System mirroring

Author: m | 2025-04-25

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Title description author ms.author ms.date ms.service ms.subservice ms.topic helpviewer_keywords Monitoring Database Mirroring (SQL Server) Learn about the Database Mirroring Monitor, system stored procedures, and how database mirroring monitoring works, including the Database Mirroring Monitor Job. MikeRayMSFT mikeray 03/14/2017 sql database-mirroring how-to monitoring [SQL Server], database mirroring database mirroring [SQL Server], monitoring [!INCLUDE SQL Server]This section introduces Database Mirroring Monitor and the sp_dbmmonitor system stored procedures, explains how database mirroring monitoring works (including the Database Mirroring Monitor Job), and summarizes the information that you can monitor about database mirroring sessions. Additionally, this section introduces how to define warning thresholds for a set of predefined database mirroring events and how to set up alerts on any database mirroring event.You can monitor a mirrored database during a mirroring session to verify whether and how well data is flowing. To set up and manage monitoring for one or more of the mirrored databases on a server instance, you can use either Database Mirroring Monitor or the sp_dbmmonitor system stored procedures.A database mirroring monitoring job, Database Mirroring Monitor Job, operates in the background, independently of Database Mirroring Monitor. [!INCLUDEssNoVersion] Agent calls Database Mirroring Monitor Job at regular intervals, the default is once a minute, and the job calls a stored procedure that updates mirroring status. If you use [!INCLUDEssManStudioFull] to start a mirroring session, Database Mirroring Monitor Job is created automatically. However, if you only use ALTER DATABASE SET PARTNER to start mirroring, you must create the job by running a stored procedure.In this Topic:Monitoring Mirroring StatusAdditional Sources of Information About a Mirrored DatabaseRelated Tasks Monitoring Mirroring StatusTo set up and manage monitoring for one or more of the mirrored databases on a server instance, you can use either Database Mirroring Monitor or the dbmmonitor system stored procedures. You can monitor a mirrored database during a mirroring session to verify whether and how well data is flowing.Specifically, monitoring a mirrored database enables you to:Verify that mirroring is functioning.Basic status includes knowing if the two server instances are up, that the servers are connected, and that the log is being moved from the principal to the 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,

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The job is called once a minute, by default. The job then calls the sp_dbmmonitorupdate system stored procedure.[!INCLUDEssNoVersion] Agent calls Database Mirroring Monitor Job once a minute, by default, and the job calls sp_dbmmonitorupdate to update the status table. System administrators can change the update period by using the sp_dbmmonitorchangemonitoring system stored procedure, and they can view the current update period by using the sp_dbmmonitorchangemonitoring system stored procedure. For more information, see sp_dbmmonitoraddmonitoring (Transact-SQL) and sp_dbmmonitorchangemonitoring (Transact-SQL).Monitoring Database Mirroring Status (by System Administrators)Members of the sysadmin fixed server role can view and update the status tableUsing Database Mirroring MonitorWhen using Database Mirroring Monitor, a system administrator can manually refresh the Status page, navigation tree, or History page. This also updates the status table, unless it has already been updated within the previous 15 seconds.To view the history of mirroring status on a given server instance, the system administrator can also click the History button for a server instance (on the Status page). The history is displayed in the Database Mirroring History dialog box. There, the system administrator can view some or all of the rows in the status table of the server instance.For information about the Status page metrics, see Performance Metrics Displayed by the "Database Mirroring Monitor," later in this topic.Using sp_dbmmonitorresultsSystem administrators can use the sp_dbmmonitorresults system stored procedure to view and, optionally, to update the status table, if it has not been updated within the previous 15 seconds. This procedure calls the sp_dbmmonitorupdate procedure and returns one or more history rows, depending on the amount requested in the procedure call. For information about the status in its results set, see sp_dbmmonitorresults (Transact-SQL).Monitoring Database Mirroring Status (by dbm_monitor Members)As mentioned, the first time sp_dbmmonitorupdate runs, it creates the dbm_monitor fixed database role in the msdb database. Members of the dbm_monitor fixed database role can view the existing mirroring status by using either Database Mirroring Monitor or the sp_dbmmonitorresults stored procedure. But these users cannot update the status table. To learn the age of the displayed status a user can look at the times in the Principal log (). Kindly verify screen mirroring of Roku is configured or working properly: Settings/System/Screen mirroring/Screen mirroring mode=Prompt; Settings/System/Screen mirroring/Screen mirroring devices/Always blocked=none; Settings/System/Advanced system settings/Device connect=Enabled; Settings/System/Advanced system settings/Control by

