What Is a Partitioned Indexes in Microsoft SQL Server?
An index can align with table partitions or partition independently, supporting elimination and partition-level maintenance.
How the Partitioned Indexes Algorithm Works
An index can align with table partitions or partition independently, supporting elimination and partition-level maintenance.
When to Use Partitioned Indexes
Large tables with lifecycle operations and queries filtered by the partitioning key.
How to Create a Microsoft SQL Server Partitioned Indexes
Review data quality, existing structures, feature support, build time, and deployment requirements before creating an index on a production table.
CREATE PARTITION FUNCTION pf_SaleDate (date) AS RANGE RIGHT FOR VALUES ('2026-01-01', '2027-01-01');Partitioned Indexes Query Example
This example demonstrates the matching query shape. Check the execution plan to confirm that the engine can use the index.
SELECT SaleId FROM dbo.Sales WHERE SaleDate >= '2026-01-01' AND SaleDate < '2027-01-01';Queries Supported by Partitioned Indexes
Large tables with lifecycle operations and queries filtered by the partitioning key. A similar-looking predicate may not use the same access path; operators, expressions, key order, and data type all matter.
Read Performance, Storage, and Write Costs
Does not replace a selective key; aligned and nonaligned indexes have different maintenance behavior. Indexes reduce some search work but require storage and add maintenance to writes.
Partitioned Indexes Limitations and Common Mistakes
Unique indexes on partitioned tables often need the partitioning key. Check alignment rules for the release.
Do not assume that an index being present means the optimizer chose it or that the query became selective.
How to Measure and Tune Partitioned Indexes
Confirm partition elimination and plan switch, rebuild, and statistics operations.
Compare representative plans and timings before and after, including concurrent writes and realistic data volumes.
Partitioned Indexes Questions
Will the database always use this index?
No. The optimizer weighs selectivity, estimated costs, statistics, cache state, and the amount of data returned.
What should I verify before production?
Confirm version support, query compatibility, write overhead, build/rollback procedures, and index behavior during backup and recovery.
Official Microsoft SQL Server Index Documentation
Check Microsoft Learn: SQL Server Indexes for release-specific requirements and supported operators.