List of valid and Invalid special characters for URL.

Character	Purpose in URL	Encoding
:	Separate protocol (http) from address	%3A
/	Separate domain and directories	%2F
#	Separate anchors	%23
?	Separate query string	%3F
&	Separate query elements	%24
@	Separate username and password from domain	%40
%	Indicates an encoded character	%25
+	Indicates a space	%2B
<space>	Invalid in URLs	%20 or +
;	Invalid in URLs	%3B
=	Invalid in URLs	$3D
$	Invalid in URLs	%26
,	Invalid in URLs	%2C
<	Invalid in URLs	%3C
>	Invalid in URLs	%3E
~	Invalid in URLs	%25
^	Invalid in URLs	%5E
`	Invalid in URLs	%60
\	Invalid in URLs	%5C
[	Invalid in URLs	%5B
]	Invalid in URLs	%5D
{	Invalid in URLs	%7B
}	Invalid in URLs	%7D
|	Invalid in URLs	%7C
"	Invalid in URLs	%22

How to remove Cache and Buffers in MS SQL Server

To remove procedure/TSQL cache and buffers execute below queries.

DBCC FREEPROCCACHE
DBCC DROPCLEANBUFFERS