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1. horizontal scaling - same table distributed across servers some rows on one server ans some rows on other.
Adv - data growth easily handled.
disadv - data is not evenly distributed.
2. vertical scaling - tables are grouped into server as some tables on server 1 and some on server
adv - data is evenly distributed.
disadv - data growth handling difficult.
3. directory based partition - key value pair for storing data and its location. ??????
Partition criteria -
1. hash based - data is hashed and assigned to a db server.
2. list based - each partition is assigned a list of values and a recored is assigned a partition according to its values.
3. round robin -
4. composite partition - combination of above methods.
Problems of sharding -
1.joins and normalization -
2. referential integrity -
3. rebalancing -
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