And:Rajendra Gupta|Updated: 05/23/2023|Comment|Related:more>Monitor
One of the challenges that database administrators often face is performance issues in SQL Server environments, such as: B. slow response times, high resource usage, and other issues like blocking and deadlocks. To troubleshoot these issues, most database administrators use various tools to monitor and troubleshoot performance issues. The downside to this approach is that if you don't collect the right data or use the right tools, you often lack the information you need to determine the root cause of a problem and determine next steps to optimize database performance.
In this article, we examine the Idera SQL Diagnostic Manager to address these issues and provide DBAs with insight and the only tool they can use to monitor and improve the performance of their entire SQL Server environment.
Identifying and resolving poorly performing queries is critical to ensuring the overall performance and efficiency of your database management system. To identify poorly performing queries, query execution times, resource consumption, and other metrics must be monitored and analyzed. Once identified, query optimization techniques can be used to improve performance. These techniques can include database indexing, query rewriting, and schema design optimization. We'll take a look at some of the SQL Diagnostic Manager features that you can use to monitor, troubleshoot, and improve the health of SQL Server.
Overview of the SQL Diagnostic Manager
SQL Diagnostic Manager is a software tool that provides database administrators with comprehensive capabilities to monitor and manage the performance of Microsoft SQL Server instances. It offers various performance metrics, dashboards, and query monitoring to diagnose issues like slow running queries and excessive resource consumption.
Key features of SQL Diagnostics Manager include:
- Monitor query performance
- Dashboards and Reports
- Query optimization and tuning
- database index
- Notifications and Alerts
The image below shows the general view of the SQL DiagnosticManager, where you can view multiple metrics for a specific SQL Server instance at once (click the image for a larger view).
The user interface is divided into servers, reports, notifications and administration. In each section we will take a closer look at some of the features.
This section contains all useful information for each registered SQL Server.
It consists of the following subsections:
- overview: A high-level overview of server components such as CPU, server latencies, memory, cache, network, disk, transactions, activity notifications, and configuration.
- Conversation: Provides information about SQL Server sessions (Active\Idle\System), lock stats requests, blocked sessions, lock information, and block and deadlock reports.
- Ask: Displays executed queries along with performance data, execution plan, CPU, reads and writes, and SQL text. You can also view historical query trends and query latencies.
- Resource: Focuses on server resources such as CPU usage of SQL Server and OS processes, number of compilations, number of recompilations, memory usage (used/allocated), cache hit ratio, physical I/O, disk and file activity, and server latency.
- Database: Provides a list of databases, their status, recovery model, size, and capacity usage.
- surcharge: You can view the status, start time, service account and startup type of each SQL service.
- Protocol: Provides access to SQL Server and SQL Agent log files.
- analyze: This will help you analyze your SQL Server and alert you to any anomalies.
This section provides information on how to monitor, analyze, and run several built-in reports.
The Alerts tab shows you many different views and you can configure and log many different alerts in the SQL Diagnostic Manager, for example:
- from the server
- Metric system
- The SQL Server Agent job failed
- blocked session
- previous open deals
- Query trace events
- table hash
This allows you to take proactive action when issues arise before they become severe and impact performance.
Identify and process critical alerts
The SQL Diagnostic Manager has predefined thresholds and mechanisms to warn of anomalies in an instance of SQL Server. To see notifications that you should deal with, clickCriticalUnder Control Panel HomeOut of my sight.This view displays alerts that are critical to your entire SQL Server environment, allowing you to focus on issues that require immediate attention.
Alternatively, in the Alerts section, you can filter alerts by a specific time range, tag (you can assign each instance a different tag value for easy grouping), server, metric, or severity. The list of event notifications is as follows.
SQL Server and database health
SQL Diagnostic Manager provides valuable charts to view and determine the health of SQL Server. If you click on a registered instance of SQL Server, the following information is displayed:
- Health of SQL Server Instance: As shown in the following image, the health status of this server is critical and the following issues exist:
- The SQL agent has stopped
- The OS processor queue length is 5
- The master database has not been backed up for 7314 days
Clicking on a server name brings up several helpful charts for you to highlight and troubleshoot.
There are many different interactive charts where you can select a timeline and filter data across all charts. Suppose I want to see CPU, memory and other information when a deadlock occurs in SQL Server. I can filter information from session table like this.
If the memory usage of the SQL Server process is high, you can use the Resources tab to get memory-related data. You can analyze various SQL memory usage items and their changes from baseline, including:
- Buffer cache: free and active pages
- Operating System Paging
- cache hit ratio
- Page life expectancy (seconds)
The details page in the SQL Diagnostics Manager has predefined metrics whose status is calculated based on the current data. For example, my processor's queue length is marginal, while other parameters like blocking sessions and queue length are fine. To view this data, go to Server > Overview > Details to view details, warnings, and critical thresholds.
