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Wednesday, January 23, 2013. Cylinders in AMP making space for more data. We need to note that. Is an expensive operation on the system and it should be planned out so no parallel activities are run. Running PACKDISK on regular basis is part of Best Teradata practices. It also helps improve ov er all. Performance of the system .

Monday, April 15, 2013. Can you compress a column which is already present in table using ALTER? Can you compress a column which is already present in table using ALTER? No, We cannot use ALTER command to compress the existing columns in the table. A new table structure has to be created which includes the Compression values and data should be inserted into Compress column table. Please note - ALTER can be used only to add new columns with compression values to table. Sunday, November 4, 2012.