In general pattern of generic WAL usage is following.
1) Start using generic WAL: specify relation
M-m, what about extensions which wants to use WAL but WAL record doesn't
connected to any relation? For example, transaction manager or kind of FDW.
GenericXLogStart(index);
2) Register buffers
GenericXLogRegister(0, buffer1, false);
GenericXLogRegister(1, buffer2, true);
first argument is a slot number, second is the buffer, third is flag indicating
new buffer
Why do we need a slot number? to replace already registered buffer?
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Teodor Sigaev E-mail: teo...@sigaev.ru
WWW: http://www.sigaev.ru/
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