system.events

    • event (String) — Event name.
    • value () — Number of events occurred.
    • description (String) — Event description.
    2. │ SelectQuery                           │     8 │ Same as Query, but only for SELECT queries.                                                                                                                                                                                                                │
    3. │ FileOpen                              │    73 │ Number of files opened.                                                                                                                                                                                                                                    │
    5. │ ReadBufferFromFileDescriptorReadBytes │  9931 │ Number of bytes read from file descriptors. If the file is compressed, this will show the compressed data size.                                                                                                                                              │
    • — Contains periodically calculated metrics.
    • system.metrics — Contains instantly calculated metrics.
    • — Contains a history of metrics values from tables system.metrics и .
    • Monitoring — Base concepts of ClickHouse monitoring.