修改oracle的SGA区大小

SQL> show sga

　　Total System Global Area 2602007792 bytes

　　Fixed Size 740592 bytes

　　Variable Size 335544320 bytes

　　Database Buffers 2264924160 bytes

　　Redo Buffers 798720 bytes

　　SQL> alter system set sga_max_size=5000m scope=spfile;

　　System altered.

　　SQL> shutdown immediate;

　　SQL> startup

　　SQL> show sga

　　Total System Global Area 5252811728 bytes

　　Fixed Size 744400 bytes

　　Variable Size 2986344448 bytes

　　Database Buffers 2264924160 bytes

　　Redo Buffers 798720 bytes