php - how to increase performance of mysql query? -

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I have already used a username to use this query or I am using Ajax in the database, so far I will record a lot in the Future Username list in only a few DB BTs, so I want to improve the performance of the query in such a way that it will take less time to check the username.

How can I improve the following questions? Is it possible to index on DB? 

  check.php & lt ;? Php if (isset ($ _ POST ['user_name'])) {$ user_name = $ _ POST ['user_name']; Included ("include / conn.php"); $ Sql_check = mysql_query (Choose user id from "vector`, where userid = '". $ User_name. "'") Or die (mysql_error ()); If (mysql_num_rows ($ sql_check)> 0) {echo "no"; } Else {echo "yes"; }}? & Gt; My jquery code & lt; Script language = "javascript" & gt; $ (Document) .ready (function () {$ ("# uname"). Blur (function () {$ ("# msgbox"). RemoveClass (). AddClass ('messagebox'). Text ('checking. Fidine ("slow"); $ .post ("check.php", {user_name: $ (.) .val ()}, function (data) {if (data == 'no') // If no username Available {$ ("# msgbox"). Feedto (200,0.1, function {$ (this) .HTML ('This user name already exists') AddClass ('messageboxerror'). Feedto (900, 1);});} and {$ ("# msgbox"). Feedto (200,0.1, function {$ (this) .html ('username is available to register'). AddClass ('messageboxok '). FadeTo (900,1);})}});});}); & lt; / scripts & gt;  
 
 Yes, you should probably add an index to the user-field field. Something like this will appear:  
  Alternate table 'vector`. `` `` `` `` `` `` >: You can use this line in the MySQL console when you are connected to the database. If you are using PHPMyAdmin, then it also supports adding indexed to their GUI.

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