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How do you increase swap usage?
Here are the steps required to increase the amount of swap space in an LVM environment:
- Turn off all swap.
- Increase the size of the logical volume designated for swap.
- Configure the resized volume as swap space.
- Turn on swap.
What is Oracle Coherence used for?
Oracle Coherence is the industry leading in-memory data grid solution that enables organizations to predictably scale mission-critical applications by providing fast access to frequently used data.
What do you know about cache coherence?
Cache coherence refers to the problem of keeping the data in these caches consistent. The main problem is dealing with writes by a processor. There are two general strategies for dealing with writes to a cache: Write-through – all data written to the cache is also written to memory at the same time.
Why is swap usage so high in Oracle?
This coupled with a default high value of vm.swappiness often resulted unnecessarily high memory usage and swapping. filesystemio_options should be set to setall, and it is recommended to decrease vm.swappinness from the default 60/30 value (RHEL6/RHEL7). It is common knowledge that Oracle databases allocate memory for PGA and SGA.
How does swapping affect the performance of coherence?
Swapping, also known as paging, is the use of secondary storage to store and retrieve application data for use in RAM memory. Swapping is automatically performed by the operating system and typically occurs when the available RAM memory is depleted. Swapping can have a significant impact on Coherence’s performance and should be avoided.
How to identify which processes use swap memory in Oracle?
Currently it shows above 80% in Enterprise Manager. How do I identify which processes use swap memory in Oracle and how do I reduce it? Oracle database is a database server and not an operating system, it does not know about virtual memory management and swap usage.
How to change the log level in coherence Oracle?
The default log level is 5. -1 – No log messages are emitted. To change the log level, edit the operational override file and add a element, within the element, that includes the level number. For example: