In this chapter, we will cover the following recipes:
- Checking whether a user is connected
- Checking which queries are running
- Checking which queries are active or blocked
- Knowing who is blocking a query
- Killing a specific session
- Detecting an in-doubt prepared transaction
- Knowing whether anybody is using a specific table
- Knowing when a table was last used
- Usage of disk space by temporary data
- Understanding why queries slow down
- Investigating and reporting a bug
- Producing a daily summary of log file errors
- Analyzing the real-time performance of your queries
