Since the DMF sys.dm_io_virtual_file_stats shows cumulative I/O statistics value for the database files, you can’t just use the DMF to shoot a conclusion that the database files are experiencing high latency issue. The reason is the overall aggregation will mask spikes of poor performance. It is recommended to capture the latency data over a period […]
SQL Server Database Files Wise I/O Latency Details PART#1
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One of the real-world I/O troubleshooting problems is – If you have your databases spread across multiple LUNs and you want to find out which database files are experiencing high latency issues and driving the most I/Os to storage subsystem using performance counter (Avg. Disk sec/Read & Avg. Disk sec/Write). The counter doesn’t help you to identify […]
How the Initial VLF sequence number gets decided of the default transaction log file
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In last three years, I presented two times on the topic Transaction Log File Architecture. During the sessions, when I discussed the undocumented command DBCC LOGINFO, one of the common questions which I got – ‘How the Initial VLF sequence number gets decided of the default transaction log file’? In this tip, I will show you how the […]
SQL Server 2017 – DMF – sys.dm_db_log_info
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The release of Microsoft SQL Server 2017 brought a lot of very interesting new features. One of them is the addition of DMF sys.dm_db_log_info. It allows having a look at the structure of the transaction log without using the undocumented DBCC LOGINFO command. DMF – sys.dm_db_log_info It returns VLF information of the transaction log file […]
Top Function – Performance Gain
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Recently, I presented at Singapore SQL Pass Chapter on the topic T-SQL Fun, and the most of the attendees were a developer. During the session, I discussed TOP function, and I throw a question to the audience – “Not using Top function especially when you can use it – Can it cause performance problem or […]
Log File Space Issue Monitoring Using SQL Server DMV
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As a continuation of “Database Monitoring using DMV” series, this blog will cover how quickly you can address the log file space related issue. Below are the previous blogs which you may find useful in your everyday job. Disk Space Monitoring Using SQL Server DMV SQL Database File Wise Disk Space Monitoring To address the […]
SQL Server 2017 sys.dm_os_enumerate_fixed_drives
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In SQL Server 2017, you can use the new DMV sys.dm_os_enumerate_fixed_drives to identify free disk space. The DMV is replacement of xp_fixeddrives. Old way XP_FIXEDDRIVES New Way SELECT * FROM sys.dm_os_enumerate_fixed_drives; I wish Microsoft could have included the capacity of the drive. Not including the drive capacity requires the DBA to perform additional computations to […]
SQL Server 2017 – The operating system returned the error 21
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Recently, I was exploring SQL Server 2017 CTP 2.0 using SQL Server Management Studio V17. Till the time, I was restoring the databases using tsql script on the SQL Server 2017 instance, and I didn’t encounter any issue. But, When I tried to restore a database backup using GUI using SSMS V17, I encountered the […]
Setting Up a Subscription
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In the last two blogs, we went through Configure Distribution Database and Publication Creation. If you haven’t read them, I will request you to go through before you start exploring this blog. If you don’t have the Subscription database, You must create your subscription database. Once you created the database, you’re ready to create your […]
Setting Up a Publication for Transaction Replication
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In the previous blog, we discussed how to Configure Distribution Database. Once you setup your Distribution database successfully, you can create a publication. Here, we will learn how to create a publication for Transaction Replication and how many jobs get created after the publication setup. Create Publication I’ll walk you through step by step process […]