One strategy I've successfully used to reduce space is to make use of codes in character variables which are expanded to full descriptions using SAS formats (eg store USA in a character variable and have a SAS format which applies United States of America).
Also if you want to compress numeric variables that are just codes that aren't used in calculations, convert them to character.
Please note that even when you are able to compress LASR tables, in my experience the performance degradation is significant.
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