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What circumstances we use ALL_ROWS and what circumstances we use FIRST_ROWS optimizer mode? This article is written in oracle9i.
First_rows attempts to optimize the query to get the very first row back to the client as fast as possible. This is good for an interactive client server environment wher ......
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CREATE TABLE T(ID INTEGER);
CREATE VIEW V1 AS SELECT * from T;
CREATE VIEW V2 AS SELECT * from T WITH READ ONLY;
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INSERT INTO V1 VALUES(1);
--------------------
1 row cre ......