验证concepts中关于sga_target与sg…

os：OEL 5.8
version: oracle 11gR2


##对于sga_target大小不能大于sga_max_size
SQL> show parameter sga

NAME<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> TYPE<wbr><wbr><wbr> VALUE<br> ------------------------------------ ----------- ------------------------------<br> lock_sga<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> boolean<wbr><wbr><wbr> FALSE<br> pre_page_sga<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> boolean<wbr><wbr><wbr> FALSE<br> sga_max_size<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> big integer 224M<br> sga_target<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> big integer 224M<br><br> SQL&gt;<wbr> alter system set sga_target=225;<br><wbr>alter system set sga_target=225<br> *<br> ERROR at line 1:<br> ORA-02097: parameter cannot be modified because specified value is invalid<br> ORA-00827: could not shrink sga_target to specified value<br><br><br> SQL&gt; alter system set sga_target=225m;<br> alter system set sga_target=225m<br> *<br> ERROR at line 1:<br> ORA-02097: parameter cannot be modified because specified value is invalid<br> ORA-00823: Specified value of sga_target greater than sga_max_size<br><br style="font-weight: bold;"><span style="font-weight: bold;">##在startup时，sga_target可以大于sga_max_size，并且sga_max_size自动会调整和sga_target一样大</span><br><br> SQL&gt; show parameter sga<br><br> NAME<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> TYPE<wbr><wbr><wbr> VALUE<br> ------------------------------------ ----------- ------------------------------<br> lock_sga<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> boolean<wbr><wbr><wbr> FALSE<br> pre_page_sga<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> boolean<wbr><wbr><wbr> FALSE<br> sga_max_size<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> big integer 224M<br> sga_target<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> big integer 224M<br><br> SQL&gt; alter system set sga_target=225m scope=spfile;<br><br> System altered.<br><br> SQL&gt; srartup force<br> SP2-0734: unknown command beginning "srartup fo..." - rest of line ignored.<br> SQL&gt; startup force<br> ORACLE instance started.<br><br> Total System Global Area<wbr> 238530560 bytes<br> Fixed Size<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 1335724 bytes<br> Variable Size<wbr><wbr><wbr><wbr><wbr><wbr><wbr> 109055572 bytes<br> Database Buffers<wbr><wbr><wbr><wbr> 125829120 bytes<br> Redo Buffers<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> 2310144 bytes<br> Database mounted.<br> Database opened.<br> SQL&gt; show parameter sga<br><br> NAME<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> TYPE<wbr><wbr><wbr> VALUE<br> ------------------------------------ ----------- ------------------------------<br> lock_sga<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> boolean<wbr><wbr><wbr> FALSE<br> pre_page_sga<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr> boolean<wbr><wbr><wbr> FALSE<br> sga_max_size<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>