Oracle命令

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所属分类:Database Oracle
1.查看不同用户连接数:
select username,count(username) from v$session where username is not null group by username;
2.查看连接数
select count(*) from v$session;
3.查看并发连接数
select count(*) from v$session where status='ACTIVE';
4.查看所有表空间情况
SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
D.TOT_GROOTTE_MB "表空间大小(M)",
D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,2),'990.99') "使用比",
F.TOTAL_BYTES "空闲空间(M)",
F.MAX_BYTES "最大块(M)"
FROM (SELECT TABLESPACE_NAME,
ROUND(SUM(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,
ROUND(MAX(BYTES) / (1024 * 1024), 2) MAX_BYTES
FROM SYS.DBA_FREE_SPACE
GROUP BY TABLESPACE_NAME) F,
(SELECT DD.TABLESPACE_NAME,
ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB
FROM SYS.DBA_DATA_FILES DD
GROUP BY DD.TABLESPACE_NAME) D
WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
ORDER BY 4 DESC;
5.为SYSTEM表空间增加一个数据文件SYSTEM02.dbf
ALTER TABLESPACE "SYSTEM" ADD DATAFILE '/u01/oradata/orcl/SYSTEM02.dbf' SIZE 500M AUTOEXTEND ON NEXT 50M MAXSIZE UNLIMITED;

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