Useful tips

How do I tune an Oracle SQL statement?

How do I tune an Oracle SQL statement?

  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 would you tune a SQL query?

Supercharge Your SQL Queries for Production Databases

  1. Define business requirements first.
  2. SELECT fields instead of using SELECT *
  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.
  7. Use LIMIT to sample query results.

How do I tune a query in SQL Developer?

To use the SQL Tuning Advisor from Oracle SQL Developer, you must perform the following steps:

  1. Install Oracle SQL Developer locally, and create a cloud connection from Oracle SQL Developer to your Exadata Express service.
  2. Write the SQL query to be analyzed in the SQL Worksheet, and click the SQL Tuning Advisor…

Is there automatic SQL tuning in Oracle 10g?

This article the discusses the new features which automate the tuning of SQL statements in Oracle 10g. This functionality requires Enterprise Edition and the Diagnostics and Tuning option. Make sure you have the correct licensing before using this functionality. Related articles. Adaptive Query Optimization in Oracle Database 12c (12.1 and 12.2)

When to tune PL / SQL applications for performance?

With the many performance improvements in Oracle Database 10 g, any code from earlier releases is a candidate for tuning. Any program that spends a lot of time doing PL/SQL processing, as opposed to issuing DDL statements like CREATE TABLE that are just passed directly to SQL. You will want to investigate native compilation.

Where do I find the tuning task in Oracle?

The first step when using the SQL tuning advisor is to create a new tuning task using the CREATE_TUNING_TASK function. The statements to be analyzed can be retrieved from the Automatic Workload Repository (AWR), the cursor cache, a SQL tuning set or specified manually.

Why is PL / SQL in Oracle 10 g so slow?

PL/SQL in Oracle Database 10 g includes many automatic optimizations, so you might see performance improvements without doing any tuning. When a PL/SQL-based application performs poorly, it is often due to badly written SQL statements, poor programming practices, inattention to PL/SQL basics, or misuse of shared memory.