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Postgres Said Too Many Clients While Sitting at 40% CPU

The error was FATAL: sorry, too many clients already , thrown by a Postgres instance that, by every dashboard we had, was using 40% of its CPU and half its RAM. Plenty of headroom.

  • Postgres rejected connections due to too many existing clients
  • 97 active connections nearing maxconnections limit of 100
  • PgBouncer fixed issue by pooling app connections

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