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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 Mirror.Determine whether the mirror database is keeping up with the principal database.During high-performance mode, a principal server can develop a backlog of unsent log records that still need to be sent from the principal server to the mirror server. Furthermore, in any operating mode, the mirror server can develop a backlog of unrestored log records that have been written to the log file but still need to be restored on the mirror database.Determine how much data was lost when the principal server instance becomes unavailable during high-performance mode.You can determine data loss by looking at the amount of unsent transaction log (if any) and the time interval in which the lost transactions were committed at the principal.Compare current performance with past performance.When problems are occurring, a database administrator can view a history of the mirroring performance to help in understanding the current state. Looking at the history can allow the user to detect trends in performance, identify patterns of performance problems (such as times of day when the network is slow or the number of commands entering the log is very large).Troubleshoot the cause of reduced data flow between mirroring partners.Set warning thresholds on key performance metrics.If a new status row contains a value that exceeds a threshold, an informational event is sent to the Windows event log. A system administrator can then manually configure alerts based on these events. For more information, see Use Warning Thresholds and Alerts on Mirroring Performance Metrics (SQL Server). Tools for Monitoring Database Mirroring StatusMirroring status can be monitored using either Database Mirroring Monitor or the sp_dbmmonitorresults system stored procedure. These tools can be used to monitor database mirroring on any mirrored database on the local server instance by both System administrators, that is, members of the sysadmin fixed server role, and user who have been added to the dbm_monitor fixed database role in the msdb database by a system administrator. When using either tool, a system administrator can also manually refresh mirroring status.Database Mirroring MonitorDatabase Mirroring Monitor is a graphical user interface tool that enables system administrators to view and update status and

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To set up effective mirroring, delve into our comprehensive guide on mirroring Mac to LG TV. Follow step-by-step instructions covering preparatory guidelines, screen mirroring techniques, and a bonus section for phone-to-PC mirroring. Elevate your viewing experience effortlessly with these detailed insights. Part 1. Preparatory Guidelines Before Mirroring Mac to LG TV Part 2. How to Screen Mirror Mac to LG TV Part 3. Bonus: Screen Mirror Your Phone to a PC Part 4. FAQs About Mirroring Mac to LG TVPart 1. Preparatory Guidelines Before Mirroring Mac to LG TVMirroring your Mac to an LG TV involves displaying your Mac's screen on the TV. Here's a guideline on what you need to do before initiating the mirroring process:1. Check Compatibility:Ensure that your Mac and LG TV support the same mirroring technology. Common options include AirPlay for Apple devices and Miracast for some LG TVs. Newer LG Smart TVs might also support Apple's AirPlay.2. Connectivity:WiFi Network: Connect your Mac and LG TV to the same WiFi network.Cables: An HDMI cable or other compatible cables can be utilized if your Mac and LG TV support a connected connection.3. Update Software:● ac: Make sure your Mac's operating system is up to date. Navigate to the System Preferences menu on the Apple toolbar and click Software Update.● LG TV: Check for firmware updates on your LG TV. The exact steps can vary, but typically, you can find this option in the TV's settings menu.4. Enable Screen Mirroring on LG TV:Navigate to your LG TV's settings menu.Look for an option like Screen Share, Screen Mirroring, or AllShare Cast. Enable it.5. Enable AirPlay on LG TV if applicable:For newer LG TVs, especially those with smart features, check if AirPlay is supported. You should enable it in the TV settings.6. Enable AirPlay on Mac:On your Mac or iPhone, clicking on the AirPlay icon in the menu bar usually appears as a rectangle with a pointing arrow or going to System Preferences > Displays > AirPlay Display. Select your LG TV to initiate screen mirroring iPhone to the TV or even mirroring Mac to TV.Part 2. How to Screen

