【翻译自mos文章】升级到11.2.0.4之后在alert日志中出现 NUMA 警告信息

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升级到11.2.0.4之后在alert日志中出现 NUMA 警告信息

翻译自mos文章：NUMA warning message appear after upgrade to 11.2.0.4 (文档 ID 1600824.1)1

适用于：

Oracle Database - Enterprise Edition - Version 11.2.0.4 and later

Information in this document applies to any platform.

症状：

在升级到11.2.0.4之后，在database startup之后，下面的警告信息会生成：

Starting ORACLE instance (normal)
LICENSE_MAX_SESSION = 0
LICENSE_SESSIONS_WARNING = 0
Initial number of CPU is 1
Number of processor cores in the system is 8
Number of processor sockets in the system is 2
Shared memory segment for instance monitoring created
CELL communication is configured to use 0 interface(s):
CELL IP affinity details:
    NUMA status: NUMA system w/ 2 process groups
    cellaffinity.ora status: cannot find affinity map at '/etc/oracle/cell/network-config/cellaffinity.ora' (see trace file for details)
CELL communication will use 1 IP group(s):
    Grp 0: 
Picked latch-free SCN scheme 3
Autotune of undo retention is turned on.

变化：

升级到11.2.0.4

原因：

默认情况下，在11.2中，NUMA是被关闭的，但是如果在你的os级别启用了NUMA，并且如果_enable_NUMA_support = FALSE 的话，Oracle 只会检测（detect）到NUMA 而不会使用NUMA。

这个在bugBug:17475024中讨论过。closed as duplicate of Bug:16613964 where alerts like below displayed on non-Exadata setup:

CELL IP affinity details:
    NUMA status: NUMA system w/ 2 process groups
    cellaffinity.ora status: cannot find affinity map at '...' (see trace file for details)
CELL communication will use 1 IP group(s):
    Grp 0:

解决方案：

- Apply Patch:16613964 if available for your DBVersion and Platform.

or Upgrade to 12.1 where the issus is fixed

No Workarounds are available