How do I get the last index in SQL?
If you want to get the index of the last space in a string of words, you can use this expression RIGHT(name, (CHARINDEX(‘ ‘,REVERSE(name),0)) to return the last word in the string. This is helpful if you want to parse out the last name of a full name that includes initials for the first and /or middle name.
How do I find the index of a string in SQL?
We use the SQL CHARINDEX function to find the position of a substring or expression in a given string. We might have a character in different positions of a string. SQL CHARINDEX returns the first position and ignores the rest of matching character positions in a string.
Why are there unused indexes in SQL Server?
An example of additional reasons for caution is that the index might be listed as unused, but it might be enforcing a unique constraint, and it is likely that the query optimizer might need this index.
What happens when an index is used the first time?
When an index is used for the first time, a new row gets created in the dm_db_index_usage_stats DMV and subsequently updated every time an index is used. However, as with every DMV, the data present in dm_db_index_usage_stats contain only the data since the last SQL Server service restart (SQL Server service restart resets the data in the DMV).
How does SQL Server index usage stats work?
The dm_db_index_usage_stats DMV displays essential information about index usage, and it can be a useful tool in identifying unused SQL Server indexes. When an index is used for the first time, a new row gets created in the dm_db_index_usage_stats DMV and subsequently updated every time an index is used.
What happens when an index is updated in SQL Server?
INSERT, UPDATE, and DELETE operations cause index updating and thus duplicating the data that already exists in the table. As a result, this increases the duration of transactions and the query execution and often can result in locking, blocking, deadlocking and quite frequent execution timeouts.