获得所有表信息的SQL语句

exec sp_MSForEachTable
@precommand=N'
create table ##(
id int identity,
表名 sysname,
字段数 int,
记录数 int,
保留空间 Nvarchar(10),
使用空间 varchar(10),
索引使用空间 varchar(10),
未用空间 varchar(10))',
@command1=N'insert ##(表名,记录数,保留空间,使用空间,索引使用空间,未用空间) exec sp_spaceused ''?''
update ## set 字段数=(select count(*) from syscolumns where id=object_id(''?'')) where id=scope_identity()',
@postcommand=N'select * from ## order by id drop table ##'

从Oracle10g开始，Oracle极大的增强了OEM工具，并通过服务器端进行EM工具全面展现。
在10g中，客户端可以不必安装任何Oracle客户端工具，仅凭浏览器就可以调用强大的EM工具。
在Server端，可以通过如下命令启动EM工具控制台:
emctl start dbconsole
以下是启动过程:
[oracle@danaly ~]$ emctl start dbconsole
TZ set to PRC
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
http://danaly.hurrray.com.cn:1158/em/console/aboutApplication
Starting Oracle Enterprise Manager 10g Database Control .......................... started.
------------------------------------------------------------------
Logs are generated in directory /opt/oracle/product/10.2.0/danaly.hurrray.com.cn_danaly/sysman/log

启动之后我们就可以通过在浏览器端输入以下url访问:
http://danaly.hurrray.com.cn:1158/em/
同样停止OEM可以输入如下命令:
emctl stop dbconsole

以下是停止过程:
[oracle@danaly ~]$ emctl stop dbconsole
TZ set to PRC
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
http://danaly.hurrray.com.cn:1158/em/console/aboutApplication
Stopping Oracle Enterprise Manager 10g Database Control ...... Stopped.

