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<HEAD><TITLE>FAQ汇萃 >> Oracle 专栏 >> ORACLE  SGA  的分配</title>
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<a href=http://www.jsp001.com/list_thread.php?int_attribute=1>FAQ汇萃</a>
>> <a href=http://www.jsp001.com/list_thread.php?forumid=20&int_attribute=1>Oracle 专栏</a>
>> ORACLE  SGA  的分配 [<a href=http://www.jsp001.com/forum/showthread.php?goto=newpost&threadid=307>查看别人的评论</a>]<br>

<hr><p>由 webmaster 发布于: 2001-02-07 14:22</p><p><img src="images/icons/icon12.gif" alt="Wink" border=0> </p><p>ORACLE 8.0.X 版本<br><br>SGA=((db_block_buffers * block size)+(shared_pool_size+large_pool_size+log_buffers)+1MB<br><br>ORACLE 8.1.X 版本<br><br>SGA=((db_block_buffers * block size)+(shared_pool_size+large_pool_size+java_pool_size+log_buffers)+1MB<br><br>理论上SGA可占OS系统物理内存的1/2——1/3，我们可以根据需求调整<br><br>SUN Solaris里/etc/system文件里的几个参数同样跟内存分配有关<br><br>ORACLE安装时缺省的设置: 建议修改的设置: <br>set shmsys:shminfo_shmmax=4294967295 <br>set shmsys:shminfo_shmmin=1 <br>set shmsys:shminfo_shmmni=100 <br>set shmsys:shminfo_shmseg=15 <br>set semsys:seminfo_semmns=200 <br>set semsys:seminfo_semmni=70 <br>set ulimit=3000000  <br>set semsys:seminfo_semmni=315<br>set semsys:seminfo_semmsl=300<br>set semsys:seminfo_semmns=630<br>set semsys:seminfo_semopm=315<br>set semsys:seminfo_semvmx=32767<br>set shmsys:shminfo_shmmax=4294967295<br>set shmsys:shminfo_shmmni=315<br>set shmsys:shminfo_shmseg=10<br>set shmsys:shminfo_shmmin=1 <br><br>其中这些参数的含义<br><br>shmmax - 共享内存段，建议设大点， 达到最大SGA<br>shmmin - 最小的共享内存段.<br>shmmni - 共享内存标志符的数量.<br>shmseg - 一个进程可分配的最大内存段数.<br>shmall - 最大可允许的内存数，比SGA还要大.<br>semmns - 信号量，跟ORACLE的PROCESS数有关.<br>semmsl - 一个信号量中最大的信号量数.<br></p></td>
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