Another common performance issue with SQL Server is prolonged blocking. You can quickly get this data using the SQL Diagnostic Manager by viewing the Session Summary page.
The session graph shows the total number of deadlocks, starting blocks, blocked sessions, and active sessions. From the figure below, we can understand the following:
- no standstill
- There are 4 blocked sessions
- There is 1 blocking period
- There are 5 active sessions
This is another blocking view that you can get from Server > Session > Summary.
Click the Blocking tab (Server > Sessions > Blocking) to view the blocking tree with details for each blocking and blocking session. In this case we can see that the leading interceptor is session ID 54.
To get more details about a specific session ID, right-click it and choose View Session Details.
Below are session ID details including the last command run, tempdb usage and locking information.
To kill the root block, you can right-click the session ID and select KillSession.
Then confirm that you want to end the session.
You will be notified when the session ends.
If we look again at the block session diagram, we can see that the block has been resolved.
Another common problem in SQL Server is deadlock, which is caused by contention between two or more sessions for their lock requests. You can use the deadlock graph to identify and investigate deadlocks in SQL Diagnostic Manager. Below we see a list of deadlocks that have occurred and when they occurred.
If we open any of the deadlock reports, we can see the details of the sessions, resources, and queries involved.
You can also export this deadlock information to XDL format and open it as a deadlock graph in SQL Server Management Studio.
Poorly performing query
SQL Diagnostic Manager uses query screens to capture SQL Server workloads. It can collect data in the following different ways:
If you experience performance issues, you can view queries against SQL text, application, or database. For example, the screenshot below shows the most common resource queries in my environment and their CPU time, reads, and writes.
To view the query details, right-click the query and select View Query Text to view the query history.
Query history provides historical data on execution, average duration, and average reads and writes, as shown below.
Clicking the Details column displays the query execution plan (estimated) in graphical and XML format.
You can also use diagnostic queries on the Query History page to provide suggestions on how to optimize your query.
Problems were identified during the analysis
The SQL Diagnostic Manager provides insight into your SQL Server by analyzing the server and making recommendations on issues to resolve. Click Analyze to view a list of configuration, query tuning, and tuning recommendations.
Here is a breakdown report of my SQL instance with each item sorted by priority.
SQL Diagnostic Manager can also generate scripts that you can use to make recommended configuration changes. For example, the SQL Diagnostic Manager shows that QUOTED_IDENTIFIER is currently enabled for the AdventureWorks2019 database.
clickscript optimizationYou will get a script like below which can then be copied or run directly on the SQL Server instance.
This article describes how SQL Diagnostic Manager can identify and troubleshoot SQL Server performance issues. Some important conclusions are:
- SQL Diagnostic Manager helps database administrators monitor and troubleshoot SQL Server performance issues.
- The SQL Diagnostic Manager can help you find and fix poorly performing queries.
- You can use the SQL Diagnostic Manager to monitor blocking and deadlocks.
- With the SQL Diagnostic Manager you can manage SQL Server more proactively.
- With the SQL Diagnostic Manager you can view what is happening now or what has happened in the past to further improve troubleshooting.
Readers are encouraged to try SQL Diagnostic Manager to identify and troubleshoot performance-related issues in their own database environments. Idera offers a 14-day free trial.Click hereStart now.
MSSQLTips.com Product Spotlight is sponsored by Idera, makers of SQLDiagnostic Manager.
About the author
Rajendra Gupta is a DBA consultant with over 14 years of extensive database administration experience including large mission critical OLAP, OLTP, Reporting and SharePoint databases.
Check out all my tips
- First, find out if SQL Server is causing high CPU usage (using Perfmon counters).
- Identify queries contributing to CPU usage.
- Update statistics.
- Add missing indexes.
- Investigate and resolve parameter-sensitive issues.
- Investigate and resolve SARGability issues.
- Find a Value or Data Column While Tracing (SQL Server Profiler)
- Save Deadlock Graphs (SQL Server Profiler)
- Save Showplan XML Events Separately (SQL Server Profiler)
- Save Showplan XML Statistics Profile Events Separately (SQL Server Profiler)
- Examine the query plan of the query.
- Update Statistics.
- Identify and apply Missing Indexes. ...
- Redesign or rewrite the queries.
- Identify and resolve parameter-sensitive plans.
- Identify and resolve SARG-ability issues.
- Deploy a Performance Monitoring Solution.
- Use the Latest and Greatest Version of SQL Server and the OS.
- Design Your Server from the Ground Up.
- Ensure Your Server Can Handle the Expected Workload.
- Assign the Optimal Data Types.
- Resolve Blocking and Deadlocks.
- Optimize Indexes.
