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This statistic is used by the optimizer during query optimization to determine the relative efficiency of an index. If the rows of a table on disk are sorted in about the same order as the index keys, the database will perform a minimum number of I/Os on the table to read the entire table via the index.

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One of the questions I get asked again and again is how to validate a field value in an Acro Form with a custom validation script.If I drop that table, re-create it with a CHAR(8) datatype, and create the same index, I find that the number of LEAF_BLOCKS is 27,856 and the clustering factor has increased to 1,916,062.Before I answer this, I’d like to explain the meaning and importance of the clustering factor statistic.The query will end up reading every block from the buffer as many times as it has rows on it. NET webform that has a file upload control that is tied to a regular expression validator.The query would not be skipping all over the table to find row after row—they are naturally next to each other on the block.Conversely, if the rows in the table are not in the same order on disk as the index keys—if the data is scattered—the query will tend to perform the maximum number of I/Os on the table, as many as one I/O for every row in the table.However, none seem to address some recent concerns a client of mine had. Unfortunately, even after carefully trying to interpret the documentation (I used the one for 11g R2) I cannot find the actual results being described there.Currently, backup validation is performed once a week and the question asked, “How to validate all archivelog backup? It looks as if RMAN pulls the needed backups, including those for archivelogs, from tape without actually restoring them to disk, but for me this looks like undocumented behaviour.This validator needs to validate that only certain filetypes should be allowed for upload (jpg,gif,doc,pdf) The current regular expression that does this is: I'm sure you know this, but, in case someone later finds this question who doesn't: This method will only verify the file's extension, not its actual type.Once you receive the file, you must examine its contents to determine what it really is.Preferred Method You should always retain a copy of your tax return.When I query USER_INDEXES, I find that the number of LEAF_BLOCKS is 2,226 and the CLUSTERING_FACTOR is 1,516.I want to check what the user is writing in a textbox before I save it in a database. I guess I can always write some ifs or some try-catch blocks, but I was wondering if there's a better method.I've read something about Validating Events, but I am not sure how can I use them. Validating Event When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.

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