oracle经典性能查询

oracle 常用经典 SQL 查询

常用 SQL 查询：

1 、查看表空间的名称及大小

select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_siz e

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,

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

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

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_siz e,

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,

s.program program,

s.status session_status

from v$session

where s.paddr = p.addr and

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$rollstat.rssiz e Siz e_in_Bytes, v$rollstat.xacts XActs,

v$rollstat.gets Gets, v$rollstat.waits

Waits,

v$rollstat.writes Writes,

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

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,

v$lock l where s.sid = l.sid ) ls where o.object_id = ls.id1 and o.owner

<> 'SYS' order by o.owner, o.object_name

17 。查看等待（ wait ）情况

SELECT v$waitstat.class, v$waitstat.count count, SUM(v$sysstat.value) sum_value

FROM v$waitstat, v$sysstat WHERE v$sysstat.name IN ('db block gets',

'consistent gets') group by v$waitstat.class, v$waitstat.count

18 。查看 sga 情况

SELECT NAME, BYTES FROM SYS.V_$SGASTAT ORDER BY NAME ASC

19 。查看 catched object

SELECT owner, name, db_link, namespace,

EXECUTIONS,

USERS_EXECUTING, LOADS, FIRST_LOAD_TIME, INVALIDATIONS, PARSE_CALLS,

DISK_READS,

BUFFER_GETS, ROWS_PROCESSED FROM V$SQLAREA

21 。查看 object 分类数量

select decode (o.type#,1,'INDEX'

,

'CLUSTER'

,

4, 'VIEW'

,

5

,

'SYNONYM'

,

6

,

sys.obj$ o where o.type# > 1 group by decode (o.type#,1,'INDEX'

,

3

,

'CLUSTER'

4, 'VIEW'

,

5

,

,

6

,

'COLUMN'

count(*) from

o.owner# and u.name <> 'PUBLIC' group by u.name order by

sys.link$ union select 'CONSTRAINT'

,

count(*) from sys.con$

23 。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,

status session_status, s.terminal terminal, s.program program,

s.username user_name, s.fixed_table_sequence activity_meter, '' query,

0 memory, 0 max_memory, 0 cpu_usage, s.sid, s.serial# serial_num

from v$session

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,

where v.sid = 71 and

v.statistic# = n.statistic#

order by n.class, n.statistic#

select /*+ PUSH_SUBQ */

command_type,

sql_text,

sharable_mem,

persistent_mem,

runtime_mem,

sorts,

loads,

first_load_time,

invalidations,

parse_calls,

disk_reads,

buffer_gets,

rows_processed,

sysdate start_time,

'>'

|| address sql_address,

'N' status

from v$sqlarea

where address = (select sql_address from v$session where sid = 71)

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,