Database management systems notes

Application-Level Performance

N+1 queries, pooling, batching and pagination, the costs that never show up in a plan. Every section is a drawn page beside a clear written explanation, about 19 minutes in all.

  • Chapter 26 of 34
  • About 19 minutes
  • 5 sections

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The first drawn page of Application-Level Performance: The N+1 query problem
The chapter's first page: The N+1 query problem

In this chapter

  • The N+1 query problem
  • Connections are expensive
  • Round trips, and batching them away
  • Pagination that does not degrade
  • Caching, and failing fast

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