How do you perform a query tuning?

It’s vital you optimize your queries for minimum impact on database performance.

1. Define business requirements first.
2. SELECT fields instead of using SELECT *
3. Avoid SELECT DISTINCT.
4. Create joins with INNER JOIN (not WHERE)
5. Use WHERE instead of HAVING to define filters.
6. Use wildcards at the end of a phrase only.

How do I perform a performance tune in Oracle?

1. Instance Tuning Steps. Define the Problem. Examine the Host System.
2. Interpreting Oracle Database Statistics. Examine Load.
3. Wait Events Statistics. buffer busy waits.
4. Real-Time SQL Monitoring. SQL Plan Monitoring.
5. Tuning Instance Recovery Performance: Fast-Start Fault Recovery. About Instance Recovery.

How do I tune a query in SQL Developer?

2 Answers

1. Run the explain plan the regular query-based way and do not rely on tools that “help”.
2. Run the actual query you need to tune.
3. Post the execution plan.

How do I troubleshoot SQL query performance in Oracle?

Step by Step: How to troubleshoot a slow running query in Oracle

1. Step 1 – Find the SQL_ID of the slow running query.
2. Step 2 – Run the SQL Tuning advisor for that SQL_ID.
3. Step 3 – Check the sql plan hash value and pin the good plan:

How do I see query performance in SQL Developer?

In SQL Developer, you can look at the Explain Plan (or Execution Plan) by going into the Worksheet window (where the SQL query is written). Open your query there, or write the query you want to analyse. Now, click Explain Plan, or press F10. The execution plan is shown in SQL Developer.

How do I run SQL Tuning Advisor in Oracle 12c manually?

1. Simulate the issue. Get the SQLID for running SQL. Run the SQL Advisor Manually.
2. Step 1: Simulate the issue.
3. Step 2: Get the SQLID for running SQL.
4. 3: Run the SQL Advisor Manually. I.
5. II. Check the status.
6. III. Execute your SQL Tuning task.
7. IV. Check the status again.
8. Step 4: Review the recommendations by SQL Tuning Advisor.

What is SQL Tuning Advisor in Oracle?

The SQL Tuning Advisor provides advice in the form of precise SQL actions for tuning the SQL statements along with their expected performance benefits. Oracle Database can automatically tune SQL statements by identifying problematic SQL statements and implementing tuning recommendations using the SQL Tuning Advisor.

How can I speed up SQL query?

How To Speed Up SQL Queries

1. Use column names instead of SELECT *
2. Avoid Nested Queries & Views.
3. Use IN predicate while querying Indexed columns.
4. Do pre-staging.
5. Use temp tables.
6. Use CASE instead of UPDATE.
7. Avoid using GUID.
8. Avoid using OR in JOINS.