postgresql ask for someparameters

hello everyone:
i found database crashed,i checked log,it indicated error:
CONTEXT: xlog redo insert: rel 48777166/22362/48778276; tid 2/2

i wanted to know:what's meaning of real? and what's meaning of
48777166/22362/48778276 ?what's meaning of tid 2/2 ?

please tell me it's meaning or where to find it ?thanks.

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