Identify the missing word(s) in the following sentence within the context of Microsoft Azure. The path most DBAs take to troubleshoot query performance is to first identify the problematic query (typically the query consuming the highest amount of system resources), and then retrieve that query’s execution plan. There are two scenarios. The query consistently performs poorly. The query performs well for some executions, but not others. The term [?] in relational databases refers to a predicate ( WHERE clause) in a specific format that can leverage an index to speed up execution of a query. In SQL Server, using this means that the optimizer will evaluate using a nonclustered index on the column referenced in the search argument for a SEEK operation, instead of scanning the entire index (or the entire table) to retrieve a value. The presence of a search argument does not guarantee the use of an index for a SEEK . The optimizer’s costing algorithms could still determine that the index was too expensive.