用户查询

查询和用户相关的数据
创建用户

CREATE USER user IDENTIFIED BY password [DEFAULT TABLESPACE tablespace] [TEMPORARY TABLESPACE tablespace]

查询所有用户数

select username from dba_users;

查询当前实例名称

select instance_name from v$instance;

表空间查询

查询用户表空间和临时表空间相关的数据

用户表空间

创建表空间

CREATE TABLESPACE tbs_01 DATAFILE ‘demo.dbf‘ SIZE 40M AUTOEXTEND ON NEXT 5M MAXSIZE 100M ONLINE LOGGING EXTENT MANAGEMENT LOCAL UNIFORM SIZE 2M SEGMENT SPACE MANAGEMENT AUTO;

查询表空间总大小

SELECT TABLESPACE_NAME, FILE_ID, FILE_NAME, BYTES/1024/1024 AS "BYTES(M)" FROM DBA_DATA_FILES

查询表空间剩余大小

SELECT tablespace_name, SUM(bytes) / (1024 * 1024) AS free_spaceFROM dba_free_spaceGROUP BY tablespace_name;SELECT a.tablespace_name, a.bytes total, b.bytes used, c.bytes free, (b.bytes * 100) / a.bytes "% USED ", (c.bytes * 100) / a.bytes "% FREE "FROM sys.sm$ts_avail a, sys.sm$ts_used b, sys.sm$ts_free cWHERE a.tablespace_name = b.tablespace_nameAND a.tablespace_name = c.tablespace_name; 

临时表空间

查询临时表空间大小

SELECT TABLESPACE_NAME, FILE_ID, FILE_NAME, BYTES/1024/1024 AS "SPACE(M)"FROM DBA_TEMP_FILESWHERE TABLESPACE_NAME = ‘TEMP‘;

创建临时表空间

create temporary tablespace temp1 tempfile ‘/u01/app/oracle/oradata/orcl/temp11.dbf‘ size 10M;

缩小临时表空间大小

alter database datapfile ‘D:\ORACLE\PRODUCT\10.2.0\ORADATA\TELEMT\TEMP01.DBF‘ resize 100M;

扩展临时表空间：

• 增大临时文件大小：

alter database tempfile ‘/u01/app/oracle/oradata/orcl/temp01.dbf‘ resize 100m;

• 将临时数据文件设为自动扩展：

alter database tempfile ‘/u01/app/oracle/oradata/orcl/temp01.dbf‘ autoextend on next 5m maxsize unlimited;

• 向临时表空间中添加数据文件：

alter tablespace temp add tempfile ‘/u01/app/oracle/oradata/orcl/temp02.dbf‘ size 100m;

表查询

查询当前登录用户下所有表名称

select table_name from user_tables;

查询某个表的大小，替换为你的TABLE_NAME

SELECT SEGMENT_NAME, round(SUM(BYTES/1024/1024),2)||‘M‘ memory_spaceFROM dba_segmentsWHERE segment_name=‘TABLE_NAME‘group by SEGMENT_NAME

查询当前登录用户所有表的大小

SELECT SEGMENT_NAME, ROUND(SUM(BYTES/1024/1024),2)||‘M‘ memory_spaceFROM dba_segmentsWHERE segment_name IN (SELECT table_name FROM user_tables)GROUP BY SEGMENT_NAMEORDER BY memory_space desc;

查询当前用户下的分区表

select table_name from user_tables where partitioned=‘YES‘

查询某个表的分区数

SELECT table_name,partition_name from user_tab_partitions where table_name = ‘TABLE_NAME‘

查询某个分区的数据

SELECT * FROM MODULEEVALUATIONHISTORY_PART PARTITION(SYS_P43)