Disable sitecore cahe

To tern off sitecore caching set following values in sitecore config.

<!--  CACHING ENABLED
 Determines if caching should be enabled at all
 Specify 'true' to enable caching and 'false' to disable all caching
-->
<setting name="Caching.Enabled" value="false" />
<!--  DISABLE BROWSER CACHING
 If true, all pages will have:
   Cache-Control: no-cache, no-store
   Pragma: no-cache
 in the http header
-->
<setting name="DisableBrowserCaching" value="true" />

Reseting admin password in Sitecore

Sitecore inside Core db stores users information. In order to reset password to 'b' for a user 'admin' one has to run a following script

UPDATE [aspnet_Membership] SET Password='8dC23rEIsvuttG3Np1L4hJmJAOA=', PasswordSalt=' joeLPwcwMq6L7kyuVfVS7g=='   
WHERE UserId IN (SELECT UserId FROM [aspnet_Users] WHERE UserName = 'sitecore\Admin') 

It is important to set both Password and PasswordSalt.