# Stability and Performance at Hyper Scale
+ Dynamic `Region` (Range or Shard)
  + `PB-level` cluster
+ Resource management framework
  + One of the important fundations of multi-tenancy
+ Execution plan cache enhancement
  + Execution plan cache for both `prepared statement` and `non-prepared statement` 
+ Distributed execution for single `DDL` (like **`ADD INDEX`**)
+ `Amazon Elastic Block Storage` (`EBS`) and `GCP persistent disk` snapshot-based backup and restore
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