tidb

查看表大小

SELECT TABLE_NAME,TABLE_ROWS FROM information_schema.TABLES
    where TABLE_SCHEMA  = 'rt'
    order by TABLE_ROWS desc

限制tidb内存使用

show config where name like '%cache%' and name like '%block%' and name like '%capacity%'
set config tikv `storage.block-cache.capacity`='10240MiB'