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Asked: 2026-05-13T01:22:10+00:00

How do i create a database for scalability? I am in the middle of

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How do i create a database for scalability? I am in the middle of http://www.slideshare.net/vishnu/livejournals-backend-a-history-of-scaling which i cant read ATM and need to leave. But i would like to know more about creating a database that scales well. Somethings that it mentioned and occur in my mind are

  • Separate handles for reads and writes?
  • What happens when one server is busy (IO or CPU bound) and i need two servers to write to?
  • Do i create multiple database? have a clusterId on users?
  • Will it be a problem when moving users to one cluster to another?
  • Might i code this so user ABC in DB A on cluster A and DEF in DB B in cluster B have the same PRIMARY KEY?
  • When i move the above to cluster C? Does this mean i need to write much code to move them to another cluster/database?
  • To make the above not an issue would i NOT use PRIMARY KEY and set the ID by hand by reading the other DBs on other clusters?

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  1. Editorial Team

    What happens when one server is busy (IO or CPU bound) and i need two servers to write to?

    If you are doing a distributed transaction, well you are in trouble so you have to plan ahead to make sure load across your distributed transaction target servers is uniform.

    Do i create multiple database? have a clusterId on users?

    This is a very nice solution :P. You have to get the shared-data data models correct so that you don’t form a bottleneck on your shared catalogue’s

    Will it be a problem when moving users to one cluster to another?

    No, distributed transactions for the win. You need to have a kickass programmer to make sure things happen correctly.

    Might i code this so user ABC in DB A on cluster A and DEF in DB B in cluster B have the same PRIMARY KEY?

    No, assign the primary key on a master RDBMS/LDAP server. You do not want primary-key collisions of this sort. Your chosen method depends on this being done correctly — you want globally unique user-id’s. You will have shared-data in this case, and if you do not have have GU-PK’s how will you relate the user’s to the shared data ?

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