System tables
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There are multiple types of system tables:
mysql
schema: There are mostly real tables stored on TiKV
: These tables are generated on request and not stored on disk.
performance_schema
: These tables are generated on request and not stored on disk.
metrics_schema
: These are metrics from Prometheus, not real tables.
SYS
: these are views etc to make performance_schema
easier to use.
See also the docs: