Server status monitor

To configure warning thresholds on several key performance metrics. Database Mirroring Monitor can also be used by members of the dbm_monitor fixed database role to view the most recent row of the mirroring status table, though they cannot update the status table.The monitor displays the status, including performance metrics, for a selected database on the Status tabbed page. The content of this page comes from both the principal and mirror server instances. The page is filled asynchronously as status is gathered through separate connections to the principal and mirror server instances. The monitor tries to update the status table at 30-second intervals. The update succeeds only if the table has not been updated within 15 seconds and the user is a member of the sysadmin fixed server role. For a summary of the information reported on the Status page, see Status Displayed by the Database Mirroring Monitor, later in this topic.For an introduction to the Database Mirroring Monitor interface, see Database Mirroring Monitor Overview. For information on launching Database Mirroring Monitor, see Start Database Mirroring Monitor (SQL Server Management Studio).System stored proceduresYou can also retrieve or update the current status by running the sp_dbmmonitorresults system stored procedure. Other dbmmonitor stored procedures enable you to set up monitoring, change monitoring parameters, view the current update period, and drop monitoring on the server instance.The following table introduces the stored procedures for managing and using database mirroring monitoring independently of the Database Mirroring Monitor.ProcedureDescriptionsp_dbmmonitoraddmonitoringCreates a job that periodically updates the status information for every mirrored database on the server instance.sp_dbmmonitorchangemonitoringChanges the value of a database mirroring monitoring parameter.sp_dbmmonitorhelpmonitoringReturns the current update period.sp_dbmmonitorresultsReturns status rows for a monitored database and allows you to choose whether the procedure obtains the latest status beforehand.sp_dbmmonitordropmonitoringStops and deletes the mirroring monitor job for all the databases on the server instance.The dbmmonitor system stored procedures can be used as an adjunct to the Database Mirroring Monitor. For example, even if monitoring was configured using sp_dbmmonitoraddmonitoring, Database Mirroring Monitor can be used to view the status.How Monitoring WorksThis section introduces the database mirroring status table, database mirroring monitor job and

Nginx Server MonitoringCreating a new Nginx server monitorPrerequisites for monitoring Nginx server metrics: Click hereUsing the REST API to add a new Nginx server monitor: Click hereApplications Manager's Nginx monitoring tool ensures high performance and maximum uptime. To create a Nginx Monitor, follow the steps given below:Click on New Monitor link. Choose Nginx Server.Enter Display Name of the server.Enter the IP Address or hostname of the host in which the monitor is running.Provide the port number in which the monitor is running.Choose SSL option, if SSL is enabled in Nginx Server.Enter the Nginx User Name and Password if the Nginx Server is authenticated.Modify the Nginx Server Status URI if required. This is for getting the server status. The default Server Status URI is nginx_status. You can modify the server status URI using this option, if the server status URI is different.Enter the polling interval time in minutes.If you are adding a new monitor from an Admin Server, select a Managed Server.Choose the Monitor Group from the combo box with which you want to associate Nginx Monitor (optional). You can choose multiple groups to associate your monitor.Click Add Monitor(s). This discovers the Nginx Server from the network and starts monitoring them.Security/Firewall Requirements: The Nginx Server host and port should be accessible from the Applications Manager installed machine.User Privilege: The required user credentials are to be provided.Monitored ParametersAvailability tab gives the availability history for the past 24 hours or 30 days.Performance tab gives the Health Status and events for the past 24 hours or 30 days.List view enables you to perform bulk admin configurations.OverviewParametersDescriptionSupported in PrometheusResponse TimeThe time taken for the Nginx server to respond while monitoring (in milliseconds).Active ConnectionsRefers to connections that are active currently.Requests Per SecondRefers to number of requests received per second.Requests in Reading StateRefers to number of requests in reading state currently.Requests in Writing StateRefers to number of requests in writing state currently.Requests in Waiting StateRefers to number of requests in waiting state currently.

The monitor, how users can monitor database mirroring status, and how the monitoring job can be dropped.Database Mirroring Status TableDatabase mirroring status is stored in an internal, undocumented database mirroring status table in the msdb database. This status table is automatically created the first time the mirroring status is updated on the server instance.The status table may be updated either automatically or manually by a system administrator, with a minimum update interval of 15 seconds. The 15 second minimum prevents server instances from being overloaded with status requests.The status table is updated automatically by both Database Mirroring Monitor and the database mirroring monitor job, if running. Database Mirroring Monitor Job updates the table once a minute by default (a system administrator can specify an update period of 1 to 120 minutes). Database Mirroring Monitor, in contrast, updates the table automatically every 30 seconds. For these updates, Database Mirroring Monitor Job and Database Mirroring Monitor call sp_dbmmonitorupdate.The first time sp_dbmmonitorupdate runs, it creates the database mirroring status table and the dbm_monitor fixed database role in the msdb database. sp_dbmmonitorupdate usually updates the mirroring status by inserting a new row into the status table for every mirrored database on the server instance; for more information, see "Database Mirroring Status Table," later in this topic. This procedure also evaluates the performance metrics in the new rows and truncates rows older than the current retention period (the default is 7 days). For more information, see sp_dbmmonitorupdate (Transact-SQL).NoteUnless Database Mirroring Monitor is currently being used by a member of the sysadmin fixed server role, the status table is automatically updated only if the Database Mirroring Monitor Job exists and [!INCLUDEssNoVersion] Agent is running.Database Mirroring Monitor JobThe database mirroring monitoring job, Database Mirroring Monitor Job, operates independently of Database Mirroring Monitor. Database Mirroring Monitor Job is created automatically only if [!INCLUDEssManStudioFull] is used to start a mirroring session. If ALTER DATABASE database_name SET PARTNER commands are always used to start mirroring, the job exists only if the system administrator runs the sp_dbmmonitoraddmonitoring stored procedure.After Database Mirroring Monitor Job is created, assuming that [!INCLUDEssNoVersion] Agent is running,

And Mirror log () labels on the Status page.Members of the dbm_monitor fixed database role depend on the Database Mirroring Monitor Job to update the status table at regular intervals. If the job does not exist or [!INCLUDEssNoVersion] Agent is stopped, the status becomes increasingly stale and may no longer reflect the configuration of the mirroring session. For example, after a failover, the partners might appear to share the same role-principal or mirror, or the current principal server might be shown as the mirror, while the current mirror server is shown as the principal.Dropping the Database Mirroring Monitor JobThe database mirroring monitor job, Database Mirroring Monitor Job, remains until it is dropped. The monitoring job must be managed by the system administrator. To drop Database Mirroring Monitor Job, use sp_dbmmonitordropmonitoring. For more information, see sp_dbmmonitordropmonitoring (Transact-SQL). Status Displayed by the Database Mirroring MonitorThe Status page of the Database Mirroring Monitor describes the partners, and also the state of the mirroring session. The status includes performance metrics such as the state of the transaction log and other information that is intended to help currently estimate the time required to complete a failover and the potential of data loss, if the session is not synchronized. In addition, the Status page displays status and information about the mirroring session in general.NoteFor an introduction to the Database Mirroring Monitor and Status page, see Tools for Monitoring Database Mirroring Status, earlier in this topic.The information provided for each of these is summarized in the following sections.PartnersThe Status page displays the following information for each of the partners:Server instanceName of the server instance whose status is displayed in the Status row.Current roleCurrent role of the server instance. The possible states are:PrincipalMirrorMirroring stateThe possible states are:UnknownSynchronizingSynchronizedSuspendedDisconnectedWitness connectionConnection status of the witness. The possible states are:UnknownConnectedDisconnected.Log on the Principal ServerThe Status page displays the following information about the status of the log on the principal server as of the indicated time:Unsent logThe amount of log waiting in the send queue in kilobytes (KB).Oldest unsent transactionAge of the oldest unsent transaction in the send queue. The age of this