spool 本来是很好用的,但是在格式化数据上 ,不太熟悉set命令,于是网上找了下,在此备注下:SQLgt;set colsep
spool 本来是很好用的,但是在格式化数据上 ,不太熟悉set命令,于是网上找了下,在此备注下:
SQL>set colsep' '; //-域输出分隔符
SQL>set newp none //设置查询出来的数据分多少页显示,如果需要连续的数据,中间不要出现空行就把newp设置为none,这样输出的数据行都是连续的,中间没有空行之类的
SQL>set echo off; //显示start启动的脚本中的每个sql命令,,缺省为on
SQL> set echo on //设置运行命令是是否显示语句
SQL> set feedback on; //设置显示“已选择XX行”
SQL>set feedback off; //回显本次sql命令处理的记录条数,缺省为on即去掉最后的 "已经选择10000行"
SQL>set heading off; //输出域标题,缺省为on 设置为off就去掉了select结果的字段名,只显示数据
SQL>set pagesize 0; //输出每页行数,缺省为24,为了避免分页,可设定为0。
SQL>set linesize 80; //输出一行字符个数,缺省为80
SQL>set numwidth 12; //输出number类型域长度,缺省为10
SQL>set termout off; //显示脚本中的命令的执行结果,缺省为on
SQL>set trimout on;//去除标准输出每行的拖尾空格,缺省为off
SQL>set trimspool on;//去除重定向(spool)输出每行的拖尾空格,缺省为off
SQL>set serveroutput on; //设置允许显示输出类似dbms_output
SQL> set timing on; //设置显示“已用时间:XXXX”
SQL> set autotrace on-; //设置允许对执行的sql进行分析
set verify off //可以关闭和打开提示确认信息old 1和new 1的显示.
Oracle 导出数据到文件:
sqlplus /nolog @d:\sp.sql
d:\sp.sql内容如下:
set head off
set headsep off
set newp none
set linesize 100
set pagesize 10000
set sqlblanklines OFF
set trimspool ON
set termout off
set feedback off
spool d:\export.txt
select NODECODE||'&'||NODETYPE||'&'||NODENAME||'&' from "000".tbnode;
spool off
exit

方法:1、利用“select*from user_indexes where table_name=表名”语句查询表中索引;2、利用“select*from all_indexes where table_name=表名”语句查询所有索引。

oracle asm指的是“自动存储管理”,是一种卷管理器,可自动管理磁盘组并提供有效的数据冗余功能;它是做为单独的Oracle实例实施和部署。asm的优势:1、配置简单、可最大化推动数据库合并的存储资源利用;2、支持BIGFILE文件等。

在oracle中,可以利用“TO_SINGLE_BYTE(String)”将全角转换为半角;“TO_SINGLE_BYTE”函数可以将参数中所有多字节字符都替换为等价的单字节字符,只有当数据库字符集同时包含多字节和单字节字符的时候有效。

在Oracle中,可利用lsnrctl命令查询端口号,该命令是Oracle的监听命令;在启动、关闭或重启oracle监听器之前可使用该命令检查oracle监听器的状态,语法为“lsnrctl status”,结果PORT后的内容就是端口号。

在oracle中,可以利用“drop sequence sequence名”来删除sequence;sequence是自动增加数字序列的意思,也就是序列号,序列号自动增加不能重置,因此需要利用drop sequence语句来删除序列。

在oracle中,可以利用“select ... From all_tab_columns where table_name=upper('表名') AND owner=upper('数据库登录用户名');”语句查询数据库表的数据类型。

方法:1、利用“LOWER(字段值)”将字段转为小写,或者利用“UPPER(字段值)”将字段转为大写;2、利用“REGEXP_LIKE(字符串,正则表达式,'i')”,当参数设置为“i”时,说明进行匹配不区分大小写。

方法:1、利用“alter system set sessions=修改后的数值 scope=spfile”语句修改session参数;2、修改参数之后利用“shutdown immediate – startup”语句重启服务器即可生效。


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