1、查看表空间的名称及大小 select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size from dba_tabl
1、查看表空间的名称及大小
select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name;
2、查看表空间物理文件的名称及大小
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name;
3、查看回滚段名称及大小
select segment_name, tablespace_name, r.status,
(initial_extent/1024) initialextent,(next_extent/1024) nextextent,
max_extents, v.curext curextent
from dba_rollback_segs r, v$rollstat v
where r.segment_id = v.usn(+)
order by segment_name ;
4、查看控制文件
select name from v$controlfile;
5、查看日志文件
select member from v$logfile;
6、查看表空间的使用情况
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
select a.tablespace_name,a.bytes total,b.bytes used, c.bytes free,
(b.bytes*100)/a.bytes % used,(c.bytes*100)/a.bytes % free
from sys.sm$ts_avail a,sys.sm$ts_used b,sys.sm$ts_free c
where a.tablespace_name=b.tablespace_name and a.tablespace_name=c.tablespace_name;
7、查看数据库库对象
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　
select version from product_component_version
where substr(product,1,6)='oracle';
9、查看数据库的创建日期和归档方式
select created, log_mode, log_mode from v$database;　
10、捕捉运行很久的sql
column username format a12
column opname format a16
column progress format a8
select username,sid,opname,
round(sofar*100 / totalwork,0) '%' as progress,
time_remaining,sql_text
from v$session_longops , v$sql
where time_remaining 0
and sql_address = address
and sql_hash_value = hash_value
/
11、查看数据表的参数信息
select partition_name, high_value, high_value_length, tablespace_name,
pct_free, pct_used, ini_trans, max_trans, initial_extent,
next_extent, min_extent, max_extent, pct_increase, freelists,
freelist_groups, logging, buffer_pool, num_rows, blocks,
empty_blocks, avg_space, chain_cnt, avg_row_len, sample_size,
last_analyzed
from dba_tab_partitions
--where table_name = :tname and table_owner = :towner
order by partition_position
12、查看还没提交的事务
select * from v$locked_object;
select * from v$transaction;
13、查找object为哪些进程所用
select
p.spid,
s.sid,
s.serial# serial_num,
s.username user_name,
a.type object_type,
s.osuser os_user_name,
a.owner,
a.object object_name,
decode(sign(48 - command),
1,
to_char(command), 'action code #' to_char(command) ) action,
p.program oracle_process,
s.terminal terminal,
s.program program,
s.status session_status
from v$session s, v$access a, v$process p
where s.paddr = p.addr and
s.type = 'user' and
a.sid = s.sid and
a.object='subscriber_attr'
order by s.username, s.osuser
14、回滚段查看
select rownum, sys.dba_rollback_segs.segment_name name, v$rollstat.extents
extents, v$rollstat.rssize size_in_bytes, v$rollstat.xacts xacts,
v$rollstat.gets gets, v$rollstat.waits waits, v$rollstat.writes writes,
sys.dba_rollback_segs.status status from v$rollstat, sys.dba_rollback_segs,
v$rollname where v$rollname.name(+) = sys.dba_rollback_segs.segment_name and
v$rollstat.usn (+) = v$rollname.usn order by rownum
15、耗资源的进程（top session）
select s.schemaname schema_name, decode(sign(48 - command), 1,
to_char(command), 'action code #' to_char(command) ) action, status
session_status, s.osuser os_user_name, s.sid, p.spid , s.serial# serial_num,
nvl(s.username, '[oracle process]') user_name, s.terminal terminal,
s.program program, st.value criteria_value from v$sesstat st, v$session s , v$processp
where st.sid = s.sid and st.statistic# = to_number('38') and ('all' = 'all'
or s.status = 'all') and p.addr = s.paddr order by st.value desc, p.spid asc, s.username asc, s.osuser asc
，