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The online build works by maintaining two copies of the index simultaneously: the original (the source) and the new one (the target). The target is used only for writing any changes made while the rebuild is going on. All reading is done from the source, and modi cations are applied to the source as well. SQL Server row-level versioning is used, so anyone retrieving information from the index can read consistent data. Figure 6-3 (taken from SQL Server Books Online) illustrates the source and target, and it shows three phases that the build process goes through. For each phase, the illustration describes what kind of access is allowed, what is happening in the source and target tables, and what locks are applied. The actual processes might differ slightly depending on whether the index is being built initially or being rebuilt and whether the index is clustered or nonclustered. Here are the steps involved in rebuilding a nonclustered index: 1. A Shared lock (S-lock) is taken on the index, which prevents any data modi cation queries, and an Intent-Shared lock (IS-lock) is taken on the table. 2. The index is created with the same structures as the original and marked as write-only. 3. The Shared lock is released on the index, leaving only the Intent-Shared lock on the table. 4. A versioned scan (discussed in detail in 10) is started on the original index, which means modi cations made during the scan are ignored. The scanned data is copied to the target.

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6 Concurrent Users Source (Tables)

No concurrent user activity allowed SELECT UPDATE DELETE INSERT SELECT UPDATE DELETE INSERT SELECT UPDATE DELETE INSERT

5. All subsequent modi cations write to both the source and the target. Reads use only the source. 6. The scan of the source and copy to the target continues while normal operations are performed. SQL Server uses a proprietary method for reconciling obvious problems such as a record being deleted before the scan has inserted it into the new index. 7. The scan completes. 8. A Schema-Modi cation lock (Sch-M-lock) the strictest of all types of locks is taken to make the table completely unavailable. 9. The source index is dropped, metadata is updated, and the target index is made to be read-write. 10. The Schema-Modi cation lock is released.

Building a new nonclustered index involves exactly the same steps except there is no target index so the versioned scan is done on the base table, and write operations need to maintain only the target index rather than both indexes. A clustered index rebuild works exactly like a nonclustered rebuild, so long as there is no schema change (a change of index keys or uniqueness property). For a build of new clustered index, or a rebuild of a clustered index with a schema change, there are a few more differences. First, an intermediate mapping index is used to translate between the source and target physical structures. In addition, all existing nonclustered indexes are rebuilt one at a time after a new base table has been built. For example, creating a clustered index on a heap with two nonclustered indexes involves the following steps: 1. Create a new write-only clustered index. 2. Create a new nonclustered index based on the new clustered index. 3. Create another new nonclustered index based on the new clustered index. 4. Drop the heap and the two original nonclustered indexes. Before the operation is completed, SQL Server will be maintaining six structures at once. Online index building is not really considered a performance enhancement because an index can actually be built faster of ine, and all these structures do not need to be maintained simultaneously. Online index building is an availability feature you can rebuild indexes to remove all fragmentation or reestablish a llfactor even if your data must be fully available at all times.

Microsoft Visual C# 2008 Express Edition: Build a Program Now!

Note There are two exceptions to being able to perform online index operations:

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If the index contains a LOB column, online index operations are not available. This means that if the table contains a LOB column, the clustered index cannot be rebuilt online. Online operations are prevented only if a nonclustered index speci cally includes a LOB column. A single partition of a clustered or nonclustered index cannot be rebuilt online.

Summary