Lost update

  • Fix
  • Quorum 16

Difficulty 3 of 5

Stock is 10. Bo reads it. Ada then locks the row, sells 3 and saves 7. Bo sells 2 and saves 8 over it. Only Ada's code takes a lock. Stop one sale from overwriting the other. The code of both editors stays as it is.

0:00. Stock reads 8 after sales of 3 and 2. Graph: stock goes 10, 7, then back up to 8.

Play level

SQLUsers100 req/sPostgres1 vCPU · 1 GB
SQLUsers100 req/sPostgres1 vCPU · 1 GB
The board at the start of the level
An order and its event commit togetherTap to turn the outbox on or off

Outbox · 10 orders · 10 events · 0 lost

Goals and limits

Lost updates
none
Dirty reads
none
Monthly cost
under 20 USD/mo
Edit limit
2
Traffic
100 req/s

Concepts

How players did

Player results load from the server.

All levels