Log Miner in Oracle allows users to analyze redo log files to perform auditing, determine causes of errors, and aid in performance tuning and capacity planning. It requires a source and mining database running the same Oracle version with a LogMiner dictionary and redo log files. Users direct Log Miner operations using PL/SQL packages to build the dictionary, add log files, start the session, query results, and end the session.

1. Log Miner In Oracle

2. Benifits
• Pin Pointing (xtional errors)
• Auditing
• Determining what actions you would have to
take to perform
• Performance tuning and capacity planning
• Performing postauditing

3. Sample Configuration

4. Requirements
• Source and mining database
• Both the source database and the mining database
must be running on the same hardware platform.
• The mining database can be the same as, or completely
separate from, the source database.
• The mining database must run the same version or a
later version of the Oracle Database software as the
source database.
• The mining database must use the same character set
(or a superset of the character set) used by the source
database.

5. • LogMiner dictionary
• All redo log files

6. Directing LogMiner Operations and
Retrieving Data of Interest
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You direct LogMiner operations using the DBMS_LOGMNR and DBMS_LOGMNR_D PL/SQL
packages, and retrieve data of interest using the V$LOGMNR_CONTENTS view, as follows:
Specify a LogMiner dictionary.
Use the DBMS_LOGMNR_D.BUILD procedure or specify the dictionary when you start LogMiner (in
Step 3), or both, depending on the type of dictionary you plan to use.
Specify a list of redo log files for analysis.
Use the DBMS_LOGMNR.ADD_LOGFILE procedure, or direct LogMiner to create a list of log files for
analysis automatically when you start LogMiner (in Step 3).
Start LogMiner.
Use the DBMS_LOGMNR.START_LOGMNR procedure.
Request the redo data of interest.
Query the V$LOGMNR_CONTENTS view. (You must have the SELECT ANY TRANSACTION privilege to
query this view. Per email from Diana Lorentz/Doug Voss on 3/16/05)
End the LogMiner session.
Use the DBMS_LOGMNR.END_LOGMNR procedure.
You must have been granted the EXECUTE_CATALOG_ROLE role to use the LogMiner PL/SQL
packages and to query the V$LOGMNR_CONTENTS view.