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https://dev.mysql.com/doc/refman/8.4/en/database-count-limit.html
The underlying file system may have a limit on the number of files that represent tables. The underlying file system may have a limit on the number of directories.
https://dev.mysql.com/doc/refman/8.4/en/group-replication-replication-group-member-stats.html
The performance_schema.replication_group_member_stats table provides group-level information related to the certification process, and also statistics for the transactions received and originated by each individual member of the replication group.
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-arbitrator-validity-detail.html
The arbitrator_validity_detail table shows the view that each data node in the cluster has of the arbitrator. All nodes should show the same arbitrator and arb_ticket values as well as the same arb_state value. Possible arb_state values are ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-arbitrator-validity-summary.html
The arbitrator_validity_summary table provides a composite view of the arbitrator with regard to the cluster's data nodes. If it has more than 1 row for longer than a few moments, then either not all nodes are connected to the arbitrator, or all ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-counters.html
The counters table provides running totals of events such as reads and writes for specific kernel blocks and data nodes. The counters table contains the following columns: node_id The data node ID block_name Name of the associated NDB kernel block ...Counts are kept from the most recent node start or restart; a node start or restart resets all counters on that ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-cpudata-1sec.html
The cpudata_1sec table provides data about CPU usage per second over the last 20 seconds.
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-cpudata-20sec.html
The cpudata_20sec table provides data about CPU usage per 20-second interval over the last 400 seconds.
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-cpudata-50ms.html
The cpudata_50ms table provides data about CPU usage per 50-millisecond interval over the last second.
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-cpudata.html
The cpudata table provides data about CPU usage during the last second.
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-cpuinfo.html
The cpuinfo table provides information about the CPU on which a given data node executes. The cpuinfo table contains the following columns: node_id Node ID cpu_no CPU ID cpu_online 1 if the CPU is online, otherwise 0 core_id CPU core ID socket_id ...