查询数据库表空间容量和数据量

 SELECT a.tablespace_name ,

 total,

 free,

 (total - free),

 total / (1024 * 1024 * 1024) "TS(G)",

 free / (1024 * 1024 * 1024) "TSfree(G)",

 (total - free) / (1024 * 1024 * 1024) "TSuse(G)",

 round((total - free) / total, 4) * 100 "BaiFenBi %"

 FROM (SELECT tablespace_name, SUM(bytes) free

  FROM dba_free_space

     GROUP BY tablespace_name) a,

             (SELECT tablespace_name, SUM(bytes) total

     FROM dba_data_files

       GROUP BY tablespace_name) b

 WHERE a.tablespace_name = b.tablespace_name

ASMCMD查询存储使用情况

ls -s

lsdg

du 

导出数据

create or replace directory data as '/home/oracle/imp'

Grant read,write on directory data to test1;

expdp test1/test1@pdborcl directory=data dumpfile=test1.dump logfile=test1.log schemas=test1

impdp test1/test1@pdborcl directory=data dumpfile=test1.dump logfile=test1.log tables=tab_t1

拼接sql语句

select 'select * from dba_tab_privs where grantee='|| username ||';' from dba_users;

select 'select * from dba_tab_privs where grantee='''||username||''';' from dba_users;

select 'insert into table_name values('''||field_1||''','''||field_2||''');'from table_name where field_n=some_conditon; 

查询非系统用户

select username from dba_users where username not in

('SYS'

,'SYSTEM'

,'OUTLN'

,'FLOWS_FILES'

,'MDSYS'

,'ORDSYS'

,'EXFSYS'

,'DBSNMP'

,'WMSYS'

,'APPQOSSYS'

,'APEX_030200'

,'ORDDATA'

,'CTXSYS'

,'ANONYMOUS'

,'XDB'

,'ORDPLUGINS'

,'SI_INFORMTN_SCHEMA'

,'OLAPSYS'

,'ORACLE_OCM'

,'XS$NULL'

,'MDDATA'

,'DIP'

,'APEX_PUBLIC_USER'

,'SPATIAL_CSW_ADMIN_USR'

,'SPATIAL_WFS_ADMIN_USR');

把某用户的对象授权给另一用户及撤销

select 'grant all on A1.'||table_name||' to B1;' from dba_tables where owner='A1';

select 'revoke all on A1.'||table_name||'  from B1;' from dba_tables where owner='A1';

alter user A1 default_tablespace='B1';