Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE
Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE
Oracle RAC on RedHat Linux Best Practice guide and ... - OpenMPE
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<str<strong>on</strong>g>Oracle</str<strong>on</strong>g> VLM using shmfs or ramfs<br />
• For SGA sizes >2.7 GB, <str<strong>on</strong>g>Oracle</str<strong>on</strong>g> needs to allocate<br />
parts of the SGA through a memory mapped file<br />
system called shmfs.<br />
− The difference between both memory file system is that<br />
shmfs is pageable, ramfs is not<br />
− The init.ora parameter “use_indirect_data_buffers”<br />
determines whether <str<strong>on</strong>g>Oracle</str<strong>on</strong>g> will allocate memory<br />
through tmpfs. Set to true to enable the use of shmfs.<br />
• use_indirect_data_buffers=true<br />
• Only database buffers may reside in the<br />
shmfs/ramfs memory area. All other parts of the<br />
<str<strong>on</strong>g>Oracle</str<strong>on</strong>g> SGA must still reside in regular <str<strong>on</strong>g>Oracle</str<strong>on</strong>g><br />
shared memory.<br />
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