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https://dev.mysql.com/doc/refman/8.4/en/performance-schema-events-transactions-history-long-table.html
The events_transactions_history_long table contains the N most recent transaction events that have ended globally, across all threads. Transaction events are not added to the table until they have ended. When the table becomes full, the oldest row ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-events-transactions-history-table.html
The events_transactions_history table has the same columns and indexing as events_transactions_current. The events_transactions_history table contains the N most recent transaction events that have ended per thread. Transaction events are not added ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-events-waits-history-long-table.html
The events_waits_history_long table contains N the most recent wait events that have ended globally, across all threads. Wait events are not added to the table until they have ended. When the table becomes full, the oldest row is discarded when a ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-events-waits-history-table.html
The events_waits_history table has the same columns and indexing as events_waits_current. The events_waits_history table contains the N most recent wait events that have ended per thread. Wait events are not added to the table until they have ended. When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a new row for that thread is ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-examples.html
Tune a query by writing it differently, Tune the database schema (tables, indexes, and so forth). The Performance Schema is a tool to help a DBA do performance tuning by taking real measurements instead of “wild guesses.” This section ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-firewall-membership-table.html
The firewall_membership table provides a view into the in-memory data cache for MySQL Enterprise Firewall. It is used in conjunction with the mysql.firewall_membership system table that provides persistent storage of firewall data; see MySQL ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-hosts-table.html
The hosts table has these indexes: Primary key on (HOST) . The hosts table contains a row for each host from which clients have connected to the MySQL server. For each host name, the table counts the current and total number of connections. To set ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-keyring-component-status-table.html
The keyring_component_status table provides status information about the properties of the keyring component in use, if one is installed. The table is empty if no keyring component is installed (for example, if the keyring is not being used, or is ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-keyring-keys-table.html
MySQL Server supports a keyring that enables internal server components and plugins to securely store sensitive information for later retrieval. Key metadata includes key IDs, key owners, and backend key IDs. The keyring_keys table does not expose ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-log-status-table.html
The log_status table provides information that enables an online backup tool to copy the required log files without locking those resources for the duration of the copy process. When the log_status table is queried, the server blocks logging and ...