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The documentation clearly describes the precedence for NLS settings: http://docs.oracle.com/cd/E11882_01/server.112/e10729/ch3globenv.htm#NLSPG188 1 (highest) Explicitly set in SQL functions 2 Set by an ALTER SESSION statement 3 Set as an environment variable 4 Specified in the initialization parameter file 5 Default ...


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Parameter sniffing means that one set of parameters produces a dramatically different execution plan than the other, and that if the wrong plan is cached, you get adverse performance effects. This answer is based on your simplified query - to get accurate advice for your query, you'll need to post the query and the two different plans that resulted from ...


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Look here for a possible answer to this question. prevent sql injection inside stored procedure But the answer there is also a follow-up question.



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