where (policyname) do you make this exclusion and way? (performance or ?)
It's the "MOVE AV [Multi-Platform] Client 2.6.0:MOVE AV [Multi-Platform]" policy and from Microsofts best practise Doc. for SQL-Servers. And yes, it's for performance.
McAfee MOVE AV 2.6 Multiplatform Patch 1 does not currently support the use of wildcards. Please use the following syntax examples to correctly create the exclusions that are needed for your configuration.
McAfee MOVE Antivirus – Path and Process exclusion examples.
McAfee MOVE 2.5 & 2.6 Agentless does not support the use of wildcards or environment variables. No wildcarding syntax is allowed.
The exclusion list is a pattern match, so "\test.docx" excludes any path that includes that string and "\Temp\" excludes any path that includes that string.
NOTE: All sub-folders are also excluded.
Here are some examples:
*NOT* Support syntax
Please note: MOVE AV 2.6 Multiplatform Patch 2 will add full VirusScan Enterprise style wildcard exclusion support. This new feature also includes the ability to export the VirusScan Enterprise exclusion policy and import them directly into the MOVE AV 2.6 Multiplatform policy from the ePO Server.
The Patch 2 update also adds support for ePO 5.0 and the McAfee Agent 4.8.
The MOVE AV 2.6 Multiplatform Patch 2 is expected to be released in Q1-2013 (March).