#!/bin/sh

##设置sqlplus查询输出模式，不输出冗余内容
echo "set heading off" > test.sql
echo "set echo off" >> test.sql
echo "set flush off" >> test.sql
echo "set feedback off" >> test.sql
echo "set pagesize 9999" >> test.sql
echo "set linesize 9999" >> test.sql
echo "set long 9999" >> test.sql
##查询所有表名称和所属用户
echo "select OWNER,TABLE_NAME from all_tab_comments;" >> test.sql
echo "quit;" >> test.sql

##执行并保存结果到文件中
sqlplus sys/123456 as sysdba @test.sql > test.result

##删除前11行
sed -i '1,11d' test.result
##删除倒数2行
sed -i '$d' test.result
sed -i '$d' test.result
##删除空行
sed -i '/^$/d' test.result
##过滤系统用户行
cat test.result | awk '{if( \
 !($1~/SYS/) &&\
 !($1=="ORDDATA") &&\
 !($1~/APEX/) &&\
 !($1=="XDB") &&\
 !($1=="OUTLN") &&\
 !($1=="DBSNMP") &&\
 !($1=="  B") &&\
 !($1=="FLOWS_FILES") &&\
 !($1=="SCOTT") ){print $1"."$2}}' > test.new


##依据过滤后的结果，查询表格最后修改时间
echo > last_time.txt
while read line 
do
    echo > test.result
    ##设置sqlplus查询输出模式，不输出冗余内容
    echo "set heading off" > test.sql
    echo "set echo off" >> test.sql
    echo "set flush off" >> test.sql
    echo "set feedback off" >> test.sql
    echo "set pagesize 9999" >> test.sql
    echo "set linesize 9999" >> test.sql
    echo "set long 9999" >> test.sql
    echo "select max(ora_rowscn),to_char(scn_to_timestamp(max(ora_rowscn)),'yyyy-mm-dd hh24:mi:ss') from "$line";" >> test.sql
    echo "quit;" >> test.sql
    #cat test.sql;
    sqlplus sys/123456 as sysdba @test.sql >> test.result
    ##删除前11行
    sed -i '1,11d' test.result
    ##删除倒数2行
    sed -i '$d' test.result
    sed -i '$d' test.result
    ##删除空行
    sed -i '/^$/d' test.result

    ##跳过空表
    if [[ $(grep -nw 'NULL' test.result | grep -v grep | wc -l) -eq 1 ]]; then
        continue;
    fi

    ##保存到文件
    cat test.result >> last_time.txt
done < test.new
sed -i '/^$/d'  last_time.txt
cat last_time.txt

##比较scn号，获取最新时间
echo '--------------------------------------------------'
cat last_time.txt | awk 'NR==1{max=$1;last_date=$2;last_time=$3;next}{if(max<$1){max=$1; last_date=$2 ; last_time=$3}}END{print max" "last_date" "last_time}'

执行过程耗时较长，此环境为单机环境没有多少数据，耗时3秒，若是生产环境rac集群数据量较大的环境，时间将更长不少。