如何远程判断Oracle数据库的安装平台select * from v$version;
查看表空间的使用情况
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name;
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,/
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE CWHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME AND A.TABLESPACE_NAME=C.TABLESPACE_NAME;
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 dwhere 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 CurExtentfrom dba_rollback_segs r, v$rollstat vWhere r.segment_id = v.usn(+)order by segment_name ;
4、查看控制文件select name from v$controlfile;
5、查看日志文件select member from v$logfile;6、查看表空间的使用情况/ /8 r) Q4 |& @; }% vselect sum(bytes)/(1024*1024) as free_space,tablespace_namefrom dba_free_spacegroup by tablespace_name;:
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE CWHERE 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信
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$Database;
10、如何远程判断Oracle数据库的安装平台;
select * from v$version;
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 = :townerORDER BY partition_position
12、查看还没提交的事务select * from v$locked_object;
select * from v$transaction;
14、回滚段查看
select rownum, sys.dba_rollback_segs.segment_name Name, v$rollstat.extentsExtents, v$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$rollname.name(+) = sys.dba_rollback_segs.segment_name and4 E5 N* z2 e7 v) T! g7 S0 q( yv$rollstat.usn (+) = v$rollname.usn order by rownum
15、捕捉运行很久的SQLcolumn username format a12column opname format a16column progress format a8' J$ E; F9 _: kselect username,sid,opname, round(sofar*100 / totalwork,0) || '%' as progress,4 Z! z) O& Q& g& M) b% C7 ` time_remaining,sql_text
from v$session_longops , v$sqlwhere time_remaining <> 0and sql_address = addressand sql_hash_value = hash_value
16。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_partitionsq% l5 g) ]9 W --WHERE table_name = :tname AND table_owner = :townerORDER BY partition_position
17。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 / o1 N: T7 L0 W! ?( /6 `from v$session s, v$access a, v$process pwhere s.paddr = p.addr and s.type = 'USER' and a.sid = s.sid and
a.object='SUBSCRIBER_ATTR'dware.cn:88883 ` x4 @( x2 L5 l2 Q4 i" l+ a+ [order by s.username, s.osuser
18。耗资源的进程（top session）s.schemaname schema_name, decode(sign(48 - command), 1,to_char(command), 'Action Code #' || to_char(command) ) action, statussession_status, s.osuser os_user_name, s.sid, p.spid , s.serial# serial_num, nvl(s.username, '[Oracle process]') user_name, s.terminal terminal,
s.program program, st.value criteria_value from v$sesstat st, v$session s , v$process p
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
19。查看锁（lock）情况select /*+ RULE */ ls.osuser os_user_name, ls.username user_name,
decode(ls.type, 'RW', 'Row wait enqueue lock', 'TM', 'DML enqueue lock', 'TX',
'Transaction enqueue lock', 'UL', 'User supplied lock') lock_type,
o.object_name object, decode(ls.lmode, 1, null, 2, 'Row Share', 3,
'Row Exclusive', 4, 'Share', 5, 'Share Row Exclusive', 6, 'Exclusive', null)lock_mode, o.owner, ls.sid, ls.serial# serial_num, ls.id1, ls.id2 from sys.dba_objects o, ( select s.osuser, s.username, l.type, ) I* Z$ X9 E( Q1 b( o/ h! Hl.lmode, s.sid, s.serial#, l.id1, l.id2 from v$session s, v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner2 j& q" J" k/ z4 j2 s2 B# d9 o, K. H2 i<> 'SYS' order by o.owner, o.object_nameoa.headware.cn:8888* K/ y; V' c+ `" A根据sid查是哪台电脑的链接column osuser format a15column username format a10
column machine format a30
select osuser,machine,username,sid,serial# from v$session where sid='128';根据sid查对应的sql
select SID,SQL_TEXT from v$open_cursor where SID='128';&
20。查看等待（wait）情况oa.headware.cn:8888) O) a/ F. R2 a! T/ n h _SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_valueFROM v$waitstat, v$sysstat WHERE v$sysstat.name IN ('db block gets',
'consistent gets') group by v$waitstat.class, v$waitstat.count
21。查看sga情况SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC
22。查看catched object1
SELECT owner, name, db_link, namespace,
type, sharable_mem, loads, executions,
locks, pins, kept FROM v$db_object_cache 查看V$SQLAREA6 b* h8 H6 w( C; R& h( G6 D4 xSELECT SQL_TEXT, SHARABLE_MEM, PERSISTENT_MEM, RUNTIME_MEM, SORTS,
VERSION_COUNT, LOADED_VERSIONS, OPEN_VERSIONS, USERS_OPENING, EXECUTIONS,USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS,DISK_READS,9 n) N! t: m2 w' h. f: K. m* w) DBUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA
24。查看object分类数量select decode (o.type#,1,'INDEX' , 2,'TABLE' , 3 , 'CLUSTER' , 4, 'VIEW' , 5 ,
'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) object_type , count(*) quantity from
sys.obj$ o where o.type# > 1 group by decode (o.type#,1,'INDEX' , 2,'TABLE' , 3, 'CLUSTER' , 4, 'VIEW' , 5 , 'SYNONYM' , 6 , 'SEQUENCE' , 'OTHER' ) union select'COLUMN' , count(*) from sys.col$ union select 'DB LINK' , count(*) from
