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https://dev.mysql.com/doc/refman/5.7/en/problems-with-float.html
Floating-point numbers sometimes cause confusion because they are approximate and not stored as exact values. A floating-point value as written in an SQL statement may not be the same as the value represented internally. Attempts to treat ...
https://dev.mysql.com/doc/refman/5.7/en/pam-pluggable-authentication.html
Proxy user support: PAM authentication can return to MySQL a user name different from the external user name passed by the client program, based on the PAM groups the external user is a member of and the authentication string provided. Optionally, ... Note PAM pluggable authentication is an extension included in MySQL Enterprise Edition, a commercial ...
https://dev.mysql.com/doc/refman/5.7/en/environment-variables.html
This section lists environment variables that are used directly or indirectly by MySQL. Most of these can also be found in other places in this manual. Options on the command line take precedence over values specified in option files and ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-thread-pool.html
The Thread Pool then manages client connections within configurable thread groups, where they are prioritized and queued based on the nature of the work they were submitted to accomplish. If you are using the innodb_thread_concurrency to limit the ...What is the Thread Pool and what problem does it solve? ...
https://dev.mysql.com/doc/refman/5.7/en/create-table-select.html
You can create one table from another by adding a SELECT statement at the end of the CREATE TABLE statement: CREATE TABLE new_tbl [AS] SELECT * FROM orig_tbl; MySQL creates new columns for all elements in the SELECT. For example: mysql> CREATE ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-autocommit-commit-rollback.html
Grouping DML Operations with Transactions By default, connection to the MySQL server begins with autocommit mode enabled, which automatically commits every SQL statement as you execute it. If autocommit mode is enabled, each SQL statement forms a ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-waits-current-table.html
For example, it can be used with GROUP BY OBJECT_INSTANCE_BEGIN to see whether the load on 1,000 mutexes (that protect, say, 1,000 pages or blocks of data) is spread evenly or just hitting a few bottlenecks. The table stores one row per thread ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-materialization.html
The optimizer uses materialization to enable more efficient subquery processing. Materialization speeds up query execution by generating a subquery result as a temporary table, normally in memory. The first time MySQL needs the subquery result, it ...
https://dev.mysql.com/doc/refman/5.7/en/sys-memory-global-by-current-bytes.html
These views summarize memory use, grouped by allocation type (that is, by event). By default, rows are sorted by descending amount of memory used. The memory_global_by_current_bytes and x$memory_global_by_current_bytes views have these columns: ...
https://dev.mysql.com/doc/refman/5.7/en/sys-wait-classes-global-by-avg-latency.html
These views summarize wait class average latencies, grouped by event class. An event class is determined by stripping from the event name everything after the first three components. The wait_classes_global_by_avg_latency and ...