Ora10G 用ASH生成性能报告

报告内容:TOP等待事件,TOP SQL,TOP SQL命令类型,TOP Session内容.

具体实现方式:
SQL> @$ORACLE_HOME/rdbms/admin/ashrpt.sql

Current Instance
~~~~~~~~~~~~~~~~

DB Id DB Name Inst Num Instance
----------- ------------ -------- ------------
631770879 ORA10 1 ora10

Specify the Report Type
~~~~~~~~~~~~~~~~~~~~~~~
Enter 'html' for an HTML report, or 'text' for plain text
Defaults to 'html'
Enter value for report_type: text --输入产生的报告文件类型

Type Specified: text

Instances in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

DB Id Inst Num DB Name Instance Host
------------ -------- ------------ ------------ ------------
* 631770879 1 ORA10 ora10 linux

Defaults to current database

Using database id: 631770879

Defaults to current instance

Using instance number: 1

ASH Samples in this Workload Repository schema
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Oldest ASH sample available: 12-Mar-08 12:22:57 [ 10246 mins in the past]
Latest ASH sample available: 19-Mar-08 15:05:08 [ 4 mins in the past]

Specify the timeframe to generate the ASH report
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Enter begin time for report:

-- Valid input formats:
-- To specify absolute begin time:
-- [MM/DD[/YY]] HH24:MI[:SS]
-- Examples: 02/23/03 14:30:15
-- 02/23 14:30:15
-- 14:30:15
-- 14:30
-- To specify relative begin time: (start with '-' sign)
-- -[HH24:]MI
-- Examples: -1:15 (SYSDATE - 1 Hr 15 Mins)
-- -25 (SYSDATE - 25 Mins)

Defaults to -15 mins
Enter value for begin_time: 14:40 --输入开始时间
Report begin time specified: 14:40

Enter duration in minutes starting from begin time:
Defaults to SYSDATE - begin_time
Press Enter to analyze till current time
Enter value for duration: 20 --输入要统计的时间间隔
Report duration specified: 20

Using 19-Mar-08 14:40:00 as report begin time
Using 19-Mar-08 15:00:00 as report end time

Specify Slot Width (using ashrpti.sql) for 'Activity Over Time' section
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-- Explanation:
-- In the 'Activity Over Time' section of the ASH report,
-- the analysis period is divided into smaller slots
-- and top wait events are reported in each of those slots.

-- Default:
-- The analysis period will be automatically split upto 10 slots
-- complying to a minimum slot width of
-- 1 minute, if the source is V$ACTIVE_SESSION_HISTORY or
-- 5 minutes, if the source is DBA_HIST_ACTIVE_SESS_HISTORY.

Specify Slot Width in seconds to use in the 'Activity Over Time' section:
Defaults to a value as explained above:
Slot Width specified:

Specify Report Targets (using ashrpti.sql) to generate the ASH report
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

-- Explanation:
-- ASH Report can accept "Report Targets",
-- like a particular SQL statement, or a particular SESSION,
-- to generate the report on. If one or more report targets are
-- specified, then the data used to generate the report will only be
-- the ASH samples that pertain to ALL the specified report targets.

-- Default:
-- If none of the report targets are specified,
-- then the target defaults to all activity in the database instance.

Specify SESSION_ID (eg: from V$SESSION.SID) report target:
Defaults to NULL:
SESSION report target specified:

Specify SQL_ID (eg: from V$SQL.SQL_ID) report target:
Defaults to NULL: (% and _ wildcards allowed)
SQL report target specified:

Specify WATI_CLASS name (eg: from V$EVENT_NAME.WAIT_CLASS) report target:
[Enter 'CPU' to investigate CPU usage]
Defaults to NULL: (% and _ wildcards allowed)
WAIT_CLASS report target specified:

Specify SERVICE_HASH (eg: from V$ACTIVE_SERVICES.NAME_HASH) report target:
Defaults to NULL:
SERVICE report target specified:

Specify MODULE name (eg: from V$SESSION.MODULE) report target:
Defaults to NULL: (% and _ wildcards allowed)
MODULE report target specified:

