Updating two tables at once guy dating site in bulgaria
Inno DB As you can see the results are very interesting.You can clearly see the difference of both storage engine and transactions (at least for My ISAM).
However, it seems My SQL does some internal optimizations and runs them very efficiently.
In this article, we are going to look at four scenarios for Oracle cross table update. Category_ID) where exists ( select * from Categories b where b. These columns uniquely identify a record in a table.
Suppose we have two tables Categories and Categories_Test. The common column in the two tables is CATEGORY_ID. Please note that query below is used for illustration purpose because Category_ID alone is primary key.
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The CASE method seems to be efficient only for few updates (so you can make a cron job to run updates more frequently), but overall you can see clearly that you can still use transactions and get better results.