Hi, all:
I am confusing with seconds_behind_master, in mysql manual, it says:
In essence, this field measures the time difference in seconds between the
slave SQL thread and the slave I/O thread.
how to understand this description:
1. seconds_behinds_master = ts in SQL thread - ts in I/O thread,
On 10/28/2011 3:38 PM, jiangwen jiang wrote:
Hi, all:
I am confusing with seconds_behind_master, in mysql manual, it says:
In essence, this field measures the time difference in seconds between the
slave SQL thread and the slave I/O thread.
how to understand this description:
1.
On 28 Oct 2011, at 10:03, 王科选 wrote:
According to High performance mysql,
seconds_behinds_master is inaccurate, so I just skipped how it works...
If you want to measure slave lag, follow that book's suggestion:
One good solution is a heartbeat record,which is a timestamp that you update
someone say:
seconds_behinds_master = time in I/O thread - time in SQL thread
time in I/O thread is current timestamp,
time in SQL thread is the timestamp record in binlog, this binlog is
originates from
master, so it is the timestamp when binlog is generated in master.
Is this correct?
