Analyzing the Oracle 10046 Trace File-优快云博客

本文介绍如何使用Oracle提供的工具TKPROF分析10046事件产生的跟踪文件，并通过创建外部表将关键跟踪信息加载到数据库中进行深入分析。

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Loading and Analyzing the 10046 Event

Oracle provides us with a tool, TKPROF, that will analyze a trace file generated via a 10046 event. In fact, it collects summary wait information for each event for you to look at. Often, this might be sufficient, but it would be nice to be able to load critical 10046 trace information into the database to do some analysis both current and even historical. I can even envision some trending that could be done with such data.

To conclude this white paper, I present my first attack at making this information available within the database. I have created 3 external tables that load specific event information from within the trace file. You may well find ways to improve this code, or build on it. I’d love to see what you do to it.

These external tables have been tested on Oracle Database 10g on a Windows XP platform. They should work on other 10g databases. I have not tested them in Oracle9i, so I can’t guarantee they will work there.

The Wait Event External Table

The first external table is designed to load the wait events listed in the 10046 trace file. Notice that in each of the external tables I use the TRACE_ROW_NUM pseudo column to track the actual row number of the event in the trace file. This will allow us to reconstruct the records in the order that they appear in the trace file, which is very important!

Also note that you will need to use the create directory command to create the LOAD_DIRECTORY directory that is referenced in these external tables. Here is the SQL for that command:

create directory load_directory

as 'c:/oracle/product/admin/BOOKTST/udump';

And here is the first external table DDL code. Note that I load in all of the variables related to the particular events to external table columns:

drop table ext_10046_table_wait_events;

create table ext_10046_table_wait_events

(event_type varchar2(10),

cursor_number number,

wait_event_name varchar2(60),

total_elapsed_time number,

p1 varchar2(100),

p2 varchar2(100),

p3 varchar2(100),

trace_row_num number

)

ORGANIZATION EXTERNAL

(TYPE oracle_loader

DEFAULT DIRECTORY load_directory

access parameters

( RECORDS DELIMITED BY NEWLINE

badfile load_directory:'bad_10046.log'

logfile load_directory:'load_10046.log'

skip 24

LOAD WHEN event_type="WAIT"

FIELDS RTRIM

(

event_type CHAR terminated by '#',

cursor_number CHAR terminated by ': nam=',

wait_event_name CHAR terminated by 'ela=',

total_elapsed_time CHAR terminated by 'p1=',

p1 CHAR terminated by 'p2=',

p2 CHAR terminated by 'p3=',

p3 CHAR terminated by WHITESPACE,

trace_row_num recnum

)

location ('booktst_ora_3640.trc')

)

reject limit unlimited;

The Parse, Execute and Fetch Events External Table

Because the parse, execute and fetch record formats are pretty much the same, I loaded them up into a single external table. Here is the code for that table.

drop table ext_10046_table_pef_events;

create table ext_10046_table_pef_events

(event_type varchar2(10),

cursor_number number,

pef_cpu_time number,

pef_elap number,

pef_blocks number,

pef_blocks_cm number,

pef_blocks_curmode number,

pef_lib_cache_misses number,

pef_rows_returned number,

pef_depth number,

pef_goal number,

pef_tim number,

trace_row_num number

)

ORGANIZATION EXTERNAL

(TYPE oracle_loader

DEFAULT DIRECTORY load_directory

access parameters

( RECORDS DELIMITED BY NEWLINE

badfile load_directory:'bad_10046.log'

logfile load_directory:'load_10046.log'

skip 24

LOAD WHEN ( event_type="EXEC"

or event_type="FETCH"

or event_type="PARSE" )

FIELDS RTRIM

(

event_type CHAR terminated by '#',

cursor_number CHAR terminated by ':c=',

pef_cpu_time CHAR terminated by ',e=',

pef_elap CHAR terminated by ',p=',

pef_blocks CHAR terminated by ',cr=',

pef_blocks_cm CHAR terminated by ',cu=',

pef_blocks_curmode CHAR terminated by ',mis=',

pef_lib_cache_misses CHAR terminated by ',r=',

pef_rows_returned CHAR terminated by ',dep=',

pef_depth CHAR terminated by ',og=',

pef_goal CHAR terminated by ',tim=',

pef_tim CHAR terminated by WHITESPACE,

trace_row_num recnum

)

location ('booktst_ora_3640.trc')

)

reject limit unlimited;

The Cursor Record External Table

Ok, now a story. I found out that I got accepted for this presentation about 30 days before it was to be given. I had about a week to put this all in place, get the presentation together and make all the code work. Unfortunately, I had to cut a corner or two, and it was on this table that most of the corners got cut.

