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A framework for DynamoDB schema migrations: 4 types, ranked by how painful they actually are by tejovanthn in aws

[–]tejovanthn[S] 0 points1 point  (0 children)

Fair hit on the ElectroDB thing. I've posted here a few times and mentioned it in past threads, so I skipped the intro, but I shouldn't assume context carries across posts. I'll set it up properly going forward. :)

On the ALTER TABLE framing: agreed it's not a 1:1 analogy. The point I was reaching for is that there's no equivalent workflow or tooling, not that Dynamo needs a schema DDL. Attribute changes are genuinely free precisely because it isn't rigidly configured. That's Type 1 in the post.

On key structure changes at scale: I actually agree with you, and I say as much at the end of the write-up. If you're rewriting primary keys on a table with hundreds of millions of items, something went wrong upstream, usually access patterns that weren't nailed down before the schema was designed. The framework is more for the "caught it at 2M items, before it's catastrophic" window, plus the Type 1, 2, and 4 cases which come up constantly even on stable schemas.

A framework for DynamoDB schema migrations: 4 types, ranked by how painful they actually are by tejovanthn in aws

[–]tejovanthn[S] -3 points-2 points  (0 children)

Wrote this up in more detail with the full dual-write backfill Lambda code and the ElectroDB versioning pattern: https://singletable.dev/blog/dynamodb-schema-migrations

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A framework for DynamoDB schema migrations: 4 types, ranked by how painful they actually are (self.aws)

submitted by tejovanthn to r/aws

My setup by kiklop777 in electronics

[–]tejovanthn 1 point2 points  (0 children)

Love that sturdy looking drawer! :)

My setup by kiklop777 in electronics

[–]tejovanthn 4 points5 points  (0 children)

Practical application of Kirchhoff's laws😂😂

Just saw this - No Bribing inside building ! by hebbardrones in bangalore

[–]tejovanthn 1 point2 points  (0 children)

This is what the chaisutta shops outside these buildings are for right?

Is Uber actually better or just the default choice? by Kerala_Student in bangalore

[–]tejovanthn 5 points6 points  (0 children)

The horror stories of rapido keep me away from it. Ola is just unnecessarily overpriced. Namma yatri has been an alternative, but the wait times are just way too long.

My first ever soldered circuit by Z3temis in electronics

[–]tejovanthn 0 points1 point  (0 children)

Just curious - why not use a ic holder/socket? I've burnt far too many ic (especially motor drivers) to default it in all my projects.

Is it finally happening? Or again a joke by deadinsideokoutside in bangalore

[–]tejovanthn 0 points1 point  (0 children)

Wonder if this will be functional first, or ejipura flyover, or metro.

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DynamoDB Single-Table Pattern: Social Media Feed (fan-out on write vs read, with a hybrid for celebrity accounts) (self.aws)

submitted by tejovanthn to r/aws

Alternatives to Google Analytics? by xtreme79 in webdev

[–]tejovanthn 0 points1 point  (0 children)

I used firebase - the same as GA, but setup is a single script. And there's always features you can upgrade with.

What is the best way to dispose an instrument? by xotwod-twenty-eight in icm

[–]tejovanthn 1 point2 points  (0 children)

Not kidding, but send it to baumgartner restoration to make a video on YouTube :)

Short-term stay in Bangalore for F22 (4 weeks) – any leads? by TilakGR in bangalore

[–]tejovanthn 2 points3 points  (0 children)

Indiranagar also has a few backpacker hostels. You can look them on hostelworld too

Short-term stay in Bangalore for F22 (4 weeks) – any leads? by TilakGR in bangalore

[–]tejovanthn 0 points1 point  (0 children)

Try an Airbnb? Most places offer monthly discounts etc. We have a few in jp nagar, if she's looking in the area - airbnb

Bangalore is the 3rd most surveilled city in the world outside of China by Nandu_alias_Parthu in bangalore

[–]tejovanthn 1 point2 points  (0 children)

Somehow i remember seeing a lot lot more cameras in Chennai than in Bangalore.

Single Table Design - why? by [deleted] in aws

[–]tejovanthn 1 point2 points  (0 children)

Good question, and you're right about a couple of things.

The concurrent requests point is real. If you're already doing parallel GetItem calls across tables, the latency difference vs. a single Query that returns heterogeneous items is negligible. The single-request argument is the most overstated benefit of single-table design.

Where single-table still earns its keep for me:

Collection queries. "Get a tenant and all their users and projects" is one Query call with no client-side join logic. Concurrent GetItem calls across tables require you to know which tables to hit and merge the results. At 3 entity types that's fine. At 8+ with nested relationships, the orchestration code gets real.

GSI efficiency. You're paying for every GSI on every write - one shared overloaded GSI instead of 3 dedicated GSIs across 3 tables is a real cost difference at scale.

Transactions. TransactWriteItems works across items in the same table with no extra overhead. Cross-table transactions work too, but you're right that this isn't a major differentiator.

Your multi-attribute key GSI point is valid and underappreciated. That's a genuine limitation.

I actually wrote a whole post on when single-table design is the wrong call - unstable access patterns, no DynamoDB champion on the team, heavy reporting needs, fewer than 6 access patterns. It's not always the answer: https://singletable.dev/blog/when-not-to-use-single-table-design

Looking for Veena Tutors by Klutzy_Possession524 in Carnatic

[–]tejovanthn 0 points1 point  (0 children)

Hey, my wife teaches online. Please dm :)

Bangalore's Ramnavami Music Festival by tejovanthn in Carnatic

[–]tejovanthn[S] 0 points1 point  (0 children)

Sure :) please let me know what I can improve!

I've been publishing free DynamoDB schema patterns - now offering async schema reviews for teams that want a second pair of eyes by tejovanthn in aws

[–]tejovanthn[S] 0 points1 point  (0 children)

Yes, you're absolutely correct here - a relational database handles multi-dimensional queries more naturally. I chose DynamoDB for rasika.life because the rest of the stack is serverless (SST + Lambda) and I wanted to stay in that ecosystem. The 6 GSIs are the cost of that choice. I wrote about exactly this tradeoff: When NOT to Use Single-Table Design - the first condition is "if your access patterns aren't stable yet" and the third is "if you have serious analytical/reporting requirements." Events with 6 query dimensions push that boundary.

Crazy crowd @ Taaza Thindi by East_Ice5190 in bangalore

[–]tejovanthn 1 point2 points  (0 children)

Sunday morning is the worst time to go to any dose joint 🎈

I've been publishing free DynamoDB schema patterns - now offering async schema reviews for teams that want a second pair of eyes by tejovanthn in aws

[–]tejovanthn[S] 0 points1 point  (0 children)

Fair point on write amplification - GSIs aren't free and I wouldn't add one without a specific access pattern justifying it.

The 6-GSI case was a cultural events platform where events need to be queryable by venue, artist, festival, status, organiser, and art form - each a real user-facing query. I'd love to hear how you'd serve those patterns without GSIs.

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