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Jobs: Using SQL Server Agent you can create and schedule jobs that automate routine administrative tasks. Database administrators create jobs to perform predictable administrative functions either according to a schedule or in response of events and conditions. Jobs can be simple operations containing only a single job step or can be extremely complex operations containing many job steps. SQL Server Agent is responsible for management and execution of all jobs. Agent must be running for jobs to be executed. SQL server 2k supports jobs containing operating system commands. Alerts: database administrators define alerts to provide event and performance condition notification and to execute jobs in response to SQL server events or performance conditions. E.g. when the log is 90% full an alert can be configured to fire a job that executes a job to back up and truncate the transaction log.

First check the processor and memory usage to see that processor is not above 80% utilization and memory not above 40-45% utilization then check the disk utilization using Performance Monitor, Secondly, use SQL Profiler to check for the users and current SQL activities and jobs running which might be a problem. Third would be to run UPDATE_STATISTICS command to update the indexes

 SQL SERVER - is for running the databases
SQL AGENT - is for automation such as Jobs, DB Maintenance, Backups
DTC - Is for linking and connecting to other SQL Servers

First check the processor and memory usage to see that processor is not above 80% utilization and memory not above 40-45% utilization then check the disk utilization using Performance Monitor, Secondly, use SQL Profiler to check for the users and current SQL activities and jobs running which might be a problem. Third would be to run UPDATE_STATISTICS command to update the indexes

SQL Profiler utility allows us to basically track connections to the SQL Server and also determine activities, such as which SQL Scripts are running, failed jobs etc.