"DB Performance Killers: Share Your Worst Migration Stories"

[susligg]

"Hey everyone, I'm still salty about my last migration disaster. I was moving a large MySQL DB to a new hosting platform and somehow managed to kill the performance by 90%. The kicker was when I realized the new servers didn't support InnoDB storage engines, causing a bunch of my queries to fail."

 

[IDios]

"Yikes, I feel your pain, OP. We had a migration nightmare with our MySQL DB a while back. Had to rewrite our queries from scratch and optimize our indexes, which ended up doubling our throughput."

 

[esobko]

"Dude, I had a nightmare when migrating from MySQL to PostgreSQL. Our query times went from ~50ms to ~5 seconds because of a wonky indexing scheme. Had to rebuild the entire table to get it sorted"

 

[yuryazarov]

"Yikes, I feel your pain OP. I once migrated to a sharded DB setup and forgot to update the schema, causing a massive slow down. Took me 2 weeks and a sleepless night to realize I'd accidentally set 2 identical fields as primary keys".

 

[Roverdark]

"Ugh, I've been there too. Migrating to a new DB schema, I forgot to add indexing on a critical table and saw a 90% slowdown in queries. Lesson learned: double-check your schema before the big switch"

 

[toha17_92]

"Yikes, I feel your pain. Did a migration from MySQL to PostgreSQL a few months back and it was a total nightmare. Our query performance tanked for a solid week before we could get it sorted out."