Franck Pachot

🥑 Developer Advocate at 🍃 MongoDB, 🔶 AWS Data Hero, 🐘 PostgreSQL fan,▝▞ YugabyteDB expert, 🅾️ Oracle Certified Master, and 💚 loving all databases 🛢️

Lausanne, Switzerland Joined on Nov 12, 2018 https://www.linkedin.com/in/franckpachot

Education

Master MIAGE, Université Paris-Sud, France

Work

Developer Advocate at MongoDB

Pinned

Franck Pachot for MongoDB

May 23

Intro to PostgreSQL with JSONB compared to MongoDB, a general purpose document database

#postgres #mongodb #json #document

2 min read

Franck Pachot for MongoDB

Apr 13

MongoDB With Search Indexes Queried as Kimball's Star Schema With Facts and Dimensions

#mongodb #search #index #analytics

10 min read

Franck Pachot

Jul 10

Wildcard Indexes: MongoDB flexibility joins query performance

#mongodb #document #database #index

5 min read

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Franck Pachot

Jul 8

ALTER TABLE ... ADD COLUMN

#postgres #mongodb #database #performance

12 min read

Franck Pachot for MongoDB

Jun 30

Strong consistency 👉🏻 MongoDB highly available durable writes (Replication)

#mongodb #acid #consistency #database

11 min read

Franck Pachot for MongoDB

Jun 28

Flush to disk on commit 👉🏻 MongoDB durable writes (ACID)

#mongodb #document #database #acid

9 min read

Franck Pachot for MongoDB

Jun 24

No pre-filtering in pgvector means reduced ANN recall ( impact on Vector Search accuracy)

#postgres #vector #database #mongodb

12 min read

Franck Pachot for MongoDB

Jun 22

faster $lookup after $group in MongoDB aggregation pipeline (Performance Optimization Tips)

#mongodb #lookup #join #performance

2 min read

Franck Pachot for MongoDB

Jun 19

One million $lookup challenge (performance comparison)

#mongodb #document #database #join

6 min read

Franck Pachot for MongoDB

Jun 17

$lookup: more than just a SQL join (understand performance)

#mongodb #document #database #sql

5 min read

Franck Pachot for MongoDB

Jun 15

Queries on JSON 👉🏻 compound indexes (Equality, Sort, Range) in MongoDB

#mongodb #document #postgres #json

8 min read

Franck Pachot for MongoDB

Jun 13

DuckDB to query MongoDB

#postgres #mongodb #duckdb #analytics

11 min read

Franck Pachot for MongoDB

Jun 9

Comparison of JOINS 👉🏻 aggregation pipeline and CTEs

#mongodb #lookup #join #aggregation

7 min read

Franck Pachot for MongoDB

Jun 9

"Schema Later" considered harmful 👉🏻 schema validation (enforced data consistency)

#mongodb #document #database #postgres

3 min read

Franck Pachot for MongoDB

Jun 6

Isolation Level for MongoDB Multi-Document Transactions (Strong Consistency)

#mongodb #document #database #acid

11 min read

Franck Pachot for MongoDB

Jun 4

JSONB DeTOASTing (read amplification) when using PostgreSQL as a Document Database

#postgres #jsonb #document #database

5 min read

Franck Pachot for MongoDB

May 31

No HOT updates on JSONB (write amplification) performance impact

#postgres #document #database #mongodb

7 min read

Franck Pachot for MongoDB

May 29

$graphLookup (Connect By / Recursive Query)

#mongodb #document #database #index

2 min read

Franck Pachot for MongoDB

May 28

$elemMatch and Multi-Key Indexes

#mongodb #document #database #index

4 min read

Franck Pachot

May 27

Google Firestore with MongoDB compatibility - index limitations

#mongodb #database #index #firestore

6 min read

Franck Pachot for MongoDB

May 27

Sort on Array with Multi-Key Index

#mongodb #document #database #index

5 min read

Franck Pachot for MongoDB

May 26

Equality with Multiple Values, Preserving Sort for Pagination

#mongodb #database #index #performance

5 min read

Franck Pachot for MongoDB

May 24

No Index for LIKE on JSONB with Array in the Path (GIN limitation)

#mongodb #postgres #database #index

5 min read

Franck Pachot for MongoDB

May 23

B-Tree for Equality, Sort, Range (indexing strategies in MongoDB)

#mongodb #database #index #performance

3 min read

Franck Pachot for MongoDB

May 23

No Index Only Scan on JSONB Fields (even on scalar)

#postgres #mongodb #json #document

4 min read

Franck Pachot for MongoDB

May 22

Search Index for Reporting

#mongodb #database #index #performance

2 min read

Franck Pachot for MongoDB

May 22

Sampling Without Index

#mongodb #database #index #performance

2 min read

Franck Pachot for MongoDB

May 22

Indexing for New Use Cases Within the MongoDB Document Model (tutorial)

#mongodb #database #index #performance

3 min read

Franck Pachot for MongoDB

May 6

HTAP Using a Star Query on MongoDB Atlas Search Index

#mongodb #htap #olap #database

14 min read

Franck Pachot for AWS Heroes

May 5

Amazon DocumentDB and multi-key indexing

#mongodb #aws #documentdb #index

8 min read

Franck Pachot for AWS Heroes

May 4

Amazon DocumentDB != Microsoft DocumentDB extension for PostgreSQL

#documentdb #aws #azure #mongodb

3 min read

Franck Pachot

May 1

Microsoft CosmosDB: RUM instead of GIN but same limitations on JSON paths

#mongodb #postgres #document #database

15 min read

Franck Pachot

Apr 30

Querying embedded arrays in JSON (PostgreSQL JSONB and MongoDB documents)

