I was checking the statistics objects in my Microsoft SQL Server database and found some statistics with strange names. Could you please explain what the _WA_Sys... statistics are? Why are they created? Can I safely delete them? Do they differ from the other statistics objects?

and recreate with following commands help to boost performance?

EXEC sp_createstats @indexonly = 'NO', @fullscan = 'FULLSCAN', @norecompute ='NO'

Could you please suggest?