Specify ACTION name (eg: from V$SESSION.ACTION) report target:
Defaults to NULL: (% and _ wildcards allowed)
ACTION report target specified:

Specify CLIENT_ID (eg: from V$SESSION.CLIENT_IDENTIFIER) report target:
Defaults to NULL: (% and _ wildcards allowed)
CLIENT_ID report target specified:

EXT
----
.txt

Specify the Report Name
~~~~~~~~~~~~~~~~~~~~~~~
The default report file name is ashrpt_1_0319_1500.txt. To use this name,
press <return> to continue, otherwise enter an alternative.
Enter value for report_name: --这里直接按回车,或者更改文件名.

Using the report name ashrpt_1_0319_1500.txt

Summary of All User Input
-------------------------
Format : TEXT
DB Id : 631770879
Inst num : 1
Begin time : 19-Mar-08 14:40:00
End time : 19-Mar-08 15:00:00
Slot width : Default
Report targets : 0
Report name : ashrpt_1_0319_1500.txt

产生的报告内容如下:

oracle@linux:/SERVER/soft> cat ashrpt_1_0319_1500.txt

ASH Report For ORA10/ora10

DB Name DB Id Instance Inst Num Release RAC Host
------------ ----------- ------------ -------- ----------- --- ------------
ORA10 631770879 ora10 1 10.2.0.1.0 NO linux

CPUs SGA Size Buffer Cache Shared Pool ASH Buffer Size
---- ------------------ ------------------ ------------------ ------------------
1 160M (100%) 72M (45.0%) 68M (42.5%) 2.0M (1.3%)

Analysis Begin Time: 19-Mar-08 14:40:00
Analysis End Time: 19-Mar-08 15:00:00
Elapsed Time: 20.0 (mins)
Sample Count: 29
Average Active Sessions: 0.02
Avg. Active Session per CPU: 0.02
Report Target: None specified

Top User Events DB/Inst: ORA10/ora10 (Mar 19 14:40 to 15:00)

Avg Active
Event Event Class % Activity Sessions
----------------------------------- --------------- ---------- ----------
CPU + Wait for CPU CPU 51.72 0.01
db file sequential read User I/O 6.90 0.00
null event Other 6.90 0.00
-------------------------------------------------------------

Top Background Events DB/Inst: ORA10/ora10 (Mar 19 14:40 to 15:00)

Avg Active
Event Event Class % Activity Sessions
----------------------------------- --------------- ---------- ----------
CPU + Wait for CPU CPU 17.24 0.00
os thread startup Concurrency 17.24 0.00
Activity Over Time DB/Inst: ORA10/ora10 (Mar 19 14:40 to 15:00)
-> Analysis period is divided into smaller time slots
-> Top 3 events are reported in each of those slots
-> 'Slot Count' shows the number of ASH samples in that slot
-> 'Event Count' shows the number of ASH samples waiting for
that event in that slot
-> '% Event' is 'Event Count' over all ASH samples in the analysis period

Slot Event
Slot Time (Duration) Count Event Count % Event
-------------------- -------- ------------------------------ -------- -------
14:40:00 (2.0 min) 15 CPU + Wait for CPU 14 48.28
db file sequential read 1 3.45
14:42:00 (2.0 min) 5 CPU + Wait for CPU 3 10.34
os thread startup 2 6.90
14:44:00 (2.0 min) 3 db file sequential read 1 3.45
null event 1 3.45
os thread startup 1 3.45
14:46:00 (2.0 min) 3 os thread startup 2 6.90
CPU + Wait for CPU 1 3.45
14:50:00 (2.0 min) 1 CPU + Wait for CPU 1 3.45
14:56:00 (2.0 min) 1 CPU + Wait for CPU 1 3.45
14:58:00 (2.0 min) 1 null event 1 3.45
-------------------------------------------------------------
End of Report

注:ASH 的信息,以V$SESSION为基础,每秒采样一次,记录活动会话等待的事件. 可以在V$ACTIVE_SESSION_HISOTRY视图中访问到相关的信息.