Oracle_相关操作汇总

迈不过友情╰ 2021-10-06 03:10 375阅读 0赞

### Oracle\_相关操作汇总 ###

*  锁表
 *  创建库
 *  常用查询

# 锁表 #

--查询行锁
    select sql_text from v$sql a,v$session b
    where a.sql_id=b.sql_id and b.event='enq: TX - row lock contention';
        
    --查询表锁
    SELECT object_name, machine, s.sid, s.serial#
    FROM gv$locked_object l, dba_objects o, gv$session s
    WHERE l.object_id = o.object_id
    AND l.session_id = s.sid;
    
    --查询当前执行的sql
    SELECT b.sid oracleID,
    b.username 登录Oracle用户名,
    b.serial#,
    spid 操作系统ID,
    paddr,
    sql_text 正在执行的SQL,
    b.machine 计算机名
    FROM v$process a, v$session b, v$sqlarea c
    WHERE a.addr = b.paddr
    AND b.sql_hash_value = c.hash_value    
    
    --查询锁表
    SELECT l.session_id sid,
    s.serial#,
    l.locked_mode 锁模式,
    l.oracle_username 登录用户,
    l.os_user_name 登录机器用户名,
    s.machine 机器名,
    s.terminal 终端用户名,
    s.logon_time 登录数据库时间，
    o.object_name 被锁对象名
    FROM v$locked_object l, all_objects o, v$session s
    WHERE l.object_id = o.object_id
    AND l.session_id = s.sid
    ORDER BY sid, s.serial#;
     
    --解锁
    ALTER SYSTEM KILL SESSION '66,888';

# 创建库 #

--创建临时表空间
    create temporary tablespace wip_portal_temp
    tempfile '/home/oracle/data/wip_portal_temp.dbf' 
    size 50m 
    autoextend on 
    next 50m maxsize 20480m 
    extent management local; 
    
    --创建数据表空间
    create tablespace wip_portal
    logging 
    datafile '/home/oracle/data/wip_portal.dbf' 
    size 50m 
    autoextend on 
    next 50m maxsize 20480m 
    extent management local; 
    
    --创建用户并指定表空间 
    create user portal identified by portal
    default tablespace wip_portal
    temporary tablespace wip_portal_temp; 
    
    --给用户授予权限 
    grant connect,resource,dba to portal ; 
    
    
    --授权目录sso为用户oracle：chown -R oracle ./home/oracle/data
    --设置目录sso的读取权限：chmod -R 777 sso

# 常用查询 #

-- 查询指定表的所有字段名和字段说明
    select t.column_name, t.comments from user_col_comments t where t.table_name = 'BIZ_DICT_XB';
    --  查询指定表记录数
    select a.num_rows, a.TABLE_NAME, b.COMMENTS from user_tables a, user_tab_comments b WHERE a.TABLE_NAME = b.TABLE_NAME and a.TABLE_NAME = 'TB_USER' order by TABLE_NAME;
    
    -- 当前数据库连接数
    select count(*) from v$session where username is not null;
    select count(*) from v$process;
    
    -- 数据库最大连接数
    select value from v$parameter where name ='processes';