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常用查看表结构命令
elect table_name from user_tables; --当前用户的表
select table_name from all_tables; --所有用户的表
select table_name from dba_tables; --包括系统表
select table_name from dba_tables where owner=‘用户名‘
user_tables:
table_name,tablespace_name,last_analyzed等
dba_tables:
ower,table_name,tablespace_name,last_analyzed等
all_tables:
ower,table_name,tablespace_name,last_analyzed等
all_objects:
ower,object_name,subobject_name,object_id,created,last_ddl_time,timestamp,status等
获取表字段:
select * from user_tab_columns where Table_Name=‘用户表‘;
select * from all_tab_columns where Table_Name=‘用户表‘;
select * from dba_tab_columns where Table_Name=‘用户表‘;
user_tab_columns:
table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,
column_id等
all_tab_columns :
ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,
column_id等
dba_tab_columns:
ower,table_name,column_name,data_type,data_length,data_precision,data_scale,nullable,
column_id等
获取表注释:
select * from user_tab_comments
user_tab_comments:table_name,table_type,comments
--相应的还有dba_tab_comments,all_tab_comments,这两个比user_tab_comments
多了ower列。
获取字段注释:
select * from user_col_comments
user_col_comments:table_name,column_name,comments
查询表空间容量大小,为表空间添加dbf文件
Select
file_id,
file_name,
tablespace_name,
autoextensible,increment_by,
bytes/1024/1024 "bytes MB",
maxbytes/1024/1024 "maxbytes MB" ,
bytes/maxbytes
from dba_data_files
order by file_id desc;
alter tablespace 表空间
add datafile ‘dbf文件物理路径‘ size 20m reuse
autoextend on
next 5M
select * from sys.props$ where name =‘NLS_CHARACTERSET‘;
查询字符集
SELECT object_name, s.sid, s.serial#, p.spid
FROM v$locked_object l, dba_objects o, v$session s, v$process p
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
AND s.paddr = p.addr;
查询死锁
alter system kill session ‘sid,serial#‘;
杀掉进程
select * from v$version
查找数据库信息
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原文地址:http://www.cnblogs.com/cn-rwy/p/4570681.html