatible with current settings of PGA_AGGREGATE_TARGET and MEMORY_TARGET/MEMORY_MAX_TARGET.

Action: Set SGA_TARGET to be no more than the difference of MEMORY_TARGET/MEMORY_MAX_TARGET and PGA_AGGREGATE_TARGET. Also ensure that the current PGA memory used for non-auto workareas is low.

官方解释

ORA-00839：指示当前设置的SGA_TARGET值无法被修改为指定的值。

正常处理方法及步骤

1.先检查在修改参数之前，当前的参数值是否正确，以及当前参数是否已经被其它用户或进程锁定。

2.检查SGA_TARGET，确保当前主机的内存空间足够支持SGA_TARGET被修改为需要的值。

3.重新登录数据库，再次尝试调整参数。

4.如果问题仍未解决，请联系数据库管理员。