Error Codes
Error codes, crisis symptoms & root-cause resolutions
SQL Server Error 18456: Root Cause by State Code Matrix
In Error 18456, the State code reveals the actual root cause. Specific fixes for State 5, 8, 11, 18, 38, and 40, with ERRORLOG extraction scripts.
SQL Server Error 1205 Deadlock: Graph Extraction and Prevention
Extracting the deadlock graph from the system_health Extended Events ring buffer, understanding victim election, and architectural resolution.
SQL Server Pool Timeout: Connection Pool Exhaustion Fix
Difference between connection pool timeout and query command timeout, detecting connection leaks, and .NET DbContext architectural fixes.
SQL Server Msg 9002: Transaction Log Full Resolution Guide
Decoding log_reuse_wait_desc in Error 9002, tailored resolutions for LOG_BACKUP, ACTIVE_TRANSACTION, and AVAILABILITY_REPLICA, plus VLF tuning.
SQL Server "Cannot open database requested by login" Resolution
Resolving Error 4060 & 18456 State 38/40: deleted default database, offline/restoring status, AUTO_CLOSE traps, and orphan user remediation.
SQL Server 1222 Lock Timeout: Head Blocker Diagnosis
Distinction between Error 1222, 1205 deadlock, and client timeouts, identifying the head blocker session, and RCSI implementation.