在AIX下為Oracle調整網路引數

hooca發表於2014-10-10
AIOracle
參考聯機文件，不僅適用於RAC架構。

2.4.3 Configure Network Tuning Parameters

Verify that the network tuning parameters shown in the following table are set to the values shown or higher values. The procedure following the table describes how to verify and set the values.

Network Tuning Parameter Recommended Value
ipqmaxlen 512
rfc1323 1
sb_max 2*655360
tcp_recvspace 65536
tcp_sendspace 65536
udp_recvspace 655360

Note: The recommended value of this parameter is 10 times the value of the udp_sendspace parameter. The value must be less than the value of the sb_max parameter.

udp_sendspace 65536

Note: This value is suitable for a default database installation. For production databases, the minimum value for this parameter is 4 KB plus the value of the database DB_BLOCK_SIZE initialization parameter multiplied by the value of the DB_MULTIBLOCK_READ_COUNTinitialization parameter:

(DB_BLOCK_SIZE * DB_MULTIBLOCK_READ_COUNT) + 4 KB


To view the current value specified for these parameters, and to change them if necessary:

  1. To check the current values of the network tuning parameters, enter commands similar to the following: 

    # /usr/sbin/no -a | more

  2. If you must change the value of any parameter, then enter the following command to determine whether the system is running in compatibility mode: 

    # /usr/sbin/lsattr -E -l sys0 -a pre520tune

    If the system is running in compatibility mode, then the output is similar to the following, showing that the value of the pre520tune attribute is enable: 

    pre520tune enable Pre-520 tuning compatibility mode True

  3. If the system is running in compatibility mode, then follow these steps to change the parameter values:

    1. Enter commands similar to the following to change the value of each parameter: 

      # /usr/sbin/no -o parameter_name=value

      For example: 

      # /usr/sbin/no -o udp_recvspace=655360

    2. Add entries similar to the following to the /etc/rc.net file for each parameter that you changed in the previous step: 

      if [ -f /usr/sbin/no ] ; then
   /usr/sbin/no -o udp_sendspace=65536
   /usr/sbin/no -o udp_recvspace=655360
   /usr/sbin/no -o tcp_sendspace=65536
   /usr/sbin/no -o tcp_recvspace=65536
   /usr/sbin/no -o rfc1323=1
   /usr/sbin/no -o sb_max=2*655360
   /usr/sbin/no -o ipqmaxlen=512
fi

      By adding these lines to the /etc/rc.net file, the values persist when the system restarts.

  4. If the system is not running in compatibility mode, then enter commands similar to the following to change the parameter values:

    • ipqmaxlen parameter: 

      /usr/sbin/no -r -o ipqmaxlen=512

    • Other parameter: 

      /usr/sbin/no -p -o parameter=value

    Note:

    If you modify the ipqmaxlen parameter, then you must restart the system.

    These commands modify the /etc/tunables/nextboot file, causing the attribute values to persist when the system restarts.

來自 “ ITPUB部落格 ” ，連結：http://blog.itpub.net/22621861/viewspace-1294382/，如需轉載，請註明出處，否則將追究法律責任。

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