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https://dev.mysql.com/doc/refman/8.0/en/mysqlimport.html
--replace, -r Command-Line Format --replace The --replace and --ignore options control handling of input rows that duplicate existing rows on unique key values. If you specify --replace, new rows replace existing rows that have the same unique key ... The mysqlimport client provides a command-line interface to the LOAD DATA SQL ...
https://dev.mysql.com/doc/refman/8.0/en/optimizing-innodb-bulk-data-loading.html
If you have UNIQUE constraints on secondary keys, you can speed up table imports by temporarily turning off the uniqueness checks during the import session: SET unique_checks=0; ... SET unique_checks=1; For big tables, this saves a lot of disk I/O ... These performance tips supplement the general guidelines for fast inserts in Section 10.2.5.1