Implements RFC #59422. Adds four read-only diagnostic commands to
the occ CLI for administrators to inspect database health without
needing external tools:
- db:info: shows engine version and key config variables with
health check against recommended values
- db:size: lists all tables ordered by total disk usage
- db:index-usage: reports unused indexes via performance_schema
(MySQL) or pg_stat_user_indexes (PostgreSQL)
- db:locks: detects active blocking transactions and deadlocks
All commands support MySQL/MariaDB and PostgreSQL. A --json flag
is available for automated parsing. Includes 31 unit tests.
Closes#59422
Signed-off-by: Rodrigo Correia <rodrigo.mendes.correia@tecnico.ulisboa.pt>
Signed-off-by: Carolina Quinteiro <carolinafquinteiro@tecnico.ulisboa.pt>
Co-authored-by: Carolina Quinteiro <carolinafquinteiro@tecnico.ulisboa.pt>
