How do you check the performance of an Oracle database?
By following the performance method explained in Chapter 2, “Oracle Database Performance Method”, you can drill down from the charts to identify the causes of instance-related performance issues and resolve them. To monitor user activity: From the Database Home page, click Performance. The Performance page appears.
How do you check DB Link is working or not?
We can verify public database link using select * from dual@public_db_link; How private db links can be verified by a DBA if application schema’s password is not known.
Which parameters affect the performance of Oracle DB?
Initialization Parameters. A running Oracle instance is configured using initialization parameters, which are set in the initialization parameter file. These parameters influence the behavior of the running instance, including influencing performance.
What is a DB link in Oracle?
A database link is a schema object in one database that enables you to access objects on another database. The other database need not be an Oracle Database system. After you have created a database link, you can use it to refer to tables and views on the other database.
What are metrics in Oracle?
You can monitor the health, capacity, and performance of your Oracle Cloud Infrastructure Database service resources by using metrics , alarms , and notifications. For more information, see Monitoring and Notifications. You can use metrics data to diagnose and troubleshoot problems with your Database Service resources.
Which parameters affect the performance of DB?
There are five factors that influence database performance: workload, throughput, resources, optimization, and contention.
How does a DB Link work?
A database link connection allows local users to access data on a remote database. For this connection to occur, each database in the distributed system must have a unique global database name in the network domain. The global database name uniquely identifies a database server in a distributed system.
What are DB metrics?
The Database service metrics help you measure useful quantitative data, such as CPU and storage utilization, the number of successful and failed database logon and connection attempts, database operations, SQL queries, and transactions, and so on.
How to measure the performance of an Oracle Database?
To effectively measure database performance, statistics must be available. Oracle Database generates many types of cumulative statistics for the system, sessions, segments, services, and individual SQL statements. Cumulative values for statistics are generally accessible using dynamic performance views, or V$ views.
How are performance metrics used in Oracle QoS management?
The Oracle Database QoS Management metrics are used to find a bottleneck for a Performance Class using the following steps: Oracle Database QoS Management selects the highest ranked Performance Class that is not meeting its Performance Objective. For that Performance Class, wait times for each resource are determined from the collected metrics.
What are the different types of metrics in Oracle?
Oracle Database QoS Management therefore observes and manages only wait times. There are two types of metrics used to measure the response time of work requests: performance metrics and resource metrics.
What are some of the performance issues when running SQL across a database link?
Question: What are some of the performance issues when running SQL across a database link (dblink)? Answer: Generally, the limiting factor in SQL performance of a distributed query (over a db-link) is the speed of the network (make sure that you have a high-speed network with proper SDU), but there are other issues: