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Don Burleson Blog 








Enhanced SQL trace utility from Oracle

Oracle Tips by Burleson Consulting

Here is a great new script from Carlos Sierra, a brilliant developer at Oracle Corporation.  This script is an enhancement to the Center of Excellence (COE) script top produce a super-detailed trace of SQL execution.  This new script is remarkable, and I hope that you enjoy it as much as I do.  The MOSC page is reproduced here with Mr. Sierra's permission:

I have reproduced it below for your convenience (see below).  Carlos' script enhances standard execution plan analysis by providing:

  1. Enhanced Explain Plan (including execution order, indexed columns, rows count and blocks for tables);

  2. Schema Object Attributes for all Tables and Indexes accessed by the SQL statement being diagnosed (including: object dependencies, tables, indexes, columns, partitions, sub-partitions, synonyms, policies, triggers and constraints);

  3. CBO Statistics (for levels: table, index, partition, sub-partition and column);

  4. Histograms (includes table, partition and sub-partition levels);

  5. Space utilization and administration (for tables, indexes, partitions and sub-partitions);

  6. Objects, Segments, Extents, Tablespaces and Datafiles (including current performance of datafiles);

  7. RDBMS Initialization Parameters INIT.ORA (required, recommended and default for an APPS 11i database, and all other parameters SET on the INIT.ORA file);

  8. Source Code in which the SQL Statement and accessed Tables depend on (Triggers description and body, Views columns and text, Packages specs and bodies, Procedures and Functions).

SQLTXPLAIN.SQL - Enhanced Explain Plan and related diagnostic info for one SQL statement (8.1.5-9.2.0)

SQLTXPLAIN.SQL is one SQL*Plus script that using a small staging repository and a PL/SQL package creates a comprehensive report to gather relevant information on ONE SQL statement (sql.txt).  COE_XPLAIN.SQL performs the same functionality, with some limitations and restrictions.

SQLTXPLAIN.SQL differs from COE_XPLAIN.SQL in the following ways:

  1. SQLTXPLAIN.SQL collects more data about the objects in which the SQL Statement <sql.txt> depends on.  It uses V$OBJECT_DEPENDENCY to find these dependencies.

  2. SQLTXPLAIN.SQL can be used by multiple users concurrently.  It keeps all staging data organized by unique STATEMENT_ID, therefore it can handle concurrency and historical data.

  3. SQLTXPLAIN.SQL creates a better organized and documented report output.  Report sections that are not needed on a specific SQL Statement <sql.txt> are just skipped over in the new report without any headers or references.

  4. SQLTXPLAIN.SQL allows to keep multiple versions of CBO Stats into the same table SQLT$STATTAB.  Therefore, similar sets of CBO Stats can be restored into the Data Dictionary multiple times during a SQL Tuning exercise (without loosing original Stats).

  5. SQLTXPLAIN.SQL is subject to future improvements and additions, while COE_XPLAIN.SQL is not.

  6. SQLTXPLAIN.SQL performs better than COE_XPLAIN.SQL for same SQL Statement <sql.txt>.

  7. SQLTXPLAIN.SQL reports sup-partitions details.

  8. SQLTXPLAIN.SQL reports actual LOW and HIGH 'boiled' values of all columns on tables being accessed.  It also reports Histograms in a more comprehensive format.

  9. SQLTXPLAIN.SQL does not report some data shown on COE_XPLAIN.SQL that was actually not used during SQL Tuning exercises, making the new report easier to understand.

  10. COE_XPLAIN.SQL evolved during 2 years, while SQLTXPLAIN.SQL was designed from scratch.

Get the Complete
Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.



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