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AND '" . strval($todayDate) . "' HAVING COUNT(DISTINCT sys_user_sessions.login_tstamp ) >= 3 EXPECTED RESULTS: test_comunic user Subject Written By Posted SQL queries, select records with specific datatime occurrences (3 per week, 3 days in a row ) ...
in Kafka topics, you would have one offset per partition. For MaterializedMySQL it's not even necessarily linear (there could be holes in a sequence of events, but normally not - this is not necessarily a use-case that needs to be considered though). Maybe...
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Today, many websites use InnoDB for OLTP with Memcached as a caching layer to reduce latency and increase performance. But, Memcached is not ACID and the application is responsible for ensuring that the cached data is consistent with the database of record. ...
Why Are Queries with Many IN Values More Expensive After Upgrading to MySQL 8.x? June 28, 2024 Przemysław Malkowski Some of our Percona Support customers report performance degradation after a major MySQL upgrade, and there can be many different reasons for this. These days, the most common...
Query Analyzer: A Tool for Analyzing MySQL Queries Introduction In today’s world of data-heavy applications, analyzing the performance of database queries is crucial for optimizing performance and improving user experience. MySQL is one of the most popular relational databases, and having a tool th...
The point I’m making is: these queries make assumptions which may hold today, but are not future-proof.Ifthey hold today we have no conscious intention to break them, but one day we unavoidably will, as old code gets refactored, as new SQL features are implemented, as we come clos...
Because MySQL views are just a shortcut to the underlying query, I decided to start by running anexplainon theselect * from teacher_summaries;query. This gave me the following output: I likeexplain, but this was too much. I see there’s a problem in the first row of output (MySQL is...
Does anyone know if its possible to use one dbh (connection) for multiple sth (queries) at the same time in perl with DBI/DBD? Today I use a temptable method which I fill up with the result from up to 20 queries which run one after another. The average time (top) for each query...