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Jump to FIRST_ROWS Hint → Description of the illustration first_rows_hint.gif The FIRST_ROWS hint instructs Oracle to … /*+ FIRST_ROWS(10) */ employee_id, last_name, salary, job_id FROM
Jump to Example 7-4 Execution Plan for SELECT with FIRST_ROWS Hint → SELECT /*+ FIRST_ROWS(25) */ employee_id, department_id FROM hr.employees WHERE department_id > 50
Jump to 7.2.2 FIRST_ROWS(n) Mode → In FIRST_ROWS(n) mode, the optimizer in Oracle Database optimizes for fast response time by having … use the FIRST_ROWS(n) hint. If you want to optimize for better
Jump to SDO_NN_DISTANCE Performance Improvement with FIRST_ROWS Hint → performance when you specify the FIRST_ROWS optimizer hint. For an example of using the FIRST_ROWS
Jump to OPTIMIZER_MODE Sets the mode of the optimizer at instance startup. The possible values are ALL_ROWS… → , FIRST_ROWS_ n, and FIRST_ROWS. For descriptions of these parameter values, see "Setting the OPTIMIZER_MODE Initialization Parameter".
Jump to 7.1.2 Improved Response Time with FIRST_ROWS(n) Hint for ORDER BY Queries → FIRST_ROWS(n) hint. You use the FIRST_ROWS(n) hint in cases where you want the first number ( n ) of … cursor to retrieve the first 10 hits of a query and uses
Jump to ALL_ROWS Hint → employee_id = 107; If you specify either the ALL_ROWS or the FIRST_ROWS hint in a SQL statement, and if … FIRST_ROWS hint, then the optimizer gives precedence
Jump to Table 11-5 Hints for Changing the Query Optimizer Goal → Hint Description FIRST_ROWS( n ) This hint instructs Oracle Database to optimize an individual SQL
Jump to 126.96.36.199 Hints for Optimization Approaches and Goals → The ALL_ROWS and FIRST_ROWS( n ) hints let you choose between optimization approaches and goals. If … statement does not affect SQL run within PL/SQL. If you specify either the
Jump to Table 3-21 Hints by Functional Category → Hint Link to Syntax and Semantics Optimization Goals and Approaches ALL_ROWS Hint FIRST_ROWS Hint
Jump to Figure 7-4 Shared Pool Check → OPTIMIZER_MODE=FIRST_ROWS; SELECT * FROM my_table; ALTER SESSION SET SQL_TRACE=TRUE; SELECT * FROM my_table
Jump to 188.8.131.52 Setting the OPTIMIZER_MODE Initialization Parameter → rows, where n equals 1, 10, 100, or 1000. FIRST_ROWS The optimizer uses a mix of cost and heuristics … plan without applying the heuristic. FIRST_ROWS is available
Jump to Use of the Optimizer → as possible. Initial response time The FIRST_ROWS hint instructs the optimizer to get the first row
Jump to OPTIMIZER_MODE → | 1000] | first_rows | all_rows } Default value all_rows Modifiable ALTER SESSION, ALTER SYSTEM … response time to return the first n rows (where n = 1, 10, 100, 1000). first_rows
Jump to 19.1 Overview of Optimizer Hints → cost: SELECT /*+ FIRST_ROWS(10) */ * FROM employees; See Also: Oracle Database SQL Language Reference
Jump to 21.6.2 Sample TKPROF Body → 0.00 0 0 0 0 Misses in library cache during parse: 1 Optimizer mode: FIRST_ROWS Parsing user id: 44 … ------- ------ -------- ---------- ---------- ---------- ---------- ----------
Jump to 7.7.9 How do I make an ORDER BY score query faster? → Answer: Sorting by relevance ( SCORE(n) ) can be extremely quick if the FIRST_ROWS(n) hint is used … tables. An example of such a query: SELECT /*+ FIRST_ROWS(10)
Jump to Initialization Parameters for Query Rewrite → : OPTIMIZER_MODE = ALL_ROWS (default), FIRST_ROWS, or FIRST_ROWS_ n With OPTIMIZER_MODE set to FIRST_ROWS, the
Jump to 4.2.9 Optimizing for Response Time → out. This example uses the FIRST_ROWS (n) hint and a cursor. declare cursor c is select … /*+ FIRST_ROWS(20) */ title, score(1) score from news where contains(txt_col,
Jump to Ensuring that Query Rewrite Takes Effect → OPTIMIZER_MODE to ALL_ROWS, FIRST_ROWS, or FIRST_ROWS_ n. If step 1 has not been completed, a