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Databases incidents

Follow queries, locks, connections, replication, and database safety limits.

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Follow the order or open any challenge. Completed timed and practice attempts both count.

  1. 01

    The transaction that never ended

    PostgreSQL · Starter · 30 min · Free

  2. 02

    A report takes the long way

    PostgreSQL · Starter · 15 min · Individual / Team

  3. 03

    Every lookup scans everything

    PostgreSQL · Intermediate · 1 hr · Free

  4. 04

    Too many connections

    PostgreSQL · Intermediate · 5 min · Free

  5. 05

    Writes wait for a missing witness

    PostgreSQL · Advanced · 4 hr · Individual / Team

  6. 06

    The database safety stop

    PostgreSQL · Advanced · 4 hr · Individual / Team