Abstract: Systems and methods include reception of an instruction to perform a consistency check on compressed column data. In response to the instruction, a compression algorithm applied to uncompressed column data to generate the compressed column data is determined, one or more consistency checks associated with the compression algorithm are determined, wherein a first one or more consistency checks associated with a first compression algorithm are different from a second one or more consistency checks associated with a second compression algorithm, the one or more consistency checks are executed on the compressed column data, and, if the one or more consistency checks are not satisfied, a notification is transmitted to a user.

Abstract: Systems and methods include reception of an instruction to perform a consistency check on compressed column data. In response to the instruction, a compression algorithm applied to uncompressed column data to generate the compressed column data is determined, one or more consistency checks associated with the compression algorithm are determined, wherein a first one or more consistency checks associated with a first compression algorithm are different from a second one or more consistency checks associated with a second compression algorithm, the one or more consistency checks are executed on the compressed column data, and, if the one or more consistency checks are not satisfied, a notification is transmitted to a user.

Abstract: A system includes application of respective compression types to first data associated with each of a plurality of columns to generate compressed column data, determination of a first compression ratio for each of the plurality of columns based on the compressed column data, storage of the determined first compression ratios, application, for each of the plurality of columns, of the determined compression type to second data associated with the column to generate second compressed column data, determination of a second compression ratio for each of the plurality of columns based on the second compressed column data, determination of a value for each column based on the stored first compression ratio and the second compression ratio determined for the column, determination of a representative value of the determined values, and determination, based on the representative value, whether to re-determine a compression type for each of the plurality of columns.

Abstract: A system includes application of respective compression types to first data associated with each of a plurality of columns to generate compressed column data, determination of a first compression ratio for each of the plurality of columns based on the compressed column data, storage of the determined first compression ratios, application, for each of the plurality of columns, of the determined compression type to second data associated with the column to generate second compressed column data, determination of a second compression ratio for each of the plurality of columns based on the second compressed column data, determination of a value for each column based on the stored first compression ratio and the second compression ratio determined for the column, determination of a representative value of the determined values, and determination, based on the representative value, whether to re-determine a compression type for each of the plurality of columns.