Try to calculate the size of the PAGE file

This is an academic exercise. I am trying to determine why my PAGE file size is what it is. Currently, he is registered to 28,000,331 bytes. (He's alone). Here are the facts:

3 dense dimensions, stored members are 17 * 20 * 5, for a total of 1,700 * 8 = 13 600 bytes.

The actual maximum blocks are 19 800. The maximum reported are 24 750.

I have disabled compression for ease of calculation.

There is only 1 block no missing.

I use SER60 as my guide in the section estimate disk and the memory required. However, when I use the planned calculation:

Number of blocks * (size of data block expanded + 72 bytes)

I don't get anywhere near the number of bytes listed for the PAG file. I realize that I am not to mention the rest of the database files and do not know if this calculation is only for the PAG files or all files. I am not very interested in the size of the entire database, just the file PAG. So my questions are:

1. is the calculation provided for all files or just the file PAG?

2. If the answer to 1 is Yes, is there a separate calculation, that I can use to determine the size of the PAGE file only?

Take a look at NUMBLOCKSTOEXTEND in the technical reference on Essbase.  We had a long conversation that addressed this issue on Network54 recently: http://www.network54.com/Forum/58296/thread/1374608752/11-1-2-2+Fragmentation

Short answer is that Essbase allocates file space .pag in 2048-block pieces, which is the default value of NUMBLOCKSTOEXTEND 11.1.2.2.  Calculate how many blocks (including header block 72 bytes) integrate 28,000,331 bytes and you will see that this is almost exactly 2048.

With compression on it more difficult (for me, at least) to understand how Essbase arrives with the size of the average disk blocks to use as the size on the disk with compression on is not constant.

Tags: Business Intelligence

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