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PostgreSQL replication with fsync disabled?

I need to run PostgreSQL in-memory (for performance reasons), so I intend to disable fsync, which means that no writes will be sent to the WAL. However, as part of my scheme to meet another ...
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How much RAM should you allocate a MySQL replication slave?

Our MySQL master is allocated 24GB of RAM (innodb_buffer_pool_size = 24GB), but was curious if there was some standard amount to allocate to a replication slave? Right now the slave is just used to ...