也可以直接键入emctl查看emctl支持的选项:
[oracle@danaly ~]$ emctl
TZ set to PRC
Oracle Enterprise Manager 10g Database Control Release 10.2.0.1.0
Copyright (c) 1996, 2005 Oracle Corporation. All rights reserved.
Invalid arguments
Unknown command option
Usage::
Oracle Enterprise Manager 10g Database Control commands:
emctl start| stop| status| setpasswd dbconsole
1.按姓氏笔画排序:
Select * From TableName Order By CustomerName Collate Chinese_PRC_Stroke_ci_as
2.数据库加密:
select encrypt('原始密码')
select pwdencrypt('原始密码')
select pwdcompare('原始密码','加密后密码') = 1--相同；否则不相同 encrypt('原始密码')
select pwdencrypt('原始密码')
select pwdcompare('原始密码','加密后密码') = 1--相同；否则不相同
3.取回表中字段:
declare @list varchar(1000),@sql nvarchar(1000)
select @list=@list ',' b.name from sysobjects a,syscolumns b where a.id=b.id and a.name='表A'
set @sql='select ' right(@list,len(@list)-1) ' from 表A'
exec (@sql)
4.查看硬盘分区:
EXEC master..xp_fixeddrives
5.比较A,B表是否相等:
if (select checksum_agg(binary_checksum(*)) from A)
=
(select checksum_agg(binary_checksum(*)) from B)
print '相等'
else
print '不相等'
6.杀掉所有的事件探察器进程:
DECLARE hcforeach CURSOR GLOBAL FOR SELECT 'kill ' RTRIM(spid) FROM master.dbo.sysprocesses
WHERE program_name IN('SQL profiler',N'SQL 事件探查器')
EXEC sp_msforeach_worker '?'
'www.111cn.net
7.记录搜索:
开头到N条记录
Select Top N * From 表
-------------------------------
N到M条记录(要有主索引ID)
Select Top M-N * From 表 Where ID in (Select Top M ID From 表) Order by ID Desc
----------------------------------
N到结尾记录
Select Top N * From 表 Order by ID Desc
8.如何修改数据库的名称:
sp_renamedb 'old_name', 'new_name'
9：获取当前数据库中的所有用户表
select Name from sysobjects where xtype='u' and status>=0
10：获取某一个表的所有字段
select name from syscolumns where id=object_id('表名')
11：查看与某一个表相关的视图、存储过程、函数
select a.* from sysobjects a, syscomments b where a.id = b.id and b.text like '%表名%'
12：查看当前数据库中所有存储过程
select name as 存储过程名称 from sysobjects where xtype='P'
13：查询用户创建的所有数据库
1.Dynamic SQL Format 1
EXECUTE IMMEDIATE SQLStatement {USING TransactionObject} ;
eg:
string Mysql
Mysql = "CREATE TABLE Employee "&
"(emp_id integer not null,"&
"dept_id integer not null, "&
"emp_fname char(10) not null, "&
"emp_lname char(20) not null)"
EXECUTE IMMEDIATE :Mysql ;
2.Dynamic SQL Format 2
PREPARE DynamicStagingArea FROM SQLStatement {USING TransactionObject} ;
EXECUTE DynamicStagingArea USING {ParameterList} ;
eg:
INT Emp_id_var = 56
PREPARE SQLSA
FROM "DELETE FROM employee WHERE emp_id=?" ;
EXECUTE SQLSA USING :Emp_id_var ;
3.Dynamic SQL Format 3
DECLARE Cursor | Procedure DYNAMIC CURSOR | PROCEDURE FOR DynamicStagingArea ;
PREPARE DynamicStagingArea FROM SQLStatement {USING TransactionObject} ;
OPEN DYNAMIC Cursor {USING ParameterList} ;
EXECUTE DYNAMIC Procedure {USING ParameterList} ;
FETCH Cursor | Procedure INTO HostVariableList ;
CLOSE Cursor | Procedure ;
eg:
integer Emp_id_var
DECLARE my_cursor DYNAMIC CURSOR FOR SQLSA ;
PREPARE SQLSA FROM "SELECT emp_id FROM employee" ;
OPEN DYNAMIC my_cursor ;
FETCH my_cursor INTO :Emp_id_var ;
CLOSE my_cursor ;
4.Dynamic SQL Format 4
DECLARE Cursor | Procedure DYNAMIC CURSOR | PROCEDURE FOR DynamicStagingArea ;
PREPARE DynamicStagingArea FROM SQLStatement {USING TransactionObject} ;
DESCRIBE DynamicStagingArea INTO DynamicDescriptionArea ;
OPEN DYNAMIC Cursor | Procedure USING DESCRIPTOR DynamicDescriptionArea ;
EXECUTE DYNAMIC Cursor | Procedure USING DESCRIPTOR DynamicDescriptionArea ;
FETCH Cursor | Procedure USING DESCRIPTOR DynamicDescriptionArea ;
CLOSE Cursor | Procedure ;
eg:
string Stringvar, Sqlstatement
integer Intvar
很多时候由于异常或程序错误会导致个别进程占用大量系统资源，需要结束这些进程，通常可以使用以下命令Kill进程:
alter system kill session 'sid,serial#';

但是此命令释放资源极为缓慢，具体可以参考:Oracle中Kill session的研究.
为了更快速的释放资源，通常我们使用如下步骤来Kill进程:
1.首先在操作系统级kill进程
2.在数据库内部kill session
这样通常可以快速中止进程，释放资源。
今天就遇到这样一个案例，其他朋友在数据库里kill session,可是长时间仍无效果:
[oracle@danaly ~]$ sqlplus "/ as sysdba"
SQL*Plus: Release 10.2.0.1.0 - Production on Thu Oct 27 11:09:50 2005
Copyright (c) 1982, 2005, Oracle. All rights reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, Oracle Label Security, OLAP and Data Mining Scoring Engine options
SQL> select sid,username,status from v$session;
SID USERNAME STATUS
---------- ------------------------------ --------
....
154 SCOTT KILLED
...
30 rows selected.

那按照我前面提到的步骤，首先查询得到该session对应的OS进程号:
SQL> select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=&sid);
Enter value for sid: 154
old 1: select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=&sid)
new 1: select 'kill -9 '||spid from v$process where addr = (select paddr from v$session where sid=154)
'KILL-9'||SPID
--------------------
kill -9 22702
SQL> !

在操作系统级kill该进程:
[oracle@danaly ~]$ ps -ef|grep 22702
oracle 22702 1 0 Oct25 ? 00:00:02 oracledanaly (LOCAL=NO)
oracle 12082 12063 0 11:12 pts/1 00:00:00 grep 22702
[oracle@danaly ~]$ kill -9 22702
[oracle@danaly ~]$ ps -ef|grep 22702
oracle 12088 12063 0 11:12 pts/1 00:00:00 grep 22702
[oracle@danaly ~]$ exit