Is a SQL database thread-safe?

Question

The CLI for SQL is threadsafe. The introduction of threads does not change the scope of committable transactions. You can scope committable units of work to either a job-level commitment definition or an activation group-level commitment definition.

Are database connections thread-safe?

If the JDBC driver is spec-compliant, then technically yes, the object is thread-safe, but you should avoid sharing connections between threads, since the activity on the connection will mean that only one thread will be able to do anything at a time.

Is SQL update thread-safe?

While it's true that the given query is thread safe, there are plenty of SQL queries that I would personally consider to be a single statement and are not thread safe, like using the MERGE statement to upsert.

Is SQL multithreaded?

If the server computer on which SQL Server is running has multiple CPU's SQL Server can run a single query in parallel using multiple threads. In addition to running user queries on multiple processors SQL Server can also use multiple threads to build indexes.

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