What's MultiXactId?

From: "jacktby(at)gmail(dot)com" <jacktby(at)gmail(dot)com>
To: pgsql-hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>
Subject: What's MultiXactId?
Date: 2023-03-03 12:37:48
Message-ID: 202303032037474395722@gmail.com
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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(at)gmail(dot)com

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