how to monitor database performance

During standard workload hours, the value should not exceed the warning threshold (shown in yellow). Under Detail for Selected 5 Minute Interval, select Top PL/SQL from the View list. In a smoothly running set of primary and secondary nodes (referred to as a “replica set”), the secondaries quickly copy changes on the primary, replicating each group of operations from the oplog as fast as they occur (or as close as possible).

This chapter contains the following sections: Customizing the Database Performance Page.

Locate the spikes in the Average Active Sessions chart. Database metrics monitor the performance of the database itself. The Throughput charts are shown with Instance Throughput Rate set to the default value of Per Second. Locate the spikes in the Average Active Sessions chart. Verify the current disk I/O utilization using the Disk I/O Utilization chart. The number of transactions per second has remained between 1000 and 2000 for 25 minutes. This page contains I/O service time statistics and related alerts generated over the last 24 hours. The I/O Megabytes per Second and I/O Requests per Second charts appear. Values that use a larger block of active sessions represent bottlenecks caused by a particular wait class, as indicated by the corresponding color in the legend. In the example shown in Figure 4-5, the SQL*Plus session for user sh is consuming over 96% of database activity and should be investigated.

In the example shown in Figure 4-12, the wait times are all associated with I/O for the file in the SYSTEM tablespace. For example, when a user starts SQL*Plus, the user must provide a valid database user name and password to establish a session. If you are running a single “mongod” instance, it shows you the statistics for that single instance. This data is available from the Active Sessions Waiting: User I/O page. In the example in shown in Figure 4-15, the number of transactions and physical reads per second spiked at around 10:45 a.m. A client can be a Web browser or any end-user process that initiates requests for an operation to be performed on the database. These requests and transactions don’t happen sequentially or in a rational order.
You can customize the Performance page so that it specifically addresses your requirements. The I/O wait time for a database process represents the amount of time that the process could have been doing useful work if a pending I/O had completed. All the per-second metrics are relative to your server’s configuration, as well as the cluster architecture.

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