We ae working on a application in which we are using posgresql as a database. We are sure that in future it will extend to level that we have to scale it horizontally. We have some tables which are going to be more than 90% of database size.
I looked at pg_shard, as per my understanding it is for nosql data, in our case we are going to use postgresql RDBMS features without nosql, pg_shard have lot on limitation as per our case.
I looked at postgresql-xl, it looks good as per our requirements, but we have to do a lot of things to make it high availaiblity and it don't have debian packages available for debian.
Now I see BDR, it looks good, it have multimasters, we can start with one master and later we can add more master servers to avoid failover.
Bellow are my queries:-
1. If start with postgresql 9.4 database, later can I upgrade it to DBR with these already large table, can I distribute these tables or shard them. Do I need to do some extra changes in database or it will be complicate later.
2. how can I distribute some of tables on my slave nodes, if it have any limitations please let me know.
3. if I started with 4 or 5 node cluster with one master and rest of slave nodes, how can I take backup of this distributed database to one of my other server or backup location.
Please suggest me what would be the best approch for this.
