Monday, May 14, 2018

What is Compression Unit?

What is Compression Unit?


Hybrid Columnar Compression uses a logical construct called a compression unit (CU) to store a set of rows. When you load data into a table, the database stores groups of rows in columnar format, with the values for each column stored and compressed together. After the database has compressed the column data for a set of rows, the database fits the data into the compression unit.

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