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The SELECT TOP clause is used to specify the number of records to return. The SELECT TOP clause is useful on large tables with thousands of records. Returning a large number of records can impact performance.
20 Μαρ 2018 · FIRST_ROWS(n) is "optimize for the first n rows using all the normal costing algorithms", whereas FIRST_ROWS is "optimizer for the first rows using a pre-defined set of rules that will force index use, nested loops, etc."
After I implemented Oracle Hint FIRST_ROW, performance become significantly better. Both statements (for both ids 1 and 2) produce return in under 1 second. SELECT /*+ FIRST_ROWS */ field1, field2, field3, ...
17 Δεκ 2012 · Guide on how to use first row sports. (live steaming)
21 Νοε 2012 · FIRST_ROWS(n) affords greater precision, because it instructs Oracle to choose the plan that returns the first n rows most efficiently. The FIRST_ROWS hint, which optimizes for the best plan to return the first single row, is retained for backward compatibility and plan stability.
