Replication indexes

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Replication indexes

Chaitanya Kiran 841

In transactional replication, CREATE INDEX, DROP INDEX, ALTER INDEX, REBUILD INDEX are NOT replicated to the subscriber, correct?

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Answer 1

Marcin Policht 92,630 MVP Volunteer Moderator

You’re correct — in SQL Server transactional replication, index operations (CREATE INDEX, DROP INDEX, ALTER INDEX, REBUILD INDEX, etc.) are not replicated to the subscribers.

Transactional replication replicates data changes (DML) and, if configured, some schema changes (DDL). Replication ignores non-clustered index changes because indexes are considered performance/physical design objects, not part of the logical schema needed for replication. The clustered index is implicitly replicated since it defines the table’s storage structure (e.g., if the publisher table has a clustered PK, that’s part of the schema).

For nonclustered indexes, if you want them on the subscriber, you must:

Create them manually, or
Script them during the initial snapshot (by including indexed objects in your snapshot pre/post scripts).

This is by design. Microsoft lets you tune subscriber indexes independently for reporting/offloading scenarios, rather than forcing the same indexing strategy as the publisher.

If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

hth

Marcin

Chaitanya Kiran 841 Reputation points

2025-09-12T05:40:01.3533333+00:00

So, if we alter a non-clustered index, rebuild a non clustered index, they are not replicated to subscriber, am I correct?
Chaitanya Kiran 841 Reputation points

2025-09-15T14:11:00.5666667+00:00

So, if we alter a non-clustered index, rebuild a non clustered index, they are not replicated to subscriber, but altering or rebuilding a clustered index will be replicted to subscriber. Am I correct?
Marcin Policht 92,630 Reputation points MVP Volunteer Moderator

2025-09-15T16:18:56.01+00:00
Not quite — here's the distinction:

Clustered and nonclustered index operations (CREATE, DROP, ALTER, REBUILD) are not replicated in transactional replication.

The only reason a clustered index shows up at the subscriber is because it's part of the initial table definition delivered in the snapshot (if the table has a clustered PK or clustered unique constraint). After that, any later changes to that clustered index at the publisher are not propagated to subscribers.

So nonclustered index changes are not replicated. Clustered index changes are only applied initially (as part of table creation), but subsequent ALTER/REBUILD/DROP/CREATE operations are not replicated. This allows you to tune both clustered and nonclustered indexes independently at the subscriber for workload optimization.

If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.

hth

Marcin

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