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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-variable-summary-tables.html
The Performance Schema makes status variable information available in the tables described in Section 29.12.15, “Performance Schema Status Variable Tables”. It also makes aggregated status variable information available in summary tables, ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-status-variables.html
Performance Schema status variables have the following meanings: Performance_schema_accounts_lost The number of times a row could not be added to the accounts table because it was full. Performance_schema_digest_lost The number of digest instances ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-thread-filtering.html
The order in which matching occurs matters because different matching setup_actors rows can have different USER and HOST values. The threads table contains a row for each server thread. Each row contains information about a thread and indicates ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-tp-thread-group-state-table.html
These are the initial statements for transactions that have not started, so they also represent queued transactions. Note The Performance Schema table described here is available as of MySQL 8.0.14. Prior to MySQL 8.0.14, use the corresponding ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-transaction-summary-tables.html
The transaction summary tables have these indexes: events_transactions_summary_by_account_by_event_name: Primary key on (USER, HOST, EVENT_NAME) events_transactions_summary_by_host_by_event_name: Primary key on (HOST, EVENT_NAME) ... The Performance ...
https://dev.mysql.com/doc/refman/8.0/en/perl-support.html
DBI does not work if you have an older version of Perl. The Perl DBI module provides a generic interface for database access. You can write a DBI script that works with many different database engines without change. To use DBI, you must install ...
https://dev.mysql.com/doc/refman/8.0/en/pluggable-storage.html
MySQL Server uses a pluggable storage engine architecture that enables storage engines to be loaded into and unloaded from a running MySQL server. Plugging in a Storage Engine Before a storage engine can be used, the storage engine plugin shared ...
https://dev.mysql.com/doc/refman/8.0/en/plugin-services.html
MySQL server plugins have access to server “plugin services.” The plugin services interface complements the plugin API by exposing server functionality that plugins can call. For developer information about writing plugin services, see MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/populating-spatial-columns.html
After you have created spatial columns, you can populate them with spatial data. Values should be stored in internal geometry format, but you can convert them to that format from either Well-Known Text (WKT) or Well-Known Binary (WKB) format. For ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-decimal-characteristics.html
In MySQL, DECIMAL(M,D) and NUMERIC(M,D) are the same, and both have a precision of exactly M digits. This section discusses the characteristics of the DECIMAL data type (and its synonyms), with particular regard to the following topics: Maximum ...