ORACLE 数据库自动备份脚本
#! /bin/bash
if [ -f ~/.bashrc ];then
. ~/.bash_profile
fi
export script=/home/oracle/script
export bakdata_destination=/u02/rman_backup/data
export baklog_destination=/u02/rman_backup/log
export datadir=`date +'%Y_%m_%d'`
export days=`date +'%w'`
if ! test -d $script
then
mkdir -p $script
fi
if ! test -d $bakdata_destination
then
mkdir -p $bakdata_destination
fi
if ! test -d $baklog_destination
then
mkdir -p $baklog_destination
fi
if [ $days -eq 1 ];then
#create the directory for datafile
if ! test -e $baklog_destination/failedlog.txt
then
touch $baklog_destination/failedlog.txt
fi
if [ $? = 0 ];then
echo "you is the frist create the failed file"
fi
if ! test -e $baklog_destination/successful.txt
then
touch $baklog_destination/successful.txt
fi
if [ $? = 0 ] ; then
echo "you is the frist creat the successful file"
fi
if ! test -d $bakdata_destination/$datadir
then
mkdir $bakdata_destination/$datadir
fi
if [ $? -eq 1 ]; then
echo "Error :Cann't create the directory,please check the reason! ">>$baklog_destination/failedlog.txt
fi
echo run { >$script/rman_level0.rman
echo "backup incremental level 0 database filesperset = 7 format '"$bakdata_destination/$datadir/bak0_`date '+%Y_%m_%d_%H_%M_%S'`.bak"';" >>$script/rman_level0.rman
echo "sql \"ALTER SYSTEM ARCHIVE LOG CURRENT\"; ">>$script/rman_level0.rman
echo backup archivelog all delete input >>$script/rman_level0.rmanecho "format '"$bakdata_destination/$datadir/arc0_`date '+%Y_%m_%d_%H_%M_%S'`.bak"';" >>$script/rman_level0.rman
echo } &
相关文档：
第一种：
select * from SOME_TABLE sample(1) where rownum <= 10;
第二种：
select * from (select * from SOME_TABLE order by dbms_random.value) where rownum<=10;
第三种：
select * from (select * from SOME_TABLE order by sys_guid()) where rownum <= 10; ......
Oracle互换总结
1. 多行换成一行
col1 col2 col1 col2
a 1
a 2 转换后 ......
函数索引的概念：
基于函数的索引也是8i以来的新产物，它有索引计算列的能力，它易于使用并且提供计算好的值，在不修改应用程序的逻辑上提高了查询性能。使用基于函数的索引有几个先决条件：
(1)
必须拥有QUERY REWRITE（本模式下）或GLOBAL QUERY REWRITE（其他模式下）权限。
(2)
必须使用基于成本的优化器，基于规� ......
对每一行输入值进行计算，得到相应的计算结果，返回给用户，也就是说，每行作为一个输入参数，经过函数计算得到每行的计算结果是单行函数。
一、字符函数
1、字符串大小写转换
(1)LOWER (strexp) 返回字符串,并将所有的字符小写
(2)UPPER (strexp) 返回字符串,并将所有的� ......
