OracleSQL查询的实操简介
发布时间：2010/5/10 11:21:35 来源：城市学习网 编辑：ziteng
以下的文章主要介绍的是Oracle SQL查询的介绍，Oracle SQL查询之所以能在很短的时间内被人们广泛的应用，原因也是因为它独特的功能。以下的文章将会给你提供相关的知识。望你会有所收获。
常用SQL查询：
1、查看表空间的名称及大小
1.select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
2.from dba_tablespaces t, dba_data_files d
3.where t.tablespace_name = d.tablespace_name
4.group by t.tablespace_name;
2、查看表空间物理文件的名称及大小
1.select tablespace_name, file_id, file_name,
2.round(bytes/(1024*1024),0) total_space
3.from dba_data_files
4.order by tablespace_name;
3、查看回滚段名称及大小
1.select segment_name, tablespace_name, r.status,
2.(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,
3.max_extents, v.curext CurExtent
4.From dba_rollback_segs r, v$rollstat v
5.Where r.segment_id = v.usn(+)
6.order by segment_name;
4、查看控制文件
1.select name from v$controlfile;
5、查看日志文件
1.select member from v$logfile;
6、查看表空间的使用情况
1.select sum(bytes)/(1024*1024) as free_space,tablespace_name
2.from dba_free_space
3.group by tablespace_name;
4.SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
5.(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
6.FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C
7.WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;
7、查看数据库库对象
1.select owner, object_type, status, count(*) count
# from all_objects group by owner, object_type, status;
8、查看数据库的版本
1.Select version FROM Product_component_version
2.Where SUBSTR(PRODUCT,1,6)='Oracle';
9、查看数据库的创建日期和归档方式
1.Select Created, Log_Mode, Log_Mode From V$Database;
10、捕捉运行很久的Oracle SQL
1.column username format a12
2.column opname format a16
3.column progress format a8
4.select username,sid,opname,
5.round(sofar*100 / totalwork,0) || '%' as progress,
6.time_remaining,sql_text
7.from v$session_longops , v$sql
8.where time_remaining <> 0
9.and sql_address = address
10.and sql_hash_value = hash_value
11./
11。查看数据表的参数信息
1.SELECT partition_name, high_value, high_value_length, tablespace_name,
2.pct_free, pct_used, ini_trans, max_trans, initial_extent,
3.next_extent, min_extent, max_extent, pct_increase, FREELISTS,
4.freelist_groups, LOGGING, BUFFER_POOL, num_rows, blocks,
5.empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
6.last_analyzed
7.FROM dba_tab_partitions
8.--WHERE table_name = :tname AND table_owner = :towner
9.ORDER BY partition_position
12.查看还没提交的事务
1.select * from v$locked_object;
2.select * from v$transaction;
以上的相关内容就是对Oracle SQL查询的介绍，望你能有所收获。
