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I implemented a system that leads to a lot of holes in Postgresql generated sequence values. I just wanted to ask if this can cause some reduction in performance?
If possible please include a reference where I can do further reading thanks.
Don’t worry. There won’t be any influence on performance.
The main reason is that numbers (integer, bigint) are stored with a fixed amount of storage. So there is no differenc in storage or runtime overhead whether an ID holds the value 42 or 38643874638
Also: holes in sequences can not be avoided. As a primary key is just “some value” they don’t matter either.
Storage requirements of integers: http://www.postgresql.org/docs/current/static/datatype-numeric.html#DATATYPE-INT