select * from tabs --当前用户下的所有表 select * from dual --伪表 select * from (select * from fduser order by dbms_random.value) where rownum=1; -- 随机查询一条数据
ALTER USER TMFC ACCOUNT UNLOCK -- 解锁用户 , 当用户密码验证失败连续十次之后 账户会被锁定
alter system set sec_case_sensitive_logon=false -- 设置oracle不区分大小写
--查看表空间的名字和所属文件 select tablespace_name, file_id, file_name, round(bytes/(1024*1024),0) total_space from dba_data_files order by tablespace_name;
--查看表空间 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;
ALTER TABLESPACE TMFC_TBS ADD DATAFILE ‘D:\oradata\mesdb\TMFC_29.DBF‘ SIZE 4000M -- 增加表的数据文件 扩展表空间
oracle经常会用到的SQL
时间: 2024-11-05 19:28:33