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oracle 相關的sql語句

数据字典dict总是属于Oracle用户sys的。
  1、用户:
   select username from dba_users;
  改口令
   alter user spgroup identified by spgtest;
  2、表空间:
   select * from dba_data_files;
   select * from dba_tablespaces;//表空间
   select tablespace_name,sum(bytes), sum(blocks)
    from dba_free_space group by tablespace_name;//空闲表空间
   select * from dba_data_files
    where tablespace_name='RBS';//表空间对应的数据文件
   select * from dba_segments
    where tablespace_name='INDEXS';
  3、数据库对象:
   select * from dba_objects;
   CLUSTER、DATABASE LINK、FUNCTION、INDEX、LIBRARY、PACKAGE、PACKAGE BODY、
   PROCEDURE、SEQUENCE、SYNONYM、TABLE、TRIGGER、TYPE、UNDEFINED、VIEW。
  4、表:
   select * from dba_tables;
   analyze my_table compute statistics;->dba_tables后6列
   select extent_id,bytes from dba_extents
   where segment_name='CUSTOMERS' and segment_type='TABLE'
   order by extent_id;//表使用的extent的信息。segment_type='ROLLBACK'查看回滚段的空间分配信息
   列信息:
    select distinct table_name
    from user_tab_columns
    where column_name='SO_TYPE_ID';
  5、索引: 
   select * from dba_indexes;//索引,包括主键索引
   select * from dba_ind_columns;//索引列
   select i.index_name,i.uniqueness,c.column_name
    from user_indexes i,user_ind_columns c
     where i.index_name=c.index_name
     and i.table_name ='ACC_NBR';//联接使用
  6、序列:
   select * from dba_sequences;
  7、视图:
   select * from dba_views;
   select * from all_views;
  text 可用于查询视图生成的脚本
  8、聚簇:
   select * from dba_clusters;
  9、快照:
   select * from dba_snapshots;
  快照、分区应存在相应的表空间。
  10、同义词:
   select * from dba_synonyms
    where table_owner='SPGROUP';
    //if owner is PUBLIC,then the synonyms is a public synonym.
     if owner is one


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