Dhananjay Chaudhari

Senior SQL Server Database Administrator with 9+ years of experience in designing, managing, and optimising enterprise database environments. Currently at Ventra Health, I drive high-availability solutions, performance tuning, and database governance to ensure seamless business operations.

I specialise in:

Database Operations Leadership – Streamlining processes through SOPs for Incident, Change, and Access Management.

Performance & Automation – Enhancing SQL Server performance, implementing automation, and reducing downtime through proactive monitoring and tuning.

Strategic Impact – Translating database insights into business value by improving operational KPIs and supporting critical decision-making.

Beyond technical expertise, I am passionate about mentoring teams, establishing scalable processes, and aligning IT initiatives with organisational growth. My career vision is to advance into a Leadership role, driving end-to-end data strategy, governance, and digital transformation initiatives
  • Interests: SQL Server Performance Tunning, High Avalibiltiy and Disaster Recovery
  • Jobs: Sr. DBA
  • Skills: MSSQL Server DBA, Performance Tunning

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Adding new column with DEFAULT II

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Question of the Day

Adding new column with DEFAULT II

Which number did the two COUNT(*) return: 

DROP TABLE IF EXISTS #tmp
CREATE TABLE #tmp (id INT NOT NULL)

INSERT INTO #tmp (id) 
SELECT gs.value
  FROM GENERATE_SERIES(1, 5) AS gs

ALTER TABLE #tmp ADD my_value INT NOT NULL CONSTRAINT df_tmp_my_value DEFAULT 1

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

ALTER TABLE #tmp DROP CONSTRAINT df_tmp_my_value

ALTER TABLE #tmp ADD CONSTRAINT df_tmp_my_value DEFAULT 2 FOR my_value

SELECT COUNT(*)  FROM #tmp AS t WHERE my_value = 1

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