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Database Administration

46 PART 1 Database Administration
Columnstore Index Support and SQL Server 2012
Columnstore indexes and batch-query execution mode are deeply integrated in SQL Server 2012, and
they work in conjunction with many of the Database Engine features found in SQL Server 2012. For
example, database administrators can implement a columnstore index on a table and still successfully
use AlwaysOn Availability Groups (AG), AlwaysOn failover cluster instances (FCI), database mirroring,
log shipping, and SQL Server Management Studio administration tools. Here are the common
data types supported by columnstore indexes:
¦¦ char and varchar
¦¦ All Integer types (int, bigint, smallint, and tinyint)
¦¦ real and float
¦¦ string
¦¦ money and small money
¦¦ All date, time, and DateTime types, with one exception (datetimeoffset with precision greater
than 2)
¦¦ Decimal and numeric with precision less than or equal to 18 (that is, with less than or exactly
18 digits)
¦¦ Only one columnstore index can be created per table.
Columnstore Index Restrictions
Although columnstore indexes work with the majority of the data types, components, and features
found in SQL Server 2012, columnstore indexes have the following restrictions and cannot be
in the following situations:
¦¦ You can enable PAGE or ROW compression on the base table, but you cannot enable PAGE or
ROW compression on the columnstore index.
¦¦ Tables and columns cannot participate in a replication topology.
¦¦ Tables and columns using Change Data Capture are unable to participate in a columnstore
¦¦ Create Index: You cannot create a columnstore index on the following data types:
• decimal greater than 18 digits
• binary and varbinary

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