Hi, While hacking on my relation extension patch I found two issues with WAL_LOG:
1) RelationCopyStorageUsingBuffer() doesn't free the used strategies. This means we'll use #relations * ~10k memory 2) RelationCopyStorageUsingBuffer() gets the buffer for the target relation with RBM_NORMAL, therefore requiring a read of a block guaranteed to be zero Easy enough to fix and shows clear improvement. One thing I wonder is if it's worth moving the strategies up one level? Probaly not, but ... Greetings, Andres Freund
