This is really a defective redesign. It reintroduced numeric IDs to be

removed by T114902. See also T179928. We should reconsider reintroduce a new table to link unperfixed and perfixed entity ID.

The new schema has been optimized as much as possible to allow maximum scalability as it will contain a massive amount of data that we hope it doubles or even triple in size as soon as we can. The ids changed here to integer as we have seperate tables at the top level and prefixes in those tables are redundant and only take up redundant space that accumulate to big amount very quickly.

The old `wb_terms`, as well as the new schema, are not actually design for public use unless really necessary for your needs. If your needs can be addressed via Wikidata available APIs, you are very much encourage to switch to using those instead. In that case, you need not to worry about migrations and schema changes ever.

Also oppose any "partial migration for first XXX items" process in

T221765: this makes queries much more complicated. Please first fill all data in the new schema, then discontinue the old table.

Full migration is not possible unfortunately due to the current capacity of database master node. We tried to find a trade-off between the overhead we introduce to both disk usage and application logic complexity that will access those schemas.

This will make our life at Wikidata also a little less pleasant for the migration period. We understand this is unusual migration and isn't a very easy one for a little while, that's why we want to help out with those queries and other inquiries as much as we can.

If you have some queries you are running on `wb_terms`, it would of great help if you add them to a new Phab task on the Tool Builders migration board, in the Backlog column. https://phabricator.wikimedia.org/project/view/4014/

If you have any concrete suggestions regarding making this migration easier, we would also love to hear them. Please go ahead and add them on the same board in their own Phabricator tasks so that we can keep track of things more easily and follow up on them as soon as possible.

On Thu, 25 Apr 2019 at 15:25, data_querier data_querier@protonmail.com wrote:

This is really a defective redesign. It reintroduced numeric IDs to be removed by T114902. See also T179928. We should reconsider reintroduce a new table to link unperfixed and perfixed entity ID.

Also oppose any "partial migration for first XXX items" process in T221765: this makes queries much more complicated. Please first fill all data in the new schema, then discontinue the old table. _______________________________________________ Wikidata-tech mailing list Wikidata-tech@lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/wikidata-tech