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    系统。活动

    包含有关系统中发生的事件数的信息。 例如，在表中，您可以找到多少 自ClickHouse服务器启动以来已处理查询。

    • event () — Event name.
    • value (UInt64) — Number of events occurred.
    • description () — Event description.

    示例

    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.                                                                                                                                              │
    • 系统。asynchronous_metrics — Contains periodically calculated metrics.
    • — Contains instantly calculated metrics.
    • 系统。metric_log — Contains a history of metrics values from tables system.metrics и .
    • — Base concepts of ClickHouse monitoring.