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Data Load in Synapse Table?

Cloud/Toolsmedium0.6 min readPremium

Architectural logic: Synapse is MPP—distribution and indexing dictate load and query performance. COPY INTO is the native bulk path; ADF Copy Data supports it via PolyBase or bulk INSERT. Why COPY INTO: Reads from external stage (Blob/ADLS); parallel load across distributions;...

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Frequency
Low
Asked at 1 company
Category
179
questions in Cloud/Tools
Difficulty Split
104E|27M|48H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Deloitte
Interview Pro Tip

Red Flag: Loading via INSERT…SELECT without distribution strategy. Pro-Move: 'We use COPY INTO from staged Parquet with distribution on order_id—10TB loads in 2 hours; we tuned via DMVs.'

Key Concepts Tested
join

Why This Question Matters

This medium-level Cloud/Tools question appears frequently in data engineering interviews at companies like Deloitte. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (join) will help you answer variations of this question confidently.

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Break this problem into components. Identify the core trade-offs involved, then walk the interviewer through your reasoning step by step. Demonstrate awareness of edge cases and production considerations - this is what separates good answers from great ones.

Expert Answer
111 words

Architectural logic: Synapse is MPP—distribution and indexing dictate load and query performance. COPY INTO is the native bulk path; ADF Copy Data supports it via PolyBase or bulk INSERT. Why COPY INTO: Reads from external stage (Blob/ADLS); parallel load across distributions; minimal log overhead. Scalability: Distribution key choice matters—hash on join keys for fact tables; round-robin for staging. CCI vs HEAP: CCI for analytics (column-store); HEAP for staging or small tables. Cost: COPY INTO is cheaper than row-by-row INSERT; staging in Blob avoids loading raw into Synapse first. Best practice: Stage Parquet in Blob → COPY INTO with FILE_TYPE=PARQUET, CREDENTIAL=Managed Identity; distribute large facts on join keys; use sys.dm_pdw_exec_requests to tune.

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