Definition: The '._pg_hba_rule.conf' line in MySQL configuration file defines rules to specify connections that can connect to each other.
Definition:
- '_': Character used as a separator between lines. It's typically represented by "\n".
- 'pg_hba': Parameter for specifying host and port boundaries.
- 'rule': A set of conditions that determines the type of connection allowed or denied.
- 'conf': The configuration file. It contains a set of rules that can be used to control connections.
Example:
```bash
# Create new connection
CREATE CONNECTION (host, port)
NAME USER PASS
127.0.0.1 localhost DEFAULT 'root'
# Create host with specific parameters
CREATE HBA (host, port)
NAME HBA PASS
localhost localhost DEFAULT 'root'
```
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