SLOWLOG LEN

Introduction and Use Case(s)

The SLOWLOG LEN command is part of the Redis Slow Log feature, used to inspect the length of the slow query log. This log records queries that exceed a certain execution time threshold, allowing administrators to identify and optimize inefficient commands. Typical scenarios include performance monitoring and debugging.

Syntax

  1. SLOWLOG LEN

Parameter Explanations

This command does not take any parameters.

Return Values

The SLOWLOG LEN command returns an integer representing the number of entries in the slow log.

Example Outputs

  • (integer) 0: No slow queries have been logged.
  • (integer) 5: There are five entries in the slow log.

Code Examples

  1. dragonfly> SLOWLOG LEN
  2. (integer) 3

Best Practices

  • Regularly monitor the slow log length to maintain optimal performance.
  • Adjust the slowlog-log-slower-than configuration to define what qualifies as a slow query based on your specific needs.

Common Mistakes

  • Ignoring a high number of entries in the slow log, which may indicate underlying performance issues.

FAQs

How can I clear the slow log?

Use the SLOWLOG RESET command to clear the slow log.

What defines a slow query in Redis?

A slow query exceeds the execution time threshold set by the slowlog-log-slower-than configuration parameter.