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If the PostgreSQL version and architecture is the same on the target so they're binary compatible: Set up streaming replication with WAL archive fallback, so the new host replicates from the old one. Enable hot_standby mode so you can connect to the new host read-only. Test. Then when you're ready to cut over, stop the old server and pg_ctl promote the new ...


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Reason: Is it the same version of Mongo on both servers? Record Padding : http://docs.mongodb.org/v2.4/core/record-padding/ No Padding Allocation Strategy Changed in version 3.0.0. For collections whose workloads do not change the document sizes, such as workloads that consist of insert-only operations or update operations that do not increase document ...



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