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基于Solaris sparc的Oracle调优

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Jun 07, 2016 pm 04:40 PM

在Solaris 10 Update 10之后，以及Solaris 11，才可以设置进程的优先级。可以通过看/etc/release看其版本。如Oracle Solaris 10

一、RAC 中cluster wait time高问题

1.设置LMS进程为FX 60，不要过多调整lms进程的数量

注：在Solaris 10 Update 10之后，以及Solaris 11，才可以设置进程的优先级。可以通过看/etc/release看其版本。如Oracle Solaris 10 1/13 是表示Solaris 10 Update 11，可参考：Oracle Solaris 10 Update版本及其历史

Oracle Solaris 10 1/06 (Update 1) U1
Oracle Solaris 10 6/06 (Update 2) U2
Oracle Solaris 10 11/06 (Update 3) U3
Oracle Solaris 10 8/07 (Update 4) U4
Oracle Solaris 10 5/08 (Update 5) U5
Oracle Solaris 10 10/08 (Update 6) U6
Oracle Solaris 10 5/09 (Update 7) U7
Oracle Solaris 10 10/09 (Update 8) U8
Oracle Solaris 10 9/10 (Update 9) U9
Oracle Solaris 10 8/11 (Update 10) U10
Oracle Solaris 10 1/13 (Update 11) U11

2. UDP的参数：

In /etc/system
set ip:ip_squeue_bind = 0

二、在大型系统中，startup启动慢，加载sga慢。

1.为了加速sga内存加载，可以加大并发加载内存的模式：（注：默认为最大16个并发，下面的改成了32个并发），修改/etc/system中的参数：

set vmtask_ntasks_max = 0x20

2.或者直接在线修改：

echo “vmtask_ntasks_max /W 0x20” | /bin/mdb -kw

在测试环境中，在T3-4的机器上，加载450G的SGA，如果默认16个并发，需要60秒，，如果用64个并发，只需要20秒左右。

三、log file sync问题

log file sync等待较多，但是log file parallel write等待时间不多。

可以用prstat -p -v 检查lgwr的cpu使用情况，如%sys的比例，如LAT的latency。

1. 降低每个信号量的process数：

2.提高lgwr的进程优先级到FX 60

# priocntl –c FX -m 60 -p 60 -s `/usr/bin/pgrep -f ora_lgwr`

3. 给lgwr以独占的方式使用cpu

# #Create Processor Set
# psrset –c 56-63
# #Turn off all but one CPU in the processor set
# psradm –f 57-63
# #Bind the lgwr to the processor set
# psrset –b 1 `pgrep –f ora_lgwr`
# #Mark the CPU as non-interruptible
# psrset –f 56

四、db file sequential/parallel read等待过高的问题。

参考：CON1741_Mcintosh-Top 10 Database Performance Tips for SPARC Systems Running Oracle Solaris.pptx

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