关于Oracle 数据库12.1.0.2的新参数EXAFUSION_ENABLED

发布时间：2020-12-12 15:47:02 所属栏目：百科来源：网络整理

导读：12.1新参数EXAFUSION_ENABLED http://docs.oracle.com/database/121/REFRN/GUID-A0612249-0A65-476D-A2B8-FA94DF5EEC7F.htm#REFRN-GUID-A0612249-0A65-476D-A2B8-FA94DF5EEC7F EXAFUSION_ENABLEDisusedtoenableordisabletheExafusionacceleratecachefusionpr

12.1新参数EXAFUSION_ENABLED
http://docs.oracle.com/database/121/REFRN/GUID-A0612249-0A65-476D-A2B8-FA94DF5EEC7F.htm#REFRN-GUID-A0612249-0A65-476D-A2B8-FA94DF5EEC7F

EXAFUSION_ENABLEDisusedtoenableordisabletheExafusionacceleratecachefusionprotocolfeature, whichisavailableontheLinuxoperatingsystemofOracleExadataDatabaseMachineonly. Exafusionprovideslowerlatency,higherthroughputdirecttowireblocktransfersbetweenOracleRealApplicationClusters(OracleRAC)instances. DataistransferreddirectlyfromuserspacetotheInfinibandnetwork,leadingtoreducedCPUutilizationandbetterscale-outperformance.

These are the prerequisites before enabling Exafusion:

Oracle Storage Server Software release 12.1.2.1.1 or later is required.
Mellanox ConnectX-2 and ConnectX-3 Host Channel Adapters (HCAs) are required.
Oracle Unbreakable Enterprise Kernel 2 Quarterly Update 5 (UEK2QU5) kernels (2.6.39-400.2nn) or later are required.

The Exafusion feature does not support mixed mode operation on an Oracle RAC cluster. Either all the instances in an Oracle RAC cluster must have the feature enabled or none. Rolling upgrades of a non-Exafusion enabled Oracle RAC cluster to Exafusion are not supported.

Note:

Exafusion is available only on the Linux operating system of Oracle Exadata Database Machine. It is not supported on any non-engineered system or SPARC SuperCluster (SSC). If you set theEXAFUSION_ENABLEDparameter on a non-supported platform,then the instance will be prevented from starting up,and anORA-00439:The specified feature is not enabled:stringerror message is generated.

Note:

This initialization parameter is available starting with Oracle Database 12c Release 1 (12.1.0.2) Bundle Patch 11 (BP11).

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