user_processes

此系统表可用于获取用户内存使用情况和 ProfileEvents 的概述。

列

• user (字符串) — 用户名。
• memory_usage (Int64) – 用户所有进程使用的 RAM 总和。它可能不包含某些类型的专用内存。请参阅 max_memory_usage 设置。
• peak_memory_usage (Int64) — 用户内存使用的峰值。当用户没有运行任何查询时，它可以重置。
• ProfileEvents (Map(字符串, UInt64)) – 测量用户不同指标的 ProfileEvents 摘要。可以在表 system.events 中找到它们的描述。

SELECT * FROM system.user_processes LIMIT 10 FORMAT Vertical;

Row 1:
──────
user:              default
memory_usage:      9832
peak_memory_usage: 9832
ProfileEvents:     {'Query':5,'SelectQuery':5,'QueriesWithSubqueries':38,'SelectQueriesWithSubqueries':38,'QueryTimeMicroseconds':842048,'SelectQueryTimeMicroseconds':842048,'ReadBufferFromFileDescriptorRead':6,'ReadBufferFromFileDescriptorReadBytes':234,'IOBufferAllocs':3,'IOBufferAllocBytes':98493,'ArenaAllocChunks':283,'ArenaAllocBytes':1482752,'FunctionExecute':670,'TableFunctionExecute':16,'DiskReadElapsedMicroseconds':19,'NetworkSendElapsedMicroseconds':684,'NetworkSendBytes':139498,'SelectedRows':6076,'SelectedBytes':685802,'ContextLock':1140,'RWLockAcquiredReadLocks':193,'RWLockReadersWaitMilliseconds':4,'RealTimeMicroseconds':1585163,'UserTimeMicroseconds':889767,'SystemTimeMicroseconds':13630,'SoftPageFaults':1947,'OSCPUWaitMicroseconds':6,'OSCPUVirtualTimeMicroseconds':903251,'OSReadChars':28631,'OSWriteChars':28888,'QueryProfilerRuns':3,'LogTrace':79,'LogDebug':24}

1 row in set. Elapsed: 0.010 sec.