SQL Health Check (SQLHC) is a powerful tool provided by Oracle for diagnosing and tuning SQL statements. It helps database administrators (DBAs) identify potential performance issues and provides detailed recommendations for optimization. This blog will guide you through the process of using SQLHC, from downloading it to generating comprehensive health check reports.
SQL Health Check (SQLHC)
SQLHC
The SQLHC tool is available for download from Oracle Support. Follow these steps:
Log in to your Oracle database using the following command. Ensure you have the necessary privileges (e.g., SYS or DBA role).
SYS
DBA
sqlplus sys/password@your_database as sysdba
Find the SQL_ID of the statement you want to tune. Use the following query to locate it:
SELECT sql_id, sql_text FROM v$sql WHERE sql_text LIKE '%your_query%';
Check which Oracle Pack license your organization uses. This affects the features available in SQLHC:
Run the sqlhc.sql script with the appropriate Oracle Pack license and SQL_ID. This generates HTML reports with performance insights.
sqlhc.sql
SQL> @sqlhc.sql T g4pkmrqrqxg3b
The SQLHC script produces HTML reports with valuable information, including:
Utilizing SQLHC can significantly improve SQL performance in Oracle databases. By following the outlined steps, you can effectively use SQLHC to generate detailed health check reports, which offer actionable recommendations for SQL optimization.