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Top Forums Programming Oracle 11g optimizer best join order question Post 302962826 by durden_tyler on Friday 18th of December 2015 08:29:48 PM
Old 12-18-2015
Mathematically, the total number of permutations for joining 9 tables would be 9! or 362880.
However, the parameters - optimizer_max_permutations and optimizer_search_limit are undocumented (deprecated) in Oracle version 10g and higher.

Oracle hasn't mentioned or documented the algorithm it uses to derive the value, so I wouldn't rely too much on that number.

Besides, since they are deprecated: (a) use them at your own risk and (b) Oracle will not provide any support in case you run into problems using them.

Last edited by durden_tyler; 12-18-2015 at 11:47 PM..
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MAX(3)									 1								    MAX(3)

max - Find highest value

SYNOPSIS
mixed max (array $values) DESCRIPTION
mixed max (mixed $value1, mixed $value2, [mixed $...]) If the first and only parameter is an array, max(3) returns the highest value in that array. If at least two parameters are provided, max(3) returns the biggest of these values. Note Values of different types will be compared using the standard comparison rules. For instance, a non-numeric string will be com- pared to an integer as though it were 0, but multiple string values will be compared alphanumerically. The actual value returned will be of the original type with no conversion applied. PARAMETERS
o $values - An array containing the values. o $value1 - Any comparable value. o $value2 - Any comparable value. o $... - Any comparable value. RETURN VALUES
max(3) returns the parameter value considered "highest" according to standard comparisons. If multiple values of different types evaluate as equal (e.g. 0 and 'abc') the first provided to the function will be returned. EXAMPLES
Example #1 Example uses of max(3) <?php echo max(2, 3, 1, 6, 7); // 7 echo max(array(2, 4, 5)); // 5 // The string 'hello' when compared to an int is treated as 0 // Since the two values are equal, the order they are provided determines the result echo max(0, 'hello'); // 0 echo max('hello', 0); // hello // Here we are comparing -1 < 0, so 'hello' is the highest value echo max('hello', -1); // hello // With multiple arrays of different lengths, max returns the longest $val = max(array(2, 2, 2), array(1, 1, 1, 1)); // array(1, 1, 1, 1) // Multiple arrays of the same length are compared from left to right // so in our example: 2 == 2, but 5 > 4 $val = max(array(2, 4, 8), array(2, 5, 1)); // array(2, 5, 1) // If both an array and non-array are given, the array will be returned // as comparisons treat arrays as greater than any other value $val = max('string', array(2, 5, 7), 42); // array(2, 5, 7) // If one argument is NULL or a boolean, it will be compared against // other values using the rule FALSE < TRUE regardless of the other types involved // In the below example, -10 is treated as TRUE in the comparison $val = max(-10, FALSE); // -10 // 0, on the other hand, is treated as FALSE, so is "lower than" TRUE $val = max(0, TRUE); // TRUE ?> SEE ALSO
min(3), count(3). PHP Documentation Group MAX(3)
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