Database Performance for Newbies

Hello Forum,

the Database I have is now running for 1,5 years.

At the beginnig there where 90.000 login data per month. Now there are over 900.000 login data per month stored in a table.

I am now a little concerned about the performance, because I do not know anithing about it. Maybe the database crashes if 1.000.000 will bereached or what ever. I do not know.

I red few posts here in the forum about performance, but they are to complicated for me or I red the wrong ones.

Can somebody help me getting out some statistics or when the limit of the hardware resources will be reached or something?

I just did the following:

SELECT object_name, counter_name, cntr_value * 8/1024.0 AS SizeMB
FROM sys.dm_os_performance_counters 
WHERE object_name = 'SQLServer:Buffer Manager' 
	 counter_name IN ('Total pages', 'Target pages')

And got as result:

SQLServer:Buffer Manager     Total pages    7943.0000
SQLServer:Buffer Manager     Target pages  27565.8125

And if I go to the computer management console and look at performance it says:

Available MB:  21.759

Guranteed used Bytes (%):  16.9

So maxbe someone has some querys, tools or what ever for me, I can use and know if it looks good and when it will look bad.

Kind regards

Peter