Expand WAL growth troubleshooting guide with detailed diagnostics#3807
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KyleAMathews wants to merge 1 commit intomainfrom
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Expand WAL growth troubleshooting guide with detailed diagnostics#3807KyleAMathews wants to merge 1 commit intomainfrom
KyleAMathews wants to merge 1 commit intomainfrom
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…ostgreSQL settings Add comprehensive guidance for diagnosing and resolving replication slot WAL accumulation issues: - Diagnostic SQL query to check slot health - Explanation of wal_status values (reserved, extended, unreserved, lost) - Common causes: disconnected Electric, slot not advancing, high write volume - Step-by-step verification that changes are flowing through - Recommended PostgreSQL settings (max_slot_wal_keep_size) - Monitoring guidance using Electric's Prometheus metrics - Quick diagnostic checklist https://claude.ai/code/session_01H49sfABH4wS2g45H5nQ89C
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alco
approved these changes
Feb 2, 2026
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Summary
Significantly expanded the "WAL growth" troubleshooting section with comprehensive guidance on diagnosing and resolving replication slot issues. The original brief explanation has been replaced with detailed diagnostic procedures, monitoring strategies, and PostgreSQL configuration recommendations.
Key Changes
Added replication slot status query with explanation of key columns (
active,wal_status,retained_wal,confirmed_flush_lsn)Documented
wal_statusvalues with a reference table explainingreserved,extended,unreserved, andloststates and their implicationsExpanded troubleshooting sections covering three common scenarios:
max_slot_wal_keep_sizeconfiguration)Added PostgreSQL configuration recommendations table with
max_slot_wal_keep_sizeandwal_keep_sizesettings and their purposesIncluded monitoring guidance referencing Prometheus metrics for replication slot health (
slot_retained_wal_size,slot_confirmed_flush_lsn_lag)Added quick diagnostic checklist for users to systematically verify slot health
Notable Details
max_slot_wal_keep_size(invalidation and recreation)https://claude.ai/code/session_01H49sfABH4wS2g45H5nQ89C