How to Tag your Session Trace file Name

-

How to Tag your Session’s Trace file Name

Oracle server has been provided with the power of Instrumented Code. With this power you can get diagnostic as well as performance related information out of the server as required. One of the ways to get that information is by the use of trace files.

There is a way to “tag” your trace file so that you can find it even if you are not permitted access to V$PROCESS and V$SESSION. Assuming you have access to read the user_dump_dest directory, you can use the session parameter tracefile_identifier. With this, you can add a uniquely identifiable string to the trace file name, for example:

SQL Prompt> connect / as sysdba
Connected.

SQL Prompt > alter session set tracefile_identifier = ‘I_am_tcfile’;
Session altered.

SQL Prompt > alter session set sql_trace=true;

You can now go to the trace file directory (say USER_DUMP_DEST, assuming you are using dedicated server mode), and you will see a trace file like:

(USER_DUMP_DEST)/mynewdb_ora_3352_I_am_tcfile.trc

You can see, the trace file is now named in the standard <ORACLE_SID>_ora_<SERVER_PROCESS_ID> format, but it also has the unique string we specified associated with it, making it easy to find “our” trace file name.

Note:

You will not see the trace file with that name in the trace directory until you enable tracing in that session with one of the tracing method enabled. Till then no file will exist.
As soon as tracing is enabled, however, you will be able to see it.

You can check the contents of the trace file to make sure that you are looking at correct trace file. Like the file will contain the statements/queries for which you had enabled the tracing or Oracle instance name.

Comments

Post a Comment

Back To Top

Popular posts from this blog

error 18 at 0 depth lookup: self signed certificate

-
I was trying to test SSL connection between MySQL client and server. For that I created SSL certificate and keys by following the MySQL documentation at: Creating SSL Certificates and Keys Using openssl After finishing up all the commands when I verify the certificates by using: openssl verify -CAfile ca.pem server-cert.pem client-cert.pem I got the following output: error 18 at 0 depth lookup : self signed certificate error server-cert.pem: verification failed client-cert.pem: OK  Reason : The Common Name value used for the server and client certificates/keys must each differ from the Common Name value used for the CA certificate. Otherwise, the certificate and key files will not work for servers compiled using OpenSSL. Solution : When OpenSSL prompts you for the Common Name for each certificate, use different names. Common Name (e.g. server FQDN or YOUR name) []: I used values as follows: CA Cert:  ssl-ca-cert Server Cert: ssl-ca-server-cert Client Cer...
Read more

How to check fragmentation in MySQL tables

-
MySQL tables, including MyISAM and InnoDB, two of the most common types, experience fragmentation as data is inserted, updated and deleted randomly. Fragmentation can leave large holes in your table, blocks which must be read when scanning the table. Optimizing your table can therefore make full table scans and range scans more efficient. We will mention how to check fragmentation in MySQL tables using SQL queries. USE < put_your_dbname_here > SELECT TABLE_NAME, CONCAT(ROUND(( data_length + index_length ) / ( 1024 * 1024 ), 2), 'M') TOTAL_SIZE, CONCAT(ROUND(( DATA_FREE ) / ( 1024 * 1024 ), 2), 'M') DATA_FREE FROM information_schema.TABLES where table_schema = database() and ROUND(( DATA_FREE ) / ( 1024 * 1024 ), 2) > 0.00 ORDER BY DATA_FREE DESC; SELECT TABLE_NAME, ROUND(((Data_length - (TABLE_ROWS * Avg_row_length))/Data_length) * 100, 2) FRAG_Percent FROM information_schema.TABLES where table_schema = database() and TABLE_ROWS > 0 ...
Read more

How to Drop or Remove or Decommission a Database in Oracle

-
How to Drop or Remove or Decommission a Database in Oracle Database Decommission steps for Oracle 10G and 11g databases Note: ~~~~~~~~ Every organization has its own documented way of removing or decommissioning the active/running database that is supporting an Enterprise’s Application. Here I am presenting some general steps which may coincide with your organization’s standard operation procedure (SOP). 1)   Please get the required approval from Business/Customer to proceed for database decommissioning. 2)   Send the Notification to Business/Customer that we are going to decommission the database. (if required) 3)   Raise a Request for Storage and Backup team to take the required backup (provide all the details in the raised request) and to keep the Backup for a specified period of time, say for next 2 years, (That is called the backup retention period). Retention Period may be varied based on your business needs and SLA. The backup can...
Read more