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Database

Work through query behavior, serialization issues, transactions, soft deletes, and consistency failures.

Skills trained

  • checkRead query paths
  • checkCheck transaction scope
  • checkValidate consistency

Recommended path

terminalThe N+1 That Wasn't
Mediumchevron_right
terminalInner join drops comments from soft-deleted authors
Easychevron_right
terminalCount that missed the where clause
Easychevron_right
terminalN+1 that silently drops rows
Mediumchevron_right
terminalPagination skips rows on timestamp ties
Mediumchevron_right
terminalPseudo-unique constraint leaks duplicate accounts
Hardchevron_right

Ready incidents

Playable now through the existing challenge engine.

terminalThe N+1 That Wasn't
Mediumchevron_right
terminalThe Query That Loaded the World
Mediumchevron_right
terminalInner join drops comments from soft-deleted authors
Easychevron_right
terminalCount that missed the where clause
Easychevron_right
terminalN+1 that silently drops rows
Mediumchevron_right
terminalPagination skips rows on timestamp ties
Mediumchevron_right
terminalPseudo-unique constraint leaks duplicate accounts
Hardchevron_right

Planned Debugging 50 patterns

Visible for roadmap context only. These entries are not playable.

33Transaction Rollback Missing
Planned
38Soft Delete Filter Missing
Planned
42Search Cursor Reused
Planned
55Database Read Replica Lag
Planned