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_space

FROM

dba_free_space

GROUP 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 c

WHERE

a.tablespace_name = b.tablespace_name

AND 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_FILES

WHERE

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_space

FROM

dba_segments

WHERE

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_space

FROM

dba_segments

WHERE

segment_name IN (SELECT table_name FROM user_tables)

GROUP BY

SEGMENT_NAME

ORDER 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)

Oracle表和表空间查询

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