Microsoft development team has been stated that Columnstore
indexes can achieve up to 100x better performance on analytics and data
warehousing workloads and up to 10x better data compression than traditional
rowstore indexes. Columnstore indexes reduce IO and optimize in-memory
operations through high data compression, columnstore elimination, rowgroup
elimination, and batch processing.
ColumnStore index is one of the best features in
SQL Server 2016. Before introducing this, all indexes have B-Tree structures
which use rowstore for the data storage but
ColumnStore indexes use both types (rowstore and columnstore) of data storage.
How does
Data Storage work?
There are two compression techniques for data
storages such as columnstore and rowstore which are used to reduce the IO
required to execute analytics queries and therefore improve query performance.
Columnstore
Data Storage
– In this storage, data is logically organized as a table with rows and columns
but physically stored in a column-wise data format.
A columnstore index physically stores most of
the data in columnstore format. In columnstore format, the data is compressed
and uncompressed as columns.
There is no need to uncompress other values in
each row that are not requested by the query. This makes it fast to scan an
entire column of a large table.
Rowstore
Data Storage -
rowstore is data that is logically organized as a table with rows and
columns, and then physically stored in a row-wise data format. This has been
the traditional way to store relational table data such as a heap or clustered
B-Tree index.
A columnstore index also physically stores some
rows in a rowstore format called a deltastore. The deltastore, also called
delta rowgroups, is a holding place for rows that are too few in number to
qualify for compression into the columnstore. Each delta rowgroup is
implemented as a clustered B-Tree index.
A deltastore is a
holding place for rows that are too few in number to be compressed into the
columnstore. The deltastore is a rowstore.
References: https://msdn.microsoft.com/en-us/library/mt793289.aspx
Wow, Terrific Post, this article cleared my confusion specifically regarding the DeltaStore concept.
ReplyDeleteThank you.
Just be aware when you disable all indexes on a table you will disable also clustered index, then you cannot insert in that table.
ReplyDeleteI have made a sql script that will disable non clustered indexes.
Will post later.
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