SQL Server Health Check

SQL Server Health Check

sql-server-health-check

Hello there, if you are a SQL DBA the most common task that you perform is “SQL Server Health Check”. You may already have an automated report but this is for doing a quick SQL Server Health Check using native T-SQL. This script helps you in generating HTML report using T-SQL. There are situations where we need to quickly perform SQL Server Health Check:

  • You got a request to check the health of a SQL Server instance
  • When there is a complaint raised against the instance performance
  • When SQL Server restarted
  • Etc.

This SQL Server Health Check Reports:

SQL Server Instance Details: SQL Version, Edition, Service Pack, Processor Type etc.

Error Log: Errors logged into SQL Server error log from Last 4 days

Instance Last Recycle Information: Last recycle time and total uptime information

Tempdb usage: File location and space available information.

CPU Usage: CPU usage information

Memory Usage: Memory usage details

Performance Counters Data: Major performance counter values

Missing Backup Report: Database with no full backup from last 48 hours or without any backup

Connection Information: Host wise connection information

Log Space Usage Report: Log files usage information for all databases. It highlights the value with red color when the percentage use > 80.

Job Status Report: Reports current running jobs information

Blocking Report: Reports blocking information if any

Long running Transactions: Retrieves the long running transactions if any

Most important Note:

There is only one place (Memory Usage Capturing Buffer Pool information) where you need to comment / un-comment out based on the SQL Server version on which this script is running.

Executing:

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Preparing for SQL DBA Interview

Preparing for SQL DBA Interview

Preparing for SQL DBA Interview

This article list out few tips on “Preparing for SQL DBA Interview” If you are reading this article which means you must be a Database Administrator/professional or getting ready for entering into DBA world. In today’s corporate world attending or taking a technical interview is mandatory whether it’s for a new role in current organization, new customer/client or for a new organization. Preparing for SQL DBA Interview is always a challenge. We have randomly chosen SQL Server database professionals from three different experience levels and had a deep discussion on “Preparing for SQL DBA Interview”.

  • Fresher/Junior – Should know the basics of process and technology
  • Mid-Level – Should be able to expertise in one or two areas and know the process
  • Senior Level – Should be expertise in technology and able to drive the process

There are few points everyone should follow to get succeed in an interview. Below are the key points which can be helpful in “Preparing for SQL DBA Interview”

  • Profile

  • Preparation

  • Communication

  • Interview Process

  • Preparing a Topic

Profile

This is the first piece of information that tells about you so please be careful in preparing your profile:

  • Don’t add the generic skill-set: Include only the topics that you are experienced or learned.
  • Add your professional experience, key skills, education details, your achievements, certifications, training and projects.
  • Number of pages should be restricted to 3 or 4.
  • Maintain a profile on professional network like LinkedIn and add a link to your profile (I have seen a lot of opportunities are hitting through professional networks)
  • Remember you should know / learn / prepare / experience each and everything you mentioned in your profile as the interview questions are always depends on summary points that you showcase in your profile.

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Posted in Interview Q&A, Miscellaneous, SQL Server DBA | Tagged , , , , , | 10 Comments

Update Without Where Clause

Update Without Where Clause

Update Without Where Clause

Running Update Without Where Clause might causes a data damage when it is with the critical table that creates a lot of problems and escalations. Recently while working with one of the customer we had a situation where a DBA executed the release script on production and the script contains an update statement without where clause. He immediately realized that he executed an update statement without where clause and he reported us explaining the situation. There were few things we found:

  • The change request implemented on a premium database
  • Update statement provided from Pre-Prod team which is not having any control on that:
    No Where clause
    No Transaction control – Commit / Rollback
    No Validation on update – Validating and Reporting
  • As per the business requirement single record should be updated but in real it updates all records in that table.
  • Usually when a DBA implements a CR on prod server a backup or snapshot has to be taken prior to implementing the change. Since it was a small database (6 GB) he did take a full backup before implementing the CR.

Solution we have provided:

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