通过Shell脚本得到数据库的基本信息
今天写了个Shell脚本，虽然实现的功能不多，但是个人感觉是一个好的开始，架子出来了，后面要补充的细节加进来就逐步完善了。
这个脚本的运行效果如下：
OS Version is :[ RHEL_6.3 ]
Oracle Version is :[ 11.2.0.3.0]
Oracle Instance is :[ dgtest ]
dgtest
ORACLE_HOME is :[ /U01/app/oracle/product/11.2.0.2/db_1 ]
Oracle status is :[ 11g PRIMARY ]
Oracle SPFILE is :[ ENABLED ]
Oralce DGBroker is :[ DISABLED ]
FORCE LOGGING is :[ DISABLED ]
HugePage Status is :[ DISABLED ]
这个脚本会对大部分的信息进行一个概览，我想在这些内容的基础上添加更多的经验所得。
运行这个脚本，好与不好一目了然，当然现在的功能还是有距离，慢慢改进吧。
值得说道的是“Oracle status”的地方，会判断主备库，区分了10g,11g的不同特点。
当然后面的大篇幅脚本是关于HugePage的，这个地方想补充出建议的值来，所以暂且这样。
脚本内容如下：
. /home/oracle/.bash_profile
# Get OS Version
echo 'OS Version is :[' `cat /etc/issue|sed -e 's/Red Hat Enterprise Linux Server release/RHEL/g' -e 's/Red Hat Enterprise Linux AS release/RHEL/g' -e 's/ /_/g' -e 's/_(Tikanga)//g' -e 's/_(Santiago)//g' -e 's/_release//g' -e 's/_(Final)//g' -e 's/Nahant_Update_//g'|head -1` ]
# Get Oracle Version
echo 'Oracle Version is :[ '`sqlplus -v|sed '/^$/d'|awk '{print $3}'`]
# Get Oracle Instance List
echo 'Oracle Instance is :[ '`ps -ef|grep smon|grep -v grep|awk '{gsub("ora_smon_","",$8)}{print $8}'|grep -v awk` ]
for tmp_db in `ps -ef|grep smon|grep -v grep|awk '{gsub("ora_smon_","",$8)}{print $8}'|grep -v awk`
do
echo $tmp_db
#Get Oracle Home
echo 'ORACLE_HOME is :[' $ORACLE_HOME ' ]'
# Get database role
su -l oracle <<EOS
export ORACLE_SID=${tmp_db}
$ORACLE_HOME/bin/sqlplus -s / as sysdba <<EOF
set pages 0
set feedback off
select 'Oracle status is :[ '||decode(substr(version,1,2),11,
(select decode(database_role,'PHYSICAL STANDBY',(decode(open_mode,'READ ONLY WITH APPLY','11g ADG','11g DG NEED_CHECK')),'PRIMARY','11g PRIMARY') from v\\\$database),
10,
(select decode(database_role,'PHYSICAL STANDBY',(decode(open_mode,'MOUNTED','10g DG NORMAL','10g DG NEED_CHECK')),'PRIMARY','10g PRIMARY') from v\\\$database)
)||' ]' DG_MODE
from v\\\$instance;
select decode(value,null,'Oralce SPFILE is :[ DISABLED ]','Oracle SPFILE is :[ ENABLED ]') from v\\\$parameter where name='spfile';
select decode(upper(value),'FALSE','Oralce DGBroker is :[ DISABLED ]','Oracle DGBroker is :[ ENABLED ]') from v\\\$parameter where name='dg_broker_start';
select decode(force_logging,'NO','FORCE LOGGING is :[ DISABLED ]','FORCE LOGGING is :[ ENABLED ]') from v\\\$database;
EOF
EOS
done
# Check HugePage enabled
# Check for the kernel version
KERN=`uname -r | awk -F. '{ printf("%d.%d\n",$1,$2); }'`
# Find out the HugePage size
HPG_SZ=`grep Hugepagesize /proc/meminfo | awk {'print $2'}`
# Start from 1 pages to be on the safe side and guarantee 1 free HugePage
NUM_PG=1
# Cumulative number of pages required to handle the running shared memory segments
for SEG_BYTES in `ipcs -m | awk {'print $5'} | grep "[0-9][0-9]*"`
do
MIN_PG=`echo "$SEG_BYTES/($HPG_SZ*1024)" | bc -q`
if [ $MIN_PG -gt 0 ]; then
NUM_PG=`echo "$NUM_PG+$MIN_PG+1" | bc -q`
fi
done
case $KERN in
'2.4') HUGETLB_POOL=`echo "$NUM_PG*$HPG_SZ/1024" | bc -q`;
grep vm.hugetlb_pool /etc/sysctl.conf|awk '{print $0==""?"HugePage Status :[ DISABLED ]":"HugePage Status is :[ ENABLED ]"}';;
'2.6') grep vm.nr_hugepages /etc/sysctl.conf|xargs echo $1|awk '{print $0==""?"HugePage Status is :[ DISABLED ]":"HugePage Status is :[ ENABLED ]"}';;
*) echo "Unrecognized kernel version $KERN. Exiting." ;;
esac