VLF

Get-DbaDbVirtualLogFile

Chrissy LeMaire (@cl), netnerds.net

Get-DbaDbVirtualLogFile View Source Chrissy LeMaire (@cl), netnerds.net Windows, Linux, macOS Synopsis Retrieves detailed virtual log file (VLF) metadata from transaction logs for performance analysis and troubleshooting. Description This function uses DBCC LOGINFO to return detailed metadata about each virtual log file (VLF) within database transaction logs. The output includes VLF size, file offsets, sequence numbers, status, and parity information that’s essential for analyzing transaction log structure and performance. Having a transaction log file with too many virtual log files (VLFs) can hurt database performance.

Measure-DbaDbVirtualLogFile

Chrissy LeMaire (@cl), netnerds.net

Measure-DbaDbVirtualLogFile View Source Chrissy LeMaire (@cl), netnerds.net Windows, Linux, macOS Synopsis Measures Virtual Log File (VLF) counts in transaction logs to identify performance bottlenecks Description Analyzes Virtual Log File (VLF) fragmentation across databases by counting total, active, and inactive VLFs in transaction logs. This function helps identify databases with excessive VLF counts that can severely impact performance. High VLF counts (typically over 50-100) cause transaction log backups to slow down, extend database recovery times, and in extreme cases can affect insert/update/delete operations.