QuestionsAnswers

Question 1

How do you diagnose slow queries as load grows?

Type your question

Answer 1

Measure latency and find the bottleneck using traces, query plans and load metrics. Test a hypothesis and compare p95 before and after the change.

•Compare traces and query plans to separate database issues from network latency.

An index reduces scanned rows. Use it for frequent filters; consider memory and slower writes.

•Add an for the actual filter and sort; account for storage and write cost.

A cache speeds up repeated reads. Define TTL and invalidation; monitor hit rate and stale data.

•Repeat the load test and compare p95, errors and memory under the same load.

A transaction keeps multiple changes consistent. Choose isolation with locks and races in mind.

09:41 ▰

59:42

Answers

Answer 1

Measure latency and find the bottleneck using traces, query plans and load metrics. Test a hypothesis and compare p95 before and after the change.

•Compare traces and query plans to separate database issues from network latency.

An index reduces scanned rows. Use it for frequent filters; consider memory and slower writes.

•Add an for the actual filter and sort; account for storage and write cost.

A cache speeds up repeated reads. Define TTL and invalidation; monitor hit rate and stale data.

•Repeat the load test and compare p95, errors and memory under the same load.

A transaction keeps multiple changes consistent. Choose isolation with locks and races in mind.

QQ · RecordCtrl+Q · Screen

QuestionsAnswers

Question 1

How do you diagnose slow queries as load grows?

Type your question

Answer 1

Measure latency and find the bottleneck using traces, query plans and load metrics. Test a hypothesis and compare p95 before and after the change.

•Compare traces and query plans to separate database issues from network latency.

An index reduces scanned rows. Use it for frequent filters; consider memory and slower writes.

•Add an for the actual filter and sort; account for storage and write cost.

A cache speeds up repeated reads. Define TTL and invalidation; monitor hit rate and stale data.

•Repeat the load test and compare p95, errors and memory under the same load.

A transaction keeps multiple changes consistent. Choose isolation with locks and races in mind.

09:41 ▰

59:42

Answers

Answer 1

Measure latency and find the bottleneck using traces, query plans and load metrics. Test a hypothesis and compare p95 before and after the change.

•Compare traces and query plans to separate database issues from network latency.

An index reduces scanned rows. Use it for frequent filters; consider memory and slower writes.

•Add an for the actual filter and sort; account for storage and write cost.

A cache speeds up repeated reads. Define TTL and invalidation; monitor hit rate and stale data.

•Repeat the load test and compare p95, errors and memory under the same load.

A transaction keeps multiple changes consistent. Choose isolation with locks and races in mind.

QQ · RecordCtrl+Q · Screen

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QuestionsAnswers

Question 1

How do you diagnose slow queries as load grows?

Type your question

Answer 1

Measure latency and find the bottleneck using traces, query plans and load metrics. Test a hypothesis and compare p95 before and after the change.

•Compare traces and query plans to separate database issues from network latency.

An index reduces scanned rows. Use it for frequent filters; consider memory and slower writes.

•Add an for the actual filter and sort; account for storage and write cost.

A cache speeds up repeated reads. Define TTL and invalidation; monitor hit rate and stale data.

•Repeat the load test and compare p95, errors and memory under the same load.

A transaction keeps multiple changes consistent. Choose isolation with locks and races in mind.

09:41 ▰

59:42

Answers

Answer 1

Measure latency and find the bottleneck using traces, query plans and load metrics. Test a hypothesis and compare p95 before and after the change.

•Compare traces and query plans to separate database issues from network latency.

An index reduces scanned rows. Use it for frequent filters; consider memory and slower writes.

•Add an for the actual filter and sort; account for storage and write cost.

A cache speeds up repeated reads. Define TTL and invalidation; monitor hit rate and stale data.

•Repeat the load test and compare p95, errors and memory under the same load.

A transaction keeps multiple changes consistent. Choose isolation with locks and races in mind.

QQ · RecordCtrl+Q · Screen

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Interviews
rarely go to plan.

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