Performance issues can be caused due to software updates, corrupt apps or drivers, or a hardware failure. Some symptoms that indicate system performance issues are: The computer is taking a longer time to boot into the operating system than before. Applications are taking a longer time to load or respond.How to identify performance issue in SQL? ›
- Improper SQL Server instance or database settings.
- Insufficient hardware resources or incorrect settings.
- I/O problems.
- Incorrect TempDb settings.
- Lock or deadlock problems.
- Poor performer queries.
The SQL Server monitor is able to track the performance of factors such as database connections, blocked sessions, cache hit ratio, tablespace resources, resource locks, backup performance, and database file sizes.What is monitoring tool in SQL? ›
SQL Monitor includes multiple tools to make your life monitoring SQL servers and SQL databases easier. Save time and money with an overview of your installed versions and patches, SQL Server licensing, disk usage statistics, backups and SQL Agent job status.How do you handle SQL performance? ›
- Ensure your TempDB database is configured optimally. ...
- Make sure you're running index maintenance frequently. ...
- Implement indexes that provide a benefit to your queries. ...
- Check your most expensive queries and stored procedures. ...
- Monitor your performance counters.
- Use column names instead of SELECT * ...
- Avoid Nested Queries & Views. ...
- Use IN predicate while querying Indexed columns. ...
- Do pre-staging. ...
- Use temp tables. ...
- Use CASE instead of UPDATE. ...
- Avoid using GUID. ...
- Avoid using OR in JOINS.
- Step 1: Verify that SQL Server is causing high CPU usage. ...
- Step 2: Identify queries contributing to CPU usage. ...
- Step 3: Update statistics. ...
- Step 4: Add missing indexes. ...
- Step 5: Investigate and resolve parameter-sensitive issues.
- 1: Check your database server.
- 2: Improve indexing strategies.
- 3: Identify access to database.
- 4: Evaluate connection capacity.
- 5: Optimize Queries.
- 6: Database Performance Resources.
- Specify column names instead of using * in SELECT statement. Try to avoid * ...
- Avoid temp temporary table. Temporary tables usually increase a query's complexity. ...
- Create Proper Index. Proper indexing will improve the speed of the operations in the database.
- Use Join query instead of sub-query and co-related subquery.
1. Use the Database Engine Tuning Advisor. An important performance optimization tool for SQL performance tuning is the Database Engine Tuning Advisor. This tool allows admins to evaluate single Transact-SQL statements or a batch of statements to determine where improvements can be made.What are three troubleshooting processes? ›
Identify the problem. Establish a theory of probable cause. Test the theory to determine the cause.What is step 4 of troubleshooting? ›
- Step 1: What exactly is the problem? ...
- 2) Gather more details, eliminate variables. ...
- Step 3: Reproduce the problem, develop hypothesis of root cause. ...
- Step 4: Attempt a fix based on findings. ...
- Problem Solved?
Step 4. Create a plan of action and test a solution. Once the problem is understood, troubleshooters develop a plan to tackle the issue. They test their hypothesis and keep testing it until they identify a solution.What factors affect performance in SQL Server? ›
Five factors influence database performance: workload, throughput, resources, optimization, and contention. The workload that is requested of the DBMS defines the demand.How do I monitor SQL queries? ›
- Start SQL Server Management Studio.
- To open Activity Monitor: Right-click the SQL Server instance node and select Activity Monitor, or. Press Ctrl+Alt+A, or. Click the Activity Monitor icon in the menu.
On your desktop or laptop (not the SQL Server itself), go into Control Panel, Administrative Tools, Performance.
- use employees.
- select file_id, name as [Datafile name],
- physical_name as [Datafile location],
- growth*8/1024 as [Datafile growth] from sys. database_files.
These tools can include key performance indicators (KPIs), dashboards, checklists, and monitoring plans.Which Oracle tools can be used to monitor SQL performance? ›
|Event Viewer||Monitor database events.|
|Trace Files||Record occurrences and exceptions of the database operations.|
|Alert Logs||Record important information about error messages and exceptions during database operations.|
- Monitor Availability and Resource Consumption. This first step of proactive monitoring is to check whether all databases are online at regular intervals. ...
- Measure and Compare Throughput. ...
- Monitor Expensive Queries. ...
- Track Database Changes. ...
- Monitor Logs.
In SQL Server Analysis Services, a KPI is a collection of calculations that are associated with a measure group in a cube that are used to evaluate business success. Typically, these calculations are a combination of Multidimensional Expressions (MDX) expressions or calculated members.How to check mssql server performance? ›
Locating MySQL performance metrics
Performance schema: This is a MySQL feature for monitoring MySQL Server events and query execution. Performance metrics are obtained by querying one or more tables in the performance_schema database such as the events_statements_summary_by_digest table.