Which Php Framework To Choose For Website Development A Complete Guide

Which Php Framework Choose For Website Development There isn't enough information here to provide an adequate answer. anytime you add ordering to a query it will affect performance because the results have to be ordered. the amount of impact however is not a static answer. there a number of factors involved. No, order by is one of the last operations in the logical processing order. top is the last. the logical order should not be confused with the actual order of the logical and physical execution plan operators.

Which Php Framework Choose For Website Development Any calculation or function, when applied to an index key column, will prevent sql server from using that index. in your case, order by id desc can make use of an ordered scan of the clustered index on your table, as id is the key column on that index. that means, only 20 rows have to be read. In sql server, the order by statement is used to sort the result set of a query in a specified order. while sorting is a common requirement in many queries, it can have a significant impact on query performance, especially when dealing with large datasets. When you include an order by clause, the database has to build a list of the rows in the correct order and then return the data in that order. this can take a lot of extra processing which translates into extra time. An ideal one would be on fk usageid and be a "filtered" index, using a where clause of where typeid = 'abc'. given such an index, this query might go as fast as it can.

Which Php Framework Choose For Website Development When you include an order by clause, the database has to build a list of the rows in the correct order and then return the data in that order. this can take a lot of extra processing which translates into extra time. An ideal one would be on fk usageid and be a "filtered" index, using a where clause of where typeid = 'abc'. given such an index, this query might go as fast as it can. For example, to place rows in name order, it must sort all rows by name. this will be slow if there are a lot of rows, and no index to provide that order without sorting. I don't think i have ever seen a fast forward cursor that performed a lot worse than a static cursor, but i'm not using something i don't understand. depending on the query, you may get a different cursor type than what you ask for. Order by is not particularly slow, especially if there is an index on that column. in particular, if you have a clustered index on that column, the data is already sorted. More than likely, the reason it was taking so long is that there isn't an index on what you are sorting on, or you are attempting to sort a huge result set. if you have an index, try using explicit index hints in the from statement. if this changes the sort time, try updating the statistics on this table.

Php Framework Choosing Ultimate Guide For Web Development For example, to place rows in name order, it must sort all rows by name. this will be slow if there are a lot of rows, and no index to provide that order without sorting. I don't think i have ever seen a fast forward cursor that performed a lot worse than a static cursor, but i'm not using something i don't understand. depending on the query, you may get a different cursor type than what you ask for. Order by is not particularly slow, especially if there is an index on that column. in particular, if you have a clustered index on that column, the data is already sorted. More than likely, the reason it was taking so long is that there isn't an index on what you are sorting on, or you are attempting to sort a huge result set. if you have an index, try using explicit index hints in the from statement. if this changes the sort time, try updating the statistics on this table.