Thank you for the suggestions. Using a view (since this table is readonly)
is an excellent idea. I will check if this solves my issues. Basically the
logic will be:
1. Create table with some random suffix
2. Import data into that table
3. CREATE OR REPLACE VIEW read_from_here AS SELECT * FROM
write_to_here_12345
4. Drop any old table
On Monday, 12 June 2023 at 20:13:50 UTC+2 Wayne Fuller wrote:
> 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<Throwable, Unit> = 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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