11、查詢oracle的連接數(shù) 2select count(*) from v$session; 32、查詢oracle的并發(fā)連接數(shù) 4select count(*) from v$session where status='ACTIVE'; 53、查看不同用戶的連接數(shù) 6select username,count(username) from v$session where username is not null group by username; 74、查看所有用戶： 8select * from all_users; 95、查看用戶或角色系統(tǒng)權(quán)限(直接賦值給用戶或角色的系統(tǒng)權(quán)限)： 10select * from dba_sys_privs; 11select * from user_sys_privs; 126、查看角色(只能查看登陸用戶擁有的角色)所包含的權(quán)限 13select * from role_sys_privs; 147、查看用戶對象權(quán)限： 15select * from dba_tab_privs; 16select * from all_tab_privs; 17select * from user_tab_privs; 188、查看所有角色： 19select * from dba_roles; 209、查看用戶或角色所擁有的角色： 21select * from dba_role_privs; 22select * from user_role_privs; 2310、查看哪些用戶有sysdba或sysoper系統(tǒng)權(quán)限(查詢時需要相應權(quán)限) 24select * from V$PWFILE_USERS;

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select count(*) from v$process --當前的連接數(shù)

select value from v$parameter where name = 'processes' --數(shù)據(jù)庫允許的最大連接數(shù)

修改最大連接數(shù): alter system set processes = 300 scope = spfile;

重啟數(shù)據(jù)庫: shutdown immediate; startup;

--查看當前有哪些用戶正在使用數(shù)據(jù) SELECT osuser, a.username,cpu_time/executions/1000000||'s', sql_fulltext,machine from v$session a, v$sqlarea b where a.sql_address =b.address order by cpu_time/executions desc; select count(*) from v$session #連接數(shù)

select count(*) from v$session where status='ACTIVE'　#并發(fā)連接數(shù)

show parameter processes #最大連接

alter system set processes = value scope = spfile;重啟數(shù)據(jù)庫 #修改連接

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SQL> Select count(*) from v$session where status='ACTIVE' ;
COUNT(*) ---------- 20
SQL> Select count(*) from v$session;
COUNT(*) ---------- 187
SQL> show parameter processes;
NAME TYPE VALUE ------------------------------------ ----------- ---------- aq_tm_processes integer 0 db_writer_processes integer 1 gcs_server_processes integer 0 job_queue_processes integer 10 log_archive_max_processes integer 2 processes integer 450 SQL>
并發(fā)指active,I SEE

SQL> select count(*) from v$session #連接數(shù) SQL> Select count(*) from v$session where status='ACTIVE'　#并發(fā)連接數(shù) SQL> show parameter processes #最大連接 SQL> alter system set processes = value scope = spfile;重啟數(shù)據(jù)庫 #修改連接
unix 1個用戶session 對應一個操作系統(tǒng) process 而 windows體現(xiàn)在線程

DBA要定時對數(shù)據(jù)庫的連接情況進行檢查，看與數(shù)據(jù)庫建立的會話數(shù)目是不是正常，如果建立了過多的連接，會消耗數(shù)據(jù)庫的資源。同時，對一些“掛死”的連接，可能會需要DBA手工進行清理。 以下的SQL語句列出當前數(shù)據(jù)庫建立的會話情況: select sid,serial#,username,program,machine,status from v$session; 輸出結(jié)果為: SID SERIAL# USERNAME PROGRAM MACHINE STATUS ---- ------- ---------- ----------- --------------- -------- 1 1 ORACLE.EXE WORK3 ACTIVE 2 1 ORACLE.EXE WORK3 ACTIVE 3 1 ORACLE.EXE WORK3 ACTIVE 4 1 ORACLE.EXE WORK3 ACTIVE 5 3 ORACLE.EXE WORK3 ACTIVE 6 1 ORACLE.EXE WORK3 ACTIVE 7 1 ORACLE.EXE WORK3 ACTIVE 8 27 SYS SQLPLUS.EXE WORKGROUP\\WORK3 ACTIVE 11 5 DBSNMP dbsnmp.exe WORKGROUP\\WORK3 INACTIVE 其中， SID 會話(session)的ID號; SERIAL# 會話的序列號，和SID一起用來唯一標識一個會話; USERNAME 建立該會話的用戶名; PROGRAM 這個會話是用什么工具連接到數(shù)據(jù)庫的; STATUS 當前這個會話的狀態(tài)，ACTIVE表示會話正在執(zhí)行某些任務，INACTIVE表示當前會話沒有執(zhí)行任何操作; 如果DBA要手工斷開某個會話，則執(zhí)行: alter system kill session \'SID,SERIAL#\'

sql語句 SQL語句如下：
SELECT username, machine, program, status, COUNT (machine) AS 連接數(shù)量 FROM v$session GROUP BY username, machine, program, status ORDER BY machine;
顯示結(jié)果（每個人的機器上會不同）
SCHNEIDER|WORKGROUD\WANGZHENG|TOAD.exe|ACTIVE|1 SCHNEIDER|WORKGROUP\597728AA514F49D|sqlplusw.exe|INACTIVE|1 |WWW-Q6ZMR2OIU9V|ORACLE.EXE|ACTIVE|8 PUBLIC|||INACTIVE|0 按主機名查詢 SELECT COUNT(*) FROM V$SESSION WHERE MACHINE = 'DXMH';????? 'DXMH'為主機名 數(shù)據(jù)恢復語句 create table informationlaw_bak as select * from informationlaw as of TIMESTAMP to_timestamp('20121126 103435','yyyymmdd hh24miss'); //按機器名分組查 select username,machine,count(username) from v$session where username is not null group by username,machine;

轉(zhuǎn)載于:https://www.cnblogs.com/pipijiqimao/archive/2013/05/13/3076019.html

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