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SAP Knowledge Base Article - PreviewSymptom
The performance of a query is unstable. Sometimes the response is fast, but sometimes it is slow. When analyzing the execution plan, SQL Server optimizer prefers to use a cluster index seek (table scan) even though there is a secondary index (non-clustered) whose columns fits the query perfectly.
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Environment
SAP systems based on Microsoft SQL Server.
Keywords
Performance issue, Slow, undistributed, different, High I/O cost, SWWWIHEAD, CV04N , KBA , BC-DB-MSS , SQL Server in SAP NetWeaver Products , Problem
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