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这篇文章主要介绍了 oratop 工具怎么用，具有一定借鉴价值，感兴趣的朋友可以参考下，希望大家阅读完这篇文章之后大有收获，下面让丸趣 TV 小编带着大家一起了解一下。

Doc ID 1500864.1
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oratop -h
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./oratop -i 5 -b -d / as sysdba

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Oratop 源自 MOS 的一篇文章和工具链接（oratop – utility for near real-time monitoring of databases, RAC and Single Instance [ID 1500864.1]）。
从名称上看，Oratop 最大特点是支持实时轻量级监控。在 Oracle 12c 的 EM Express 之前，OEM 还是一个重体积的组件。
相比之下，oratop 完全适合那些想使用数据库实时监控功能，但是又不愿意启动 OEM 的用户需要。

主要功能

监控当前的数据库活动；
监控数据库性能；
识别当前阻塞会话和瓶颈

增强功能
SQL 监控
数据库服务
多租户
ADG

共四部分
1、全局数据库信息
2、数据库实例活动
3、前五等待事件
4、进程和 SQL 信息

远程连接

Using Easy Connect (EZConnect)
 Non-default port
oratop system/manager@dbhost:4800/db1.domain.com
Default port (1521):
oratop system/manager@dbhost/db1.domain.com

动态帮助命令

Interactive Keys: [default]
  d : toggle between [Cumulative (C)] Real-Time (RT) (section 3)
  k : toggle between [EVENT/LATCH] object FILE#:BLOCK# (proc section 4)
  m : Toggle between [USERNAME/PROGRAM] MODULE/ACTION (proc section 4)
  s : switch to SQL mode (section 4)
  f : toggle between [standard] detailed format (long)
  p : switch to [process] mode (section 4)
  t : tablespace information
  a : ASM diskgroup information
  x : basic SQL plan table (requires sql_id input)
  i : refresh interval, requires value in seconds [5s]
  q : quit/ exit program (also, { Q | Esc | function keys})

Abbreviations:
  [N/B]: count(N)/ Byte(B) – (k)illo, (M)ega, (G)iga, (T)erra, [PEZY]
  [T]  : Time – (u)micro, (m)illi, (s)econd, (h)our, (d)ay, (y)ear
  [m/s]: stats interval size, (m) 1 minute, (s) 15s, else, Real Time
  [c]  : database service centric

Acronym Help Menu:
  Section 1 – DATABASE  .. [1]
  Section 2 – INSTANCE  .. [2]
  Section 3 – DB WAIT EVENTS  .. [3]
  Section 4 – PROCESS  .. [4]
  Quit Help  .. (q|Q)
   
   
   
每部分参数的意思

Section 1 – database
  Global Database information

  Version  : Oracle major version
  db name  : db_unique_name
  time  [s]: time as of the most recent stats (hh34:mi:ss)
  up  [T]: database uptime
  ins  [N]: total number of instance(s)
  sn  [c,N]: total user sessions (active/inactive)
  us  [c,N]: number of distinct users
  mt  [s,N]: global database memory total (sga+pga)
  % db  [s,N]: database time as %(dbtime/cpu) (red if 99%)

Section 2 – instance
  Top 5 Instance(s) Activity
  o Ordered by Database time desc

  ID  [c,N]: inst_id (instance id)
  %CPU  [m,N]: host cpu busy %(busy/busy+idle). (red if 90%)
  LOAD  [m,N]: current os load. (red if 2*#cpu high cpu)
  %DCU  [m,N]: db cpu otusef as %host cpu. (red if 99% high AAS)
  AAS  [s,N]: Average Active Sessions. (red if #cpu)
  ASC  [c,N]: active Sessions on CPU
  ASI  [c,N]: active Sessions waiting on user I/O
  ASW  [c,N]: active Sessions Waiting, non-ASI (red if ASC+ASI)
  AST  [c,N]: Active user Sessions Total (ASC+ASI+ASW)
  IOPS  [m,N]: i/o requests per second
  %FR  [s,N]: shared pool free %
  PGA  [s,N]: total pga allocated
  UTPS  [s,N]: user transactions per sec
  UCPS  [c,m,N]: user calls per sec
  SSRT  [c,m,T]: sql service response time (T/call)
  %DBT  [s,N]: instance %Database Time (e.g. non-rac shows 100%)
Section 3 – db wait events
  Top 5 Timed Events
  o Cluster-wide, non-idle
  o Ordered by wait time desc

  EVENT  : wait event name. (red if active)
  (C)  : Cumulative since instance startup
  WAITS  : total waits
  TIME(s)  : total wait time in seconds)
  AVG_MS  : average wait time in milliseconds
  PCT  : percent of wait time (all events)
  WAIT_CLASS : name of the wait class
 
Section 4 – process
  o Non-Idle processes
  o Ordered by event wait time desc

  ID  [N]: inst_id. (red if blocking)
  SID  [N]: session identifier. (red if blocking)
  SPID  [N]: server process os id
  USR  : user name
  PROG  : process program name
  S  : SERVER (dedicated, shared, etc.)
  PGA  [N]: pga_used_mem. (red if continuously growing)
  SQL_ID/BLOCKER : sql_id or the final blocker s (inst:sid, in red)
  OPN  : operation name, e.g. select
  E/T  [T]: session elapsed time (active/inactive)
  STA  : ACTive|INActive|KILled|CAChed|SNIped
  STE  : process state, e.g. on CPU or user I/O or WAIting
  EVENT/*LA  : session wait event name. Auto toggle with (*latch name)
  (red if process is hung/spin)
  W/T  [T]: event wait time. (red if 1s)   

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