Specifies the minimum percentage by which the data block (DB) size must be reduced by compression. If compression will not reduce the DB by at least this amount, the DB will not be compressed, because the overhead of having to compress and uncompress the blocks during DML operations is not worth the minimal space savings that might be achieved.
0 through 99 percent
Changes Take Effect
After the DBS Control Record has been written.
BLC enables data compression at the data block (DB) level of the Teradata Database file system. Compression reduces the amount of storage required for a given amount of data. The BlockLevelCompression field of DBS Control enables and disables BLC.
Compression is also subject to the criteria specified by the “MinDBSectsToCompress” DBS Control setting. DBs not meeting these minimum criteria will not be compressed, even if they are larger than the size specified by MinPercentCompReduction.
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COMPRESS and UNCOMPRESS commands