I wanted the table to load the cursor related statistics, and the SQL statement itself. I just ran out of time, and could not get the SQL code to load in with the rest of the data. I’m going to try to work on this when I have time, but if you manage to get it working, please let me know and send me updated code if you like!

drop table ext_10046_table_cursor_events;

create table ext_10046_table_cursor_events

(event_type varchar2(40),

cursor_number number,

cur_length number,

cur_dependency number,

cur_uid number,

cur_oct number,

cur_lid number,

cur_tim number,

cur_hv number,

cur_ad varchar2(30),

trace_row_num number

)

ORGANIZATION EXTERNAL

(TYPE oracle_loader

DEFAULT DIRECTORY load_directory

access parameters

( RECORDS DELIMITED BY NEWLINE

badfile load_directory:'bad_10046.log'

logfile load_directory:'load_10046.log'

skip 24

LOAD WHEN ( event_type='PARSING IN CURSOR ' )

FIELDS RTRIM MISSING FIELD VALUES ARE NULL

(

event_type CHAR terminated by '#',

cursor_number CHAR terminated by 'len=',

cur_length CHAR terminated by 'dep=',

cur_dependency CHAR terminated by 'uid=',

cur_uid CHAR terminated by 'oct=',

cur_oct CHAR terminated by 'lid=',

cur_lid CHAR terminated by 'tim=',

cur_tim CHAR terminated by 'hv=',

cur_hv CHAR terminated by "ad='",

cur_ad CHAR terminated by "'",

trace_row_num recnum

)

location ('booktst_ora_2504.trc')

)

reject limit unlimited;

Making it all work

Here are examples of the execution of this code:

select trace_row_num, event_type, cursor_number, wait_event_name

from ext_10046_table_wait_events

where rownum < 5;

TRACE_ROW_NUM EVENT_TYPE CURSOR_NUMBER WAIT_EVENT_NAME

------------- ---------- ------------- --------------------------------

30 WAIT 1 'SQL*Net message to client'

31 WAIT 1 'SQL*Net message from client'

41 WAIT 2 'SQL*Net message to client'

43 WAIT 2 'SQL*Net message from client'

select trace_row_num, event_type, cursor_number

from ext_10046_table_pef_events

where rownum < 5;

TRACE_ROW_NUM EVENT_TYPE CURSOR_NUMBER

------------- ---------- -------------

29 EXEC 1

38 PARSE 2

40 EXEC 2

42 FETCH 2

select distinct b.trace_row_num, sql_text

from v$sql a, ext_10046_table_cursor_events b

where upper(b.cur_ad)=a.address (+)

order by b.trace_row_num;

TRACE_ROW_NUM

-------------

SQL_TEXT

-----------------------------------------------------------------------69

SELECT a.emp_first_name, b.job_name

FROM emp a, job b

WHERE a.job_key=b.job_key

END OF STMT

This join puts all the records together…Again, it isn’t perfect, but what do you expect for free!! J (Ok, so you probably paid to attend the conference, but you did get a 15 page paper from me!)

Column wait_time heading “Wait Time|or|SQL Text”

Column wait_time format a30

select trace_row_num, event_type, cursor_number, wait_event_name, to_char(total_elapsed_time) wait_time

from ext_10046_table_wait_events

union

select trace_row_num, event_type, cursor_number , null, null

from ext_10046_table_pef_events

union

select distinct b.trace_row_num, null, null, null, sql_text

from v$sql a, ext_10046_table_cursor_events b

where upper(b.cur_ad)=a.address (+)

order by 1;