如何查看，更改隐含参数

可以使用如下脚本查看隐含参数
SELECT x.ksppinm NAME, y.ksppstvl VALUE, x.ksppdesc describ
FROM SYS.x$ksppi x, SYS.x$ksppcv y
WHERE x.inst_id = USERENV ('Instance')
AND y.inst_id = USERENV ('Instance')
AND x.indx = y.indx
AND x.ksppinm LIKE '%&par%'
/

例如我要查看 _shared_pool_reserved_min_alloc隐含参数

SQL> SELECT x.ksppinm NAME, y.ksppstvl VALUE, x.ksppdesc describ
2 FROM SYS.x$ksppi x, SYS.x$ksppcv y
3 WHERE x.inst_id = USERENV ('Instance')
4 AND y.inst_id = USERENV ('Instance')
5 AND x.indx = y.indx
6 AND x.ksppinm LIKE '%&par%'
7 /
Enter value for par: _shared_pool_reserved_min
old 6: AND x.ksppinm LIKE '%&par%'
new 6: AND x.ksppinm LIKE '%_shared_pool_reserved_min%'

NAME VALUE DESCRIB
----------------------------------- ---------- ------------------------------
_shared_pool_reserved_min_alloc 4100 minimum allocation size in bytes for reserved area of shared pool

修改隐含参数

SQL> alter system set "_shared_pool_reserved_min_alloc"=4400 scope=spfile;

System altered.