Well, HA typically has to do with availability not performance. However, if you add redundant equipment, e.g. another column, you can improve performance and improve availability. So, db scaling issues can be resolved by adding memory and CPUs. Applications can be scaled by adding by cloning vertically, add memory, cpus, etc. A redundant column of equipment, e.g. web servers, etc.
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Well, HA typically has to do with availability not performance. However, if you add redundant equipment, e.g. another column, you can improve performance and improve availability. So, db scaling issues can be resolved by adding memory and CPUs. Applications can be scaled by adding by cloning vertically, add memory, cpus, etc. A redundant column of equipment, e.g. web servers, etc.