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Home/Questions/Cloud/Tools/Explain how AWS Glue interacts with on-premises SQL databases to extract data efficiently.

Explain how AWS Glue interacts with on-premises SQL databases to extract data efficiently.

Cloud/Toolsmedium0.3 min read

Reviewed by Aditya Kumar · Last reviewed 2026-03-24

Architectural logic: Glue runs in AWS; connector/agent in on-prem network proxies connection. Efficient extraction: (1) Pushdown—filter at source. (2) Partition-based extract (date). (3) Incremental via bookmarks/watermark. (4) Parallel reads by splitting on numeric key. Why:...

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Part of the SQL Query Optimization & Indexing Interview Preparation Hub
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Key Concepts Tested
partitionsql
Expert Answer
56 words

Architectural logic: Glue runs in AWS; connector/agent in on-prem network proxies connection. Efficient extraction: (1) Pushdown—filter at source. (2) Partition-based extract (date). (3) Incremental via bookmarks/watermark. (4) Parallel reads by splitting on numeric key. Why: Full scans over WAN are slow and expensive. Best practice: Connector in same network as DB; connection pooling; always use predicates.

⚡
Pro Tip

Red Flag: Full table extract when incremental is possible. Pro-Move: 'We use bookmark on updated_at; pushdown WHERE; 10 partitions—extract 50M rows in 15 min vs 2 hours full.'

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