oracle 常用语句

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--查询表的大小select t.owner,       t.segment_name,       (sum(t.blocks) * 8) / 1024 || 'M' as S,       t.segment_type  from dba_segments t where t.owner = 'USER_NAME' group by t.owner, t.segment_name, t.segment_type order by t.owner, S desc--修改表所在表空间select T.owner,  t.segment_name, t.tablespace_name --, sum(t.blocks)  from dba_segments t where t.owner = 'USER_NAME'ORDER BY T.ownerselect 'alter table ' || t.TABLE_NAME || ' move tablespace BIP_TS;' from user_all_tables tselect 'alter index '|| index_name ||' rebuild tablespace BIP_TS;' from user_indexes; --查看索引是否生效  select index_name, index_type, tablespace_name, table_type, status  from user_indexes t where t.tablespace_name = 'TABLESPACENAME'   and status = 'UNUSABLE'-- 清空回收站purge recyclebin;--查询建表语句select dbms_metadata.get_ddl('TABLE','UNIEAP_REPORT_CATEGORY') FROM DUALselect DBMS_METADATA.GET_DDL('TABLESPACE','BIP_TS') FROM DUAL--获取授权信息select dbms_metadata.get_granted_ddl('SYSTEM_GRANT') from dual;--查询表空间使用率的语句select a.a1 表空间名称,       c.c2 类型,       c.c3 区管理,       b.b2 / 1024 / 1024 表空间大小M,       (b.b2 - a.a2) / 1024 / 1024 已使用M,       substr((b.b2 - a.a2) / b.b2 * 100, 1, 5) 利用率  from (select tablespace_name a1, sum(nvl(bytes, 0)) a2          from dba_free_space         group by tablespace_name) a,       (select tablespace_name b1, sum(bytes) b2          from dba_data_files         group by tablespace_name) b,       (select tablespace_name c1, contents c2, extent_management c3          from dba_tablespaces) c where a.a1 = b.b1   and c.c1 = b.b1;--修改分区名alter table TABLE_NAME rename partition OLD_PARTITION_NAME to NEW_PARTITION_NAME;--查询分区脚本select TABLE_NAME ,PARTITION_NAME from user_tab_partitions where table_name like '%'select TABLE_NAME ,PARTITION_NAME from user_tab_partitions where table_name like '%'--查询索引脚本SELECT INDEX_NAME,TABLE_NAME FROM USER_INDEXES WHERE INDEX_NAME LIKE '%'--查看oracle连接用户select s.USERNAME,s.MACHINE from v$session s where s.STATUS = 'ACTIVE'--查看oracle最大连接数select value from v$parameter where name = 'processes' 修改最大连接数:alter system set processes = 300 scope = spfile;