What's MultiXactId?

Started by jacktby@gmail.comalmost 3 years ago1 messages

almost 3 years ago

in src/include/access/htup_details.h, I find out this:
#define HEAP_XMAX_IS_MULTI 0x1000 /* t_xmax is a MultiXactId */
what's MultiXactId? Can you give me a scenario to make this bit as 1?

jacktby@gmail.com