topic Re: ANALYZE table for stats collection in Data Engineering

ANALYZE table for stats collection

noorbasha534 — Sat, 05 Oct 2024 19:12:10 GMT

Hi all,

I understand ANALYZE table for stats collection does not interfere with write & update operations on a delta table. Please confirm.

I like to execute ANALYZE table command post data loads of delta tables but at times the loads could be extended for long hours, and hence like to ensure that there are no conflicts between these 2 processes.

Re: ANALYZE table for stats collection

filipniziol — Sat, 05 Oct 2024 19:21:44 GMT

Hi @noorbasha534 ,

No worries! You can safely run ANALYZE command! Here is a detailed explanation:

Concurrency Between ANALYZE TABLE and Write/Update Operations
1. Delta Lake’s ACID Transactions
Delta Lake provides ACID (Atomicity, Consistency, Isolation, Durability) transactions. This ensures that all operations on Delta tables are transactionally safe and isolated from one another.

2. ANALYZE TABLE Operation
ANALYZE TABLE is a read-only operation. It reads the data to compute statistics but does not modify the data.
Consistent Snapshot: It operates on a consistent snapshot of the data at the time the command is executed. This means it will not include data from ongoing write or update operations that haven't been committed yet.

3. Impact on Write/Update Operations
No Interference: Since ANALYZE TABLE is read-only and operates on a consistent snapshot, it does not interfere with ongoing write or update operations on the Delta table.
Concurrency Support: Multiple read operations (like ANALYZE TABLE) and write operations can safely run concurrently without causing conflicts or data corruption.

Hope it helps!

Re: ANALYZE table for stats collection

noorbasha534 — Sat, 05 Oct 2024 19:26:37 GMT

@filipniziol thanks for your time in replying. your answer is satisfactory & resolves my queries.

Re: ANALYZE table for stats collection

filipniziol — Sat, 05 Oct 2024 19:34:23 GMT

Amazing, happy to help!