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Temporary table only cached in the memory, it does not to write into the temp dbspace. Requirement from China mobile (CMCC), CMCC use lots of temp table in the following 2 ways: Create temp table ... with no log; select * from tab into temp tabname with no log; there are lots of large temp tables , and the I/O on tempdbspaces is very busy, but the disk is not fast enough to do so much temp I/O, it causes the I/O waiting issue.
New feature: only in-memory temp table there temp table only cached in the memory if the memory (buffer pool) is enough, when drop the temp table, when checkpoint occurs, it does not to write it to disk, just disappear from the server. It can save lots of I/O.
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