AIX paging space management (from-Oracle large-scale database systems on AIX/Unix)

There is a special logical volume in Aix called "Page feed space ". The traditional UNIX name of the paging space is "swap zone", and Aix manages it as a logical volume.

When the amount of available memory in the system is reduced to a certain extent, AIX memory SchedulingProgram(Vmm, Virtual Memory Manager) will
Move from the physical memory to the page feed space to release the memory and support other processes. Therefore, we can understand that the main function of the page feed space is physical memory.
Provide a buffer on the hard disk-extend the system memory. During the operation of the production system, the program and data are constantly carried out between the hard disk, the paging space, and the memory.
Page in and page out operations.

After the operating system is installed, the system generates a default paging Space named hd6. you can use the following command to list
The status of the logical volume.

# LSPs-

In aixzhong, you can use the following page feed Space Operation commands:
CHPs command: Modify the attributes of the page feed Space
LSPs command: display the attributes and current usage status of the page feed Space
Mkps command: Create a new page feed Space
RMPs command: delete a disabled page feed.
Swapon and swapoff commands: activate or disable additional page feed Space

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Generic Method for Maintaining Virtual Memory Management in a paging space-based operating system. This concept exists in all UNIX and Linux operating systems. Even in Windows
There is also the concept of "page files", that is, swap areas. Its usage is basically the same, that is, extended memory.

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