一文搞定oracle數據庫性能檢查

一、主機配置

1.主機名

hostname

2.os版本

cat /proc/version

3.CPU

個數：

cat /proc/cpuinfo| grep "physical id"| sort| uniq| wc -l

AIX：

prtconf|grep Processors

核數

cat /proc/cpuinfo| grep "cpu cores"| uniq

AIX：

pmcycles -m

4.物理內存、虛擬內存

free -g   Mem是物理內存  Swap是虛擬內存

5.主機型號

dmidecode | grep "Product Name"

AIX：

uname -M

二、操作系統內核參數

ulimit -a

三、操作系統資源利用率

top

CUP使用狀況： top 第三行 id
內存使用狀況：top 第四行內存 free/total
I/O使用狀況： top 第三行 wa I/O等待佔CPU百分比
磁盤使用情況： df -lh

四、數據庫運行情況

1.數據文件

select file_name,bytes/1048576,AUTOEXTENSIBLE,INCREMENT_BY , STATUS from dba_data_files;

2.表空間

select a.tablespace_name as tablespace_name, 
       round(a.bytes/(1024*1024),2) as "total(M)", 
       round(b.bytes/(1024*1024),2) as "used(M)", 
       round(c.bytes/(1024*1024),2) as "free(M)", 
       round((b.bytes * 100)/a.bytes,2) "% USED ", 
       round((c.bytes * 100)/a.bytes,2) "% 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;

select tablespace_name,round(maxbytes/1024/1024/1024,2) as "max(G)" from dba_data_files; --可擴展空間

3.內存使用情況

select name,bytes/1024/1024/1024 ,resizeable from v$sgainfo ;
select POOL ,NAME ,BYTES/1024/1024  from v$sgastat where name ='log_buffer';

4.檢查oracle實例狀態

select instance_name,host_name,startup_time,status,database_status from v$instance;

5.檢查oracle在線日誌狀態

select group#,status,type,member from v$logfile;

6.檢查oracle表空間狀態

select tablespace_name,status from dba_tablespaces;

7.檢查是否存在無效對象

select owner, object_name, object_type from dba_objects where status= 'INVALID';

8.檢查緩衝區命中率

select a.value + b.value logical_reads,c.value phys_reads,
       round(100 * (1 - c.value / (a.value + b.value)), 4) hit_ratio
 	from v$sysstat a, v$sysstat b, v$sysstat c
where a.name = 'db block gets'
  	 and b.name = 'consistent gets'
  	 and c.name = 'physical reads';

9.檢查死鎖及處理狀態

select sid, serial#,username,schemaname,osuser,machine,terminal,program,owner,
       object_name,object_type,o.object_id
 	from dba_objects o, v$locked_object l, v$session s
where o.object_id = l.object_id and s.sid = l.session_id;

10.檢查前10條性能差的sql

select * from (
select parsing_user_id  executions, sorts, command_type,disk_reads, sql_text
from v$sqlarea order by disk_reads desc
) where rownum < 10;

11.查詢數據庫中佔用空間較大的表

select table_name,num_rows,avg_row_len,blocks, round(num_rows*avg_row_len/(1024*1024),2) as "daxiaooo(M)",blocks*8/1024
from user_tables order by num_rows desc;

12.表空間增長趨勢

select tablespace_name , sum(t.bytes / 1024 / 1024) "佔用空間(M)"
			from dba_segments t
			group by tablespace_name order by tablespace_name,sum(t.BYTES/1024/1024) desc;

13.數據量整數TOP10

select table_name,num_rows,avg_row_len,blocks, round(num_rows*avg_row_len/(1024*1024),2) as "daxiaooo(M)",blocks*8/1024
from user_tables order by num_rows desc;