SQL Server SQL Server Sleeping Session Blocking: Find the Open Transaction
Find why a sleeping SQL Server session blocks queries. Use DMV checks to inspect open transactions, identify the owner, and choose a safe next step.
Troubleshooting
SQL Server 
Redis Redis CVE-2026-81934: Patch Matrix and DBA Remediation Runbook
Check affected Redis versions, choose the correct fixed release, patch standalone, Sentinel, and Cluster deployments, and verify network and ACL hardening.
MySQL MySQL Error 1045: Fix Access Denied for User
Fix MySQL Error 1045 by checking user@host matching, password use, account locks, authentication plugins, TLS requirements, and exact grants.
Oracle ORA-12154: Fix Could Not Resolve Connect Identifier
Fix ORA-12154 by checking the exact connect identifier, TNS_ADMIN, sqlnet.ora naming methods, tnsnames.ora syntax, and the Oracle client in use.
SQL Server Fix 0x851A001A: Database Engine Recovery Handle Failed
Fix SQL Server setup error 0x851A001A. Read ERRORLOG first, check NVMe sector size with fsutil, and apply the supported 4 KB workaround safely.
SQL Server SQL Server 2025 Performance Regression: Query Store Workflow
Queries slower after a SQL Server 2025 upgrade? Separate engine, compatibility, and environment changes, then use Query Store to find and mitigate regressions.
SQLite SQLite “Database Is Locked”: WAL Mode, busy_timeout, and a Reliable Fix
Diagnose and fix SQLITE_BUSY and “database is locked” with short transactions, WAL mode, busy_timeout, checkpoints, and writer serialization.
SQL Server Fix SQL Server “SSL Security Error” and Native Error 18
A certificate-first workflow for SQL Server SSL Security Error, untrusted certificate chain failures, and Native Error 18 after driver upgrades.
SQL Server Error 665 – The operating system returned error 665(The requested operation could not be completed due to a file system limitation)
QL Server Error 665 occurs when NTFS hits the 256KB ATTRIBUTE_LIST limit. Learn how to confirm it with fsutil and apply proven fixes and workarounds.
SQL Server SQL Server Error 9002: Fix a Full Transaction Log Safely
Fix SQL Server Error 9002 safely by checking log_reuse_wait_desc, log space, autogrowth, active transactions, backups, HA, and replication.