Question about compression in essbase ASO

I have a few questions about to define a dimension of compression in Essbase ASO apps:-

1. is it a good idea to have the size of compressor in app Essbase ASO.

2. I read somewhere that said it would not be good idea to have the compression period dimension where months YTD neighbourhoods and quarters of the year. So should we put compression on any other dimension dynamic calc and roll ups and have less none of level 0 members stored.

3. I have observed that when we level 0 export from an ASO application with compressed size vs ASO application with no compressed dimension, there is a difference in size of data export file. I'm not able to understand why it is so. I understand the difference between the size of data (.dat file) between Tablet app vs app uncompressed file, but do not understand the difference when the data is exported to a .txt file.

Thank you

(1) compression dimension is not mandatory, but it contributes to the performance. The compression dimension is a dynamic dimension. We need the column headers in a data load file. Ideal compression is achieved if the number of leaf-level members are divisible by 16.

(2) ASO tuning is an art as much as a science.  The best choice depends on the distribution of data in the database.  and it's different in each database.  Read all the information and then test the various options.  Try it with time as the compression and then try with the next best dynamic dimension defined as dimension of compression.  I've linked a doc tuning which is version 7, but has a very detailed discussion of the dimensions of compression.

http://www.Oracle.com/technetwork/middleware/bi-Foundation/4822-tuning-Essbase-ASO-WP-133014.PDF

(3) the format of the header (layout) of the export may be different when you use compression vs when you are not using compression.  It will certainly be different if you use another dimension for compression.  I expect the size of the file to edit when the compression setting is changed.

Tags: Business Intelligence

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