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Spotlight on Oracle 10.4 - Getting Started Guide

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Paging Activity Page

The Memory | Paging Activity page shows details of Windows paging activity and page files.

To open the Paging Activity page

  1. Select the Spotlight on Windows connection in the Spotlight Browser.
  2. Click Memory | Paging Activity.

Charts and Grid on the Paging Activity page


  • Every chart has a legend (list of symbols) to its right that describes the various series (line graphs) on the chart.
  • Click an item in the legend to highlight its series (line) in the chart. Click a second time to return the series to its normal appearance.
  • Move the mouse pointer over an item in the legend to view the current value for that series within the chart.
Charts and Grid Description
Page File Transfers Chart

The Page File Transfers chart shows recent Windows paging activity. It shows the number of pages read (in) and written (out) per second to and from the Page Files.

Paging occurs when the Windows Virtual Memory Manager moves data or code between physical memory and disk. Sustained high paging rates can degrade system performance significantly.

Page Faults Chart

The Page Faults chart shows the rate at which Windows is processing page faults. It compares the two types of page fault (soft and hard) and makes it easy to see the ratio between them.

A page fault occurs when a process references a page that is not in that processes working set (the set of pages visible to that process in physical memory). When this happens, the process has to wait while the Windows Virtual Memory Manager retrieves the page from virtual memory.

  • A soft page fault occurs when Windows finds the required page somewhere in physical memory.
  • A hard page fault occurs when the page is not in physical memory and Windows has to read it from the page files. This is by far the more expensive of the two as it involves disk I/O. Hard page faults are the cause of paging and can degrade performance significantly.
Page Files Grid

The Page Files grid shows the page files in use by Windows.

Page files are disk files that the Windows Virtual Memory Manager uses to back physical memory. Code and data is moved between physical memory and the page files as required, giving processes on the system the illusion that there is much more physical memory available than there really is. The process of moving data and code between memory and disk is called paging.

The Page Files grid shows the following:




Page File location (file name).


The page file size (MB).


The current Used space (MB) in the page file.

% Used

The current Used space as a percentage of the page file size.

Peak %

The peak percentage of space used in the specified page file.


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