We know WAL file locate in the $PGDATA/pg_xlog directory, but I don't know the meaning of WAL file ,such as a WAL file which named "0000000A00005283000000E0",
I see some's blog say WAL file name respect a format name subdivided into 3 sequences of 8 hexa digits defining:
Timeline ID
Block ID
Segment ID
But I still don't understand this. anyone can explain this?
--query
francs=> select pg_current_xlog_location();
pg_current_xlog_location
--------------------------
5283/D9C2A320
(1 row)
francs=> select pg_xlogfile_name(pg_current_xlog_insert_location());
pg_xlogfile_name
--------------------------
0000000A00005283000000E0