一.正式环境操作注意事项: .关闭应用访问或者设置数据库只读 mysql设为只读方法: 开启只读: mysql> show global variables like "%read_only%"; #查看相关参数,OFF为关,ON为开,默认为OFF mysql> flush tables with read lock; mysql> ; 关闭只读: mysql> unlock tables; mysql> ; mysql> show global v
java classpath批量设置shell脚本 注意:linux bash jar文件之间的分隔符是':' export JAR_HOME=path to directory which includes jars for f in $JAR_HOME/*.jar do JAR_CLASSPATH=$JAR_CLASSPATH:$f done export JAR_CLASSPATH #the next line will print the JAR_CLASS
远程批量查询sql脚本 for i in {1..50} do sql_ip=172.168.0.${i} information=`mysql -h ${sql_ip} -uroot -ppassword dbname -e 'select name,value from setting where name = "name" UNION select name,value from setting where name = "code" ' |grep -v
Oracle 批量修改字段长度 SELECT 'alter table '||a.table_name||' MODIFY '||A.COLUMN_NAME||' VARCHAR2(100);' , A.table_name,A.COLUMN_NAME,A.DATA_TYPE,A.DATA_LENGTH,A.* from user_tab_columns A WHERE A.COLUMN_NAME='CREATE_USER' AND a.DATA_LENGTH<=20:
