26.4.3.18 The memory_by_user_by_current_bytes and x$memory_by_user_by_current_bytes Views

These views summarize memory use, grouped by user. By default, rows are sorted by descending amount of memory used.

user

The client user name. Rows for which the USER column in the underlying Performance Schema table is NULL are assumed to be for background threads and are reported with a host name of background.
current_count_used

The current number of allocated memory blocks that have not been freed yet for the user.
current_allocated

The current number of allocated bytes that have not been freed yet for the user.
current_avg_alloc

The current number of allocated bytes per memory block for the user.
current_max_alloc

The largest single current memory allocation in bytes for the user.
total_allocated

The total memory allocation in bytes for the user.