Author: Abhishek Yadav
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SQL Agent Jobs running multiple times out of schedule
This was interesting issue which I faced in one of my production environment. Customer complained their all SSIS jobs are running multiple times at a schedule. But in job history, it was showing all well. We found, all the scheduled Backup maintenance jobs also triggering two times at a schedule. We tried below…
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SQL Server VSS Writer Service
Microsoft built the capability into windows allowing files to be backed up to disk while other programs are using those files. The VSS Servicer interacts with the Windows Volume Shadow Copy service (VSS), allowing files that are in use, such as SQL Server data files, to be copied (or backed up) without stopping all other…
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SQL Server Architecture Diagram
Hey guys, In this blog I am going to explain you about SQL Server Architecture Diagram In almost every SQL DBA interview, this is the question which thrown as a hard ball from interviewer. Below is high level SQL Server Architecture Diagram which is hard to explain in telephonic interview as well as face to…
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Phases of Recovery in Database
At the time of SQL instance reboot or start, database goes in the three phases of recovery… 1. Analysis Phase of recovery 2. Redo Phase of recovery 3. Undo Phase of recovery 1. Analysis Phase of recovery This phase does two things… First, construct a Dirty Page Table (DPT) Second, construct an Active Transaction Table. Dirty Page Table consist…
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Data Page and Transaction Log Page
Hey guys, In this blog I am going to explain you about Data Page and Transaction Log Page. Data page- In SQL Server, the page serves as the basic unit of data storage. A collection of eight physically connected pages is referred to as an extent. Extents aid in effective page management. In all SQL…
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DBA Worries Continued DBMS Concepts DBMS Concepts DBMS Concepts High Availability L1 DBA Monitoring My SQL PostgreSQL SQL Server
Mirroring Witness getting disappear from Mirroring Setup…
Recently we have faced one issue where DB mirroring witness getting disappear from mirroring setup. This is happening once Principal get down or SQL services restarts. In the case, we found DB fail-over is also is not working. Once the Principal server come online the DB start serving role as Principal DB and get in…
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Essential SQL Server Topics for Database Administrator
Below are SQL Server topics which are essential for Database Administrator… Server, DB Architecture ○ Server Architecture & Protocols ○ Query Processor & Storage Engine ○ Parser, Optimizer, SQL & DB Manager ○ File Manager and Transaction Services ○ IO & Lock Manager, MDAC, CLR, WAL ○ Buffer Manager, Lazy Writer, SQL OS ○ Linked…
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Contained Database
First introduced in SQL 2012 and its supported now. What it is Contained databases have no dependencies on server-level metadata and settings. User can access a Contained Database without authenticated a login at DB instance level. This helps to isolate the database from database engine and make it possible to easily move the DB from…
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Dive into Buffer pool extension
The Buffer pool extension feature started from SQL server 2014. This is a nice addon to SQL server to extend the memory paging to SSD. This is not an enterprise only feature, this can be enabled on standard edition. The database size has grown huge now the Db’s having size more than 1 TB is…
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