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Sep
24
2010
How to execute TKPROF on trace files larger than 2GB ? --> Use pipe E-mail

Here is a nice trick to work with files larger than 2GB on Unix/Linux using pipe.

First case - TKPROF

When trying to execute TKPROF on a trace file larger than 2 GB I got this error:

[udump]$ ll test_ora_21769.trc

-rw-r-----  1 oratest dba 2736108204 Jun 23 11:04 test_ora_21769.trc

[udump]$ tkprof test_ora_21769.trc test_ora_21769.out

TKPROF: Release 9.2.0.6.0 - Production on Thu Jun 23 21:05:10 2008

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved

could not open trace file test_ora_21769.trc

In order to successfully execute TKPROF on this trace file you can use the mkfifo command to create named pipe as follow:

  • Open a new unix/linux session (1st), change directory where the trace file exists and execute:

[udump]$ mkfifo mytracepipe
[udump]$ tkprof mytracepipe test_ora_21769.out

TKPROF: Release 9.2.0.6.0 - Production on Thu Jun 23 21:07:35 2008

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

  • Open another session (2nd), change directory where the trace file exists and execute:

[udump]$ cat test_ora_21769.trc > mytracepipe

This way you'll successfully get the output file.

 

Second case - spool

Similar issue with spool to file larger than 2GB can be treat similarly.

$ mkfifo myspoolpipe.out

--> Create new named pipe called 'myspoolpipe.out'

$ dd if=myspoolpipe.out of=aviad.out &

--> What you read from 'myspoolpipe.out' write to 'aviad.out'

$ sqlplus user/pwd@dbname

SQL*Plus: Release 9.2.0.6.0 - Production on Tue Jun 24 12:05:37 2008

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

Connected to:
Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.6.0 - Production

SQL> spool myspoolpipe.out

--> Spool to the pipe

SQL> select .....

SQL> spool off
SQL> 5225309+294082 records in
5367174+1 records out

SQL> exit
Disconnected from Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.6.0 - Production

[1]+  Done                    dd if=myspoolpipe.out of=aviad.out

$ ls -ltr

prw-r--r--  1 oratest dba          0 Jun 24 12:22 myspoolpipe.out
-rw-r--r--  1 oratest dba 2747993487 Jun 24 12:22 aviad.out

Related Notes:

Note 62427.1 - 2Gb or Not 2Gb - File limits in Oracle
Note 94486.1 - How to Create a SQL*Plus Spool File Larger Than 2 GB on UNIX

Aviad


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