SELECT * from user_views where view_name='v$session';

SELECT * FROM ALL_USERS where username like 'S%';

select * from v$database;

select username,profile from dba_users;;

select * from dba_profiles where profile='DEFAULT';

SELECT * from v$archive_dest;

select * from v$kccle;

select * from v$logfile;

select * from v$archive_dest;

select * from v$archive_dest_status;

select * from dba_tables T where owner='SYSTEM' AND TABLE_NAME LIKE 'FAM%';

analyze table family compute statistics for table--表分析;

select * from user_tables where table_name='FAMILY';

select * from v$parameter where name='db_block_size';

select segment_name,bytes from user_segments;

select count(*) from all_tables;

select count(*) from dba_tables;

select * from dba_tables where tablespace_name='SYSTEM' and table_name='FAMILY';

select segment_name,count(*),round(sum(bytes/1024/1024),9) MB from user_segments group by segment_name  order by MB desc;

select * from REPCAT$_DDL;

select * from user_segments wheRE segment_name='REPCAT$_DDL';

select count(*) from user_tables;

select * from DBA_tables WHERE TABLE_NAME='SYSTEM';


SELECT SUM(BYTES/1024/1024) FROM DBA_EXTENTS WHERE SEGMENT_NAME='FAMILY';

SELECT SUM(BYTES/1024/1024) FROM DBA_DATA_FILES WHERE TABLESPACE_NAME='SYSTEM';

SELECT SUM(BYTES/1024/1024) FROM DBA_FREE_SPACE WHERE TABLESPACE_NAME='SYSTEM';

SELECT SEGMENT_NAME,sum(bytes/1024/1024) from user_segments group by segment_name having segment_name='FAMILY';

SELECT SUM(BYTES/1024/1024) FROM DBA_EXTENTS WHERE SEGMENT_NAME='FAMILY';

SELECT SUM(BYTES/1024/1024) FROM USER_SEGMENTS WHERE SEGMENT_NAME='FAMILY';

SELECT 1-104.5625/810 FROM DUAL;

/*select   a.tablespace_name,a.bytes/1024/1024 "sum MB",(a.bytes-b.bytes)/1024/1024   "used MB",b.bytes/1024/1024 "free MB",round(((a.bytes-b.bytes)/a.bytes)*100,2) "percent_used"

from

(select tablespace_name,sum(bytes) bytes from dba_data_files group by tablespace_name)   a,

(select tablespace_name,sum(bytes) bytes,max(bytes) largest from dba_free_space group by tablespace_name)   b

where   a.tablespace_name=b.tablespace_name

order   by   ((a.bytes-b.bytes)/a.bytes)   desc

--表空间*/

select SUM(BYTES/1024/1024) from SYS.DBA_FREE_SPACE t WHERE TABLESPACE_NAME='SYSTEM';

SELECT TABLESPACE_NAME,SUM(BYTES/1024/1024) MB FROM DBA_DATA_FILES GROUP BY TABLESPACE_NAME;

SELECT SUM(BYTES/1024/1024) MB FROM DBA_DATA_FILES WHERE TABLESPACE_NAME='SYSTEM';

select * from SYS.DBA_FREE_SPACE t;

SELECT * FROM DBA_EXTENTS WHERE SEGMENT_NAME='FAMILY';

SELECT SUM(BYTES/1024/1024) MB FROM DBA_EXTENTS WHERE SEGMENT_NAME='FAMILY' ;--表的大小;

SELECT BYTES/1024/1024 FROM DBA_SEGMENTS WHERE SEGMENT_NAME='FAMILY';--表的大小

select * from v$parameter where name='db_block_size';--块的大小

select blocks*8/1024 from user_tables where table_name='FAMILY';--表的大小


select sql_text,first_load_time from v$sql order by first_load_time desc;

commit;

select * from family;

delete from family where name='zXq';

alter system switch logfile;--重做日志切换,切换后归档日志也会切换

select * from v$logfile; --重做日志

select * from v$archive_dest;--归档日志-

select *  from v$parameter where name='db_recovery_file_dest_size'; --归档日志总大小-

select * from v$parameter where name like '%retention_target';

select * from v$parameter where name='db_recovery_file_dest';


select * from v$flashback_database_log;

select flashback_on from v$database;--查看数据库闪回功能有没有打开

select * from v$version;--数据库版本

select * from v$parameter where name like '%retention_target';

select value/1024/1024/1024 AS "LOG/GB" from v$parameter where name='db_recovery_file_dest_size'--3.76171875;

select * from v$parameter where name='db_recovery_file_dest';

select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;;

select * from user_recyclebin;--回收站

select * from v$parameter where name='background_dump_dest';--警告文件和系统跟踪文件位置

select * from v$parameter where name='user_dump_dest';--用户跟踪文件位置