What causes high swap memory usage?

What causes high swap memory usage?

A higher percentage of swap use is normal when provisioned modules make heavy use of the disk. High swap usage may be a sign that the system is experiencing memory pressure. However, the BIG-IP system may experience high swap usage under normal operating conditions, especially in later versions.

What does Freeable memory mean?

The freeable memory includes the amount of physical memory left unused by the system plus the total amount of buffer or page cache memory that are free and available. So it’s freeable memory across the entire system.

What is swap usage in RDS?

Amazon Elastic Compute Cloud (Amazon EC2) instances that run Linux use swap memory when a system requires more memory than is allocated. For more information, see Instance Store Swap Volumes. Because most RDS DB instances use Linux (except SQL Server), your database can sometimes use swap memory.

What is Freeable memory in CloudWatch?

Freeable Memory – How much RAM is available on the DB instance, in megabytes. The red line in the Monitoring tab metrics is marked at 75% for CPU, Memory and Storage Metrics. Swap Usage – How much swap space is used by the DB instance, in megabytes.

How do I reduce swap memory usage?

To clear the swap memory on your system, you simply need to cycle off the swap. This moves all data from swap memory back into RAM. It also means that you need to be sure you have the RAM to support this operation. An easy way to do this is to run ‘free -m’ to see what is being used in swap and in RAM.

What is RDS memory?

In Amazon RDS for MySQL, you can monitor four memory statuses: Active: The memory that’s actively being consumed by database processes or threads. Free Memory: The memory that’s available for use. Cache: Caching is a technique where data is temporarily stored in memory, enabling fast retrieval of data.

How do I check the memory on my RDS?

How do I view CPU and memory usage for my Amazon Aurora DB cluster?

1. Open the Amazon RDS console.
2. Choose Databases from the navigation pane.
3. Select your DB instance.
4. Choose the Monitoring tab.
5. From the Monitoring menu, choose CloudWatch, Enhanced Monitoring, or OS process list.

How do I optimize RDS?

This Amazon RDS cost-optimization approach consists of the following key steps:

1. Tag and track resource utilization.
2. Define the utilization policies for your Amazon RDS resources.
3. Educate the owners and implement the policies.
4. Learn and optimize the policies and processes.

What to do when Amazon RDS is using swap memory?

You can also enable Performance Insights to identify the SQL and wait events that are consuming excessive swap or memory on the RDS DB instance. Performance Insights collects the data at the database level and displays that data in the Performance Insights dashboard.

Why is swap space not cleared in RDS?

Linux swap usage isn’t cleared frequently, because clearing the swap usage requires extra overhead to reallocate swap when it’s needed and when reloading pages. As a result, if swap space is used on your RDS DB instance, even if swap space was used only one time, the SwapUsage metrics don’t return to zero.

When to use swap memory in Amazon EC2?

Amazon Elastic Compute Cloud (Amazon EC2) instances that run Linux use swap memory when a system requires more memory than is allocated. For more information, see Instance Store Swap Volumes.