First of all, an index in SQL Server can only have at most 900 bytes in its index entry. That alone makes it impossible to have an index with all columns. Most of all: such an index makes no sense at all. What are you trying to achieve?? Consider this: if you have an index … Read more
IF NOT EXISTS(SELECT * FROM sys.indexes WHERE name=”MyTableIndex” AND object_id = OBJECT_ID(‘tablename’)) BEGIN — Index with this name, on this table does NOT exist END
I just want to put in a word of warning: please very carefully pick your clustered index! Every “regular” data table ought to have a clustered index, since having a clustered index does indeed speed up a lot of operations – yes, speed up, even inserts and deletes! But only if you pick a good … Read more
A clustered index alters the way that the rows are stored. When you create a clustered index on a column (or a number of columns), SQL server sorts the table’s rows by that column(s). It is like a dictionary, where all words are sorted in alphabetical order in the entire book. A non-clustered index, on … Read more
Clustered Index Only one per table Faster to read than non clustered as data is physically stored in index order Non Clustered Index Can be used many times per table Quicker for insert and update operations than a clustered index Both types of index will improve performance when select data with fields that use the … Read more
With a clustered index the rows are stored physically on the disk in the same order as the index. Therefore, there can be only one clustered index. With a non clustered index there is a second list that has pointers to the physical rows. You can have many non clustered indices, although each new index … Read more