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Business exponentially.​​​​​​​​​Are You a Therapist, Coach, or Wellness Entrepreneur?Grab Our Free eBook to Learn How toGrow Your Wellness Business Exponentially! ✓ Save hundreds of hours of time ✓ Earn more $ faster ​✓ Boost your credibility ✓ Deliver high-impact content What Is Mirroring? (A Definition)​In psychology, the term mirroring refers to when we unconsciously imitate someone else’s behavior in social interactions. This can include body language, facial expressions, and tone of voice (Chartrand & Bargh, 1999). Researchers believe mirroring is an automatic and involuntary process. A more technical term for mirroring is isopraxis. You may also hear it referred to as “the chameleon effect” or emotional mimicry.​Video: What Is MirroringBenefits of MirroringThe positive effects of mirroring are mostly related to building connections, empathy, or affiliation with others. Here are some benefits:​Mirroring creates social bonds and builds social connection (Chartrand & Bargh, 1999).It promotes interpersonal communication and empathy. When we mirror each other, an empathetic relationship is more likely to develop (Rajmohan & Mohandas, 2007).Mirroring increases prosocial behavior. When we are being mirrored, we tend to be more helpful, and this effect also applies to the person doing the mirroring (van Baaren et al., 2004).Mirroring increases rapport, liking, and trust between people (Chartrand & Bargh, 1999).It helps create a sense of similarity and shared experience (Chartrand & Bargh, 1999).Why Do We Use Mirroring?Mirroring is embedded in the way our brains work through the mirror neuron system. The mirror neuron system is a group of specialized neurons (nerve cells) that automatically trigger. Kindly verify screen mirroring of Roku is configured or working properly: Settings/System/Screen mirroring/Screen mirroring mode=Prompt; Settings/System/Screen mirroring/Screen mirroring devices/Always blocked=none; Settings/System/Advanced system settings/Device connect=Enabled; Settings/System/Advanced system settings/Control by Kindly verify screen mirroring of Roku is configured or working properly: Settings/System/Screen mirroring/Screen mirroring mode=Prompt; Settings/System/Screen mirroring/Screen mirroring devices/Always blocked=none; Settings/System/Advanced system settings/Device connect=Enabled; Settings/System/Advanced system settings/Control by mobile

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Software: Keep your TV’s firmware and mobile device’s operating system up to date.Disable Firewall: Temporarily disable any firewall or security software that may be blocking the connection.Try a Different App: If you’re using a third-party screen mirroring app, try using the built-in screen mirroring feature of your device.Enhance Your Screen Mirroring ExperienceTo elevate your screen mirroring experience, consider these additional tips:Use a Dedicated App: For a more stable and feature-rich connection, download a dedicated screen mirroring app for your mobile device.Optimize Wi-Fi: Ensure your Wi-Fi connection is strong and stable to minimize lag and interruptions.Use HDMI Cable: If you prefer a wired connection, consider using an HDMI cable to connect your mobile device directly to your TV.In a nutshell: Elevate Your Entertainment with Screen MirroringScreen mirroring with Sony TV is a game-changer, allowing you to seamlessly share content from your mobile devices to the big screen. By following the steps outlined in this guide, you can effortlessly connect your devices and enjoy the ultimate entertainment experience. Whether it’s for watching movies, playing games, or giving presentations, screen mirroring will transform your Sony TV into a versatile hub of entertainment and convenience.Questions We Hear a LotQ: Can I screen mirror from any mobile device to my Sony TV?A: Most modern smartphones and tablets support screen mirroring, but compatibility may vary depending on the device’s operating system and hardware.Q: Is there a limit to the distance between my mobile device and Sony TV for screen mirroring?A: The optimal distance for screen mirroring is within the same room as your TV. However, the actual distance may vary depending on the strength of your Wi-Fi signal and the specific devices you are using.Q: Can I use screen mirroring to share protected content?A: Screen mirroring does not bypass DRM (Digital Rights Management) protection. If the content you wish to share is protected, you may need to use a different method or obtain permission from the content owner.