Incremental Update Sql
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We have a large partitioned SQL Server database utilizing incremental statistics. All of the indexes are partitioned aligned. When we try to rebuild a partition online by partition all of the statistics disappear after the index is rebuilt.Below is a script to replicate the issue in SQL Server 2014 with the AdventureWorks2014 database. Not sure if it's a bug, per se but it's definitely an interesting occurrence. Online partition rebuilds are new in SQL Server 2014 so there may be some internals to sort through with this.Here's my best explanation for you.
How To Update A Column With Auto Increment In Sql Server
Incremental statistics absolutely require that all partitions be sampled at the same rate so that when the engine merges the stats pages it can be confident that the sampled distribution is comparable. REBUILD necessarily samples data at a 100% sample rate. There's no guarantee that the 100% sample rate on partition 9 is always going to be the exact sample rate of the rest of the partitions. Because of this, it appears as though the engine cannot merge the samples and you end up with an empty stats blob. However, the statistics object is still there: selectchecktime = sysdatetime,schemaname = sh.name,tablename = t.name,statname = s.name,indexname = i.name,statscolumn = indexcol(quotename(sh.name)+'.'