Steps:
#[x] Implement update script to add new column term_entity_prefixedfull_entity_id and associated indexes {T162533}
#[x] DBA to add new column term_entity_prefixed_idfull_entity_id (but possibly not yet the indexes) {T162539 }
[ ] Switch to updating both, the old and the new column {T167229}, {T165197}
# Switch to updat[ ] Populate new column using both, the old and the new columnmaintenance script: {T162533}
# Populate new column using maintenance script
# [ ] DBA to create new indexes using new column, if not already done when the column was created (needs lots of disk space)
#[ ] Switch to queries using the new column
*[x] join against page and redirect table instead of wb_entity_per_page {T162673}
*[ ] make sure we are not using old and new indexes at once now, since they need a lot of RAM
#[ ] Switch off writing to the old column (this breaks compat for scripts on ToolLabs)
#[ ] DBA to drop old column and indexes (free a lot of disk space)