When the join happens?

Hi experts,

When any type of join (hash join, merge join), please correct me if I'm wrong, first Oracle have to store all data for the other set of data, right join operation? Where do I store it? PGA is used for this operation? In other words, say that optimizer use the hash join method, (in-memory hash table must be built for this operation), he built in PGA or CMS?

If it's in the PGA, what happens if the sorted data set will not match the memory?

Thank you

basically: Yes.

If the input set is less than the value (explicitly defined or assigned automatically) for hash_area_size, then the hash join is made in memory of the PGA (as best of activities execution). If the game is bigger, it is necessary to empty the intermediate result in TEMP tablespace (causing onepass or operations activities even multipass). Jonathan Lewis described the mechanism in detail cost base fundamental Oracle.

Tags: Database

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