Instead of the application reading from the current read_from_here
table, how about creating a view to point to the current read_from_here
table? Then you just have to recreate the view, but the app will just
point at the single view. I would assume you are in full control of
writing to the write_to_here table where then you can control which one
to use for writing.
On 6/12/23 6:43 AM, Axel Möller wrote:
I use H2 in a Spring Boot application with the following h2 config:
jdbc:h2:./my-database;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false;MODE=mysql
I have two tables, called
read_from_here
write_to_here
with identical DDL.
The application only reads from read_from_here.
A long processing job writes new rows to the write_to_here table.
I then want to swap these tables so write_to_here is renamed to
read_from_here.
I attempt to do this with the following query:
@Transactional
fun swap(): Either = Either.catch {
jdbcTemplate.execute("DROP TABLE IF EXISTS read_from_here;
ALTER TABLE write_to_here RENAME TO read_from_here;")
}
I assumed because this runs in a single transaction that the rename is
atomic. But it appears that queries that selects from read_from_here
fail during the swap because read_from_here no longer exists during a
brief period.
How should I perform an atomic rename of the tables so there is no
downtime?
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