25。按用户查看object种类select u.name schema, sum(decode(o.type#, 1, 1, NULL)) indexes,sum(decode(o.type#, 2, 1, NULL)) tables, sum(decode(o.type#, 3, 1, NULL))
clusters, sum(decode(o.type#, 4, 1, NULL)) views, sum(decode(o.type#, 5, 1,
NULL)) synonyms, sum(decode(o.type#, 6, 1, NULL)) sequences,
sum(decode(o.type#, 1, NULL, 2, NULL, 3, NULL, 4, NULL, 5, NULL, 6, NULL, 1))others from sys.obj$ o, sys.user$ u where o.type# >= 1 and u.user# =o.owner# and u.name <> 'PUBLIC' group by u.name order bysys.link$ union select 'CONSTRAINT' , count(*) from sys.con$
26。有关connection的相关信息
1）查看有哪些用户连接
select s.osuser os_user_name, decode(sign(48 - command), 1, to_char(command),'Action Code #' || to_char(command) ) action, p.program oracle_process, V5 z! B; J cstatus session_status, s.terminal terminal, s.program program,
s.username user_name, s.fixed_table_sequence activity_meter, '' query,
' h9 ~0 f! b5 /! }0 memory, 0 max_memory, 0 cpu_usage, s.sid, s.serial# serial_num
from v$session s, v$process p where s.paddr=p.addr and s.type = 'USER'
order by s.username, s.osuser
2）根据v.sid查看对应连接的资源占用等情况select n.name,
v.value,n.class,}( u+ i$ J. mn.statistic#
from v$statname n,
v$sesstat v
where v.sid = 71 and
v.statistic# = n.statistic#order by n.class, n.statistic#3）根据sid查看对应连接正在运行的sqlselect /*+ PUSH_SUBQ */
command_type,sql_text,sharable_mem,zpersistent_mem,runtime_mem,4 A+ ?* q5 E9 c6 Tsorts,version_count,loaded_versions,open_versions,users_opening,executions,users_executing,loads,
first_load_time,invalidations,parse_calls,disk_reads,buffer_gets,rows_processed,sysdate start_time,sysdate finish_time,'>' || address sql_address,
'N' status
from v$sqlarea
where address = (select sql_address from v$session where sid = 71)
27．查询表空间使用情况select a.tablespace_name "表空间名称",100-round((nvl(b.bytes_free,0)/a.bytes_alloc)*100,2) "占用率(%)",round(a.bytes_alloc/1024/1024,2) "容量(M)",round(nvl(b.bytes_free,0)/1024/1024,2) "空闲(M)",
round((a.bytes_alloc-nvl(b.bytes_free,0))/1024/1024,2) "使用(M)",
Largest "最大扩展段(M)",to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') "采样时间"from (select f.tablespace_name, sum(f.bytes) bytes_alloc, sum(decode(f.autoextensible,'YES',f.maxbytes,'NO',f.bytes)) maxbytes
from dba_data_files f
group by tablespace_name) a,(select f.tablespace_name,
sum(f.bytes) bytes_freefrom dba_free_space fgroup by tablespace_name) b,(select round(max(ff.length)*16/1024,2) Largest,
ts.name tablespace_namefrom sys.fet$ ff, sys.file$ tf,sys.ts$ tswhere ts.ts#=ff.ts# and ff.file#=tf.relfile# and ts.ts#=tf.ts#group by ts.name, tf.blocks) cwhere a.tablespace_name = b.tablespace_name and a.tablespace_name = c.tablespace_name
28. 查询表空间的碎片程度select tablespace_name,count(tablespace_name) from dba_free_space group by tablespace_name
having count(tablespace_name)>10;alter tablespace name coalesce;alter table name deallocate unused;
create or replace view ts_blocks_v asselect tablespace_name,block_id,bytes,blocks,'free space' segment_name from dba_free_spaceunion all
select tablespace_name,block_id,bytes,blocks,segment_name from dba_extents;select * from ts_blocks_v;
select tablespace_name,sum(bytes),max(bytes),count(block_id) from dba_free_space
group by tablespace_name;
29。查询有哪些数据库实例在运行select inst_name from v$active_instances;
30. 查找oracle性能瓶颈sql
select sql_text,spid,v$session.program,process from
v$sqlarea,v$session,v$processwhere v$sqlarea.address=v$session.sql_address
and v$sqlarea.hash_value=v$session.sql_hash_valueand v$session.paddr=v$process.addr
and v$process.spid in (操作系统PID);
select sid,event,p1,p1text from v$session_wait;
31. 找出最耗资源的sql
select * from v$process where spid='2796';select sql_hash_value,machine,username,program from v$session where PAddr='63B7A584';select * from v$sqltext where hash_value='833203018';select * from v$sql where hash_value='833203018';select * from v$sqlarea where hash_value='833203018';SELECT a.username,a.machine,a.program,a.sid,a.serial#,a.status,c.piece,c.sql_text FROM v$session a,v$process b,
v$sqltext c WHERE b.spid='2796' AND b.addr=a.paddr AND a.sql_address=c.address(+) ORDER BY c.piece
要找出最耗资源的sql，我们可以首先使用top等工具，找到最好资源的进程（记住进程号），例如，操作系统进程号为2796，然后根据这个进程号(v$process.spid)在v$process中找到进程地址(v$process.addr)，然后根据这个地址在 v$session中找到相应的sid(v$session.sid)，然后根据这个sid找到相应的hash alue（v$session. sql_hash_value），然后根据这个hash alue在v$sqltext，$sql，v$sqlarea等视图中找到对应的sql语句（sql_text）。select * from v$process where spid='2796';select sql_hash_value,machine,username,program from v$session where PAddr='63B7A584';
select * from v$sqltext where hash_value='833203018';
select * from v$sql where hash_value='833203018';
select * from v$sqlarea where hash_value='833203018';
SELECT a.username,a.machine,a.program,a.sid,a.serial#,a.status,c.piece,c.sql_text FROM v$session a,v$process b,
v$sqltext c WHERE b.spid='2796' AND b.addr=a.paddr AND a.sql_address=c.address(+) ORDER BY c.piece
