oracle 表信息查询

1、用SQL语句查看Oracle表每条记录的创建时间

SELECT TO_CHAR(SCN_TO_TIMESTAMP(ORA_ROWSCN), 'yyyy-mm-dd hh24:mi:ss') INSERT_TIME FROM

表名;

 2、查看当前用户下的表

SELECT * FROM USER_TABLES；

3、查看数据库中所有的表
SELECT * FROM DBA_TABLES ；SELECT CREATED, LAST_DDL_TIME FROM USER_OBJECTS WHERE OBJECT_NAME = UPPER('表名')；
4、Oracle查看表空间的使用情况

SELECT SUM(BYTES) / (1024 * 1024) AS FREE_SPACE, TABLESPACE_NAME 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;

5、查看数据库库对象
SELECT OWNER, OBJECT_TYPE, STATUS, COUNT(*) COUNT#
FROM ALL_OBJECTS
GROUP BY OWNER, OBJECT_TYPE, STATUS;

6、查看数据库的版本　
SELECT VERSION FROM PRODUCT_COMPONENT_VERSION WHERE SUBSTR(PRODUCT, 1, 6) = 'Oracle';

7、查看数据库的创建日期和归档方式
SELECT CREATED, LOG_MODE, LOG_MODE FROM V$DATABASE;

8、查询数据库中索引占用表空间的大小
SELECT A.SEGMENT_NAME,A.TABLESPACE_NAME, B.TABLE_NAME, A.BYTES / 1024 / 1024 MBYTES, A.BLOCKS
FROM USER_SEGMENTS A, USER_INDEXES B
WHERE A.SEGMENT_NAME = B.INDEX_NAME
AND A.SEGMENT_TYPE = 'INDEX' --索引
AND A.TABLESPACE_NAME = 'APPINDEX' --表空间
AND B.TABLE_NAME LIKE '%PREP%' --索引所在表
ORDER BY TABLE_NAME, A.BYTES / 1024 / 1024 DESC