Typically when you see OLEDB waits they come from querying linked servers set up through OLEDB. If you are seeing a high number of these as a query runs, you should consider monitoring performance on the remote
An expression that does not use SARG operators does not improve performance, because the SQL Server Compact 3.5 query processor has to evaluate every row to determine whether it meets the filter clause. Therefore, an index is not useful on expressions that do not use SARG operators. Non-SARG ...
This book provides the tools you need to approach your queries with performance in mind. SQL Server Query Performance Tuning leads you through understanding the causes of poor performance, how to identify them, and how to fix them. You’ll learn to be proactive in establishing performance ...
Grant Fritchey’s book SQL Server 2012 Query Performance Tuning is the answer to your SQL Server query performance problems. The book is revised to cover the very latest in performance optimization features and techniques. It is current with SQL Server 2012. It provides the tools you need to ...
Upgrades to SQL Server—especially to the optimizer, which helps determine how a query is executed, and the query engine, which executes the query—lead to better performance all on their own. The beauty of query performance tuning is that, in many cases, a small change to an index or a...
Avoid using the SQL Server 2000 sql_variant datatype. Besides being being a performance hog, it significantly affects what you can do with the data stored as a sql_variant. For example, sql_variant columns cannot be a part of primary or foreign keys, can be used in indexes and unique ke...
SQL Server Compact 3.5 stores data in 4 Kb pages. The page count can be approximated by using the following formula, although the actual count might be slightly larger because of the storage engine overhead. <sum of sizes of columns in bytes> * <# of rows> ...
Benefits of SQL Server Tuning Tools While SQL query tuning can be done manually, it’s a complicated and time-consuming process, which is why using SQL tuning tools can allow database administrators to more efficiently maximize the performance of their servers and databases. SQL query performance...
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SQL query performance tuning with I/O statistics and execution plans How to analyze query performance characteristics in SQL Server Best practices The more filters in the Where clause the better. Simply because the more filters we put in is less data that SQL Server will return. You’ve seen ...