#postgres #json #sql #mongodb

5 min read

Franck Pachot for AWS Heroes

Apr 28

PostgreSQL aborts the transactions on error

#postgres #sql #database #savepoint

3 min read

Franck Pachot for MongoDB

Apr 27

Index Only Scan on JSON Documents in MongoDB, with covering and multi-key indexes

#database #index #webdev #programming

10 min read

Franck Pachot for MongoDB

Apr 15

PostgreSQL JSONB Indexing Limitations with B-Tree and GIN

#postgres #gin #btree #jsonb

8 min read

Franck Pachot

Apr 11

Oracle Multi-Value Index and ORDER BY Pagination queries

#mongodb #oracle #multivalue #oson

6 min read

Franck Pachot for MongoDB

Apr 6

Where SQL joins struggle but MongoDB documents shine

#mongodb #postgres #sql #database

9 min read

Franck Pachot for MongoDB

Apr 3

Foreign Keys: A must in SQL, but not in a Document Database?

#mongodb #sql #database #postgres

7 min read

Franck Pachot for MongoDB

Mar 31

The World Is Too Messy for SQL to Work

#sql #database #relational #document

10 min read

Franck Pachot for MongoDB

Mar 26

MongoDB Vector Search Index, With Local Atlas and Ollama

#mongodb #vectordatabase #llm #ai

4 min read

Franck Pachot for MongoDB

Mar 24

MongoDB TTL and Disk Storage

#mongodb #ttl #index #database

4 min read

Franck Pachot for MongoDB

Mar 19

MongoDB equivalent for PostgreSQL JSONB operations

#postgres #mongodb #document #database

12 min read

Franck Pachot for MongoDB

Mar 17

Normalization and Relational Division in SQL and MongoDB

#mongodb #sql #relational #database

7 min read

Franck Pachot for MongoDB

Mar 13

MongoDB Multi-Planner Optimizer and Plan Cache

#mongodb #database #optimizer #planner

13 min read

Franck Pachot for MongoDB

Mar 9

Comparing Execution Plans: MongoDB vs. Compatible APIs

#mongodb #oracle #database #index

6 min read

Franck Pachot for MongoDB

Feb 27

Order-preserving or-expansion in MongoDB and $in:[,,] treated as a range skip scan, or exploded to an equality for the ESR rule

#postgres #index #sort #webdev

5 min read

Franck Pachot for MongoDB

Feb 27

Skip Scan in MongoDB with Range, Equality (RE) index as an alternative to Equality, Sort, Range (ESR)

#mongodb #database #indexing #webdev

4 min read

Franck Pachot for MongoDB

Feb 11

MongoDB Equality, Sort, Range (ESR) without Equality (SR): add an unbounded range predicate on the indexed sort field

#mongodb #indexing #database #webdev

5 min read

Franck Pachot for AWS Heroes

Feb 9

Aurora DSQL is different than Aurora, but Aurora DSQL belongs to Aurora (which belongs to RDS)

#aws #rds #aurora #postgres

3 min read

Franck Pachot

Feb 8

Document Expiration with TTL Indexes in MongoDB

#mongodb #ttl #index #metrics

8 min read

Franck Pachot

Feb 6

My Journey to NoSQL and Document Databases

#mongodb

1 min read

Franck Pachot for YugabyteDB

Feb 5

UUIDv7 in YugabyteDB

#yugabytedb #distributed #postgres #sql

2 min read

Franck Pachot for YugabyteDB

Jan 30

⛔ ORDER BY in Subquery

#yugabytedb #distributed #postgres #sql

7 min read

Franck Pachot for YugabyteDB

Jan 29

set parameter if exists

#yugabytedb #postgres #distributed #database

1 min read

Franck Pachot for YugabyteDB

Jan 26

ESR (Equality, Sort, Range) rule applied to YugabyteDB and PostgreSQL indexes

#yugabytedb #postgres #index #mongodb

11 min read

Franck Pachot for AWS Heroes

Jan 24

Indexing for NOT EQUAL (<>,!=) in YugabyteDB, PostgreSQL, Oracle Database, SQL Server, and MongoDB

#mongodb #oracle #postgres #yugabytedb

13 min read

Franck Pachot for YugabyteDB

Jan 22

PostgreSQL 15 Compatibility in YugabyteDB 2.25: Top 15 Features!

#yugabytedb #postgres #distributed #sql

8 min read

Franck Pachot

Jan 20

PostgreSQL Synchronized Sequential Scans and LIMIT without an ORDER BY

#postgres #sql #database #fullscan

3 min read

Franck Pachot for YugabyteDB

Jan 17

Aggregates with NULL: count(), min(), max(), sum()

#postgres #sql #database #yugabytedb

3 min read

Franck Pachot for YugabyteDB

Jan 16

What does NULL mean in an OUTER JOIN? ("unknown" vs. "not exists")

#yugabytedb #distributed #postgres #sql

4 min read

Franck Pachot for YugabyteDB

Jan 14

PostgreSQL plan_cache_mode

#yugabytedb #postgres #distributed #sql

6 min read