According to the document, we know that there is only a subset of data in
memory while the full data set in the disk when persistence enabled. I have
some questions with regards to this point:

Let's say I have a SQL like:
select * from city where provinceId = '1';
1. If some data is in memory while others in the disk,  would ignite query
data from disk? After the query, would those data in the disk be loaded to
the memory?
2. If all data is in the memory, would ignite query data from disk? Or only
query from disk?
3. If all data is in the disk, would ignite query from memory?

4. Is there a document can explain the mechanism in detail?

Looking forward to your reply!




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