The SQL DROP INDEX statement is the SQL command that removes an entire SQL index.
You may drop an index permanently when it is no longer useful or temporarily. If the index is harming or not helping performance it could be dropped.
Indexes may slow down the loading of data because they must be maintained during the data load process. For high performance loads, an index could be dropped for the duration of a load and then recreated.
The SQL DROP INDEX command is used as follows.
SQL DROP INDEX Statement Syntax
DROP INDEX <table_name>.<index_name>
SQL DROP INDEX Statement Example
The following example drops an index named IDX_PERSON_NAME on a table named PERSON.
DROP INDEX PERSON.IDX_PERSON_NAME