Report for Database Transactions per Second

Hi, I am looking for a min/max/avg type of report for DB transactions/sec. I was able to come up with this for current data, but no amount of digging thru the db can let me find where the history data for this is kept. It must be somewhere, since I can look on a db by db basis and chart it. Any help would be appreciated, thanks!

selectdistincttop 20 a.nodeid,

            a.nodenameasNodeName,

            a.componentid,

            b.nameasDatabaseName,

            b.id,

            a.statisticdataasTransactionsPerSecond,

            d.NameasComponent

  fromapm_sqlbbcomponentalertsdataainnerjoinapm_componentextdona.ComponentID=d.id

           innerjoinapm_sqlbbcurrentdatabasesbond.ApplicationItemID=b.id

  whered.name='Transactions/Sec'

  orderbya.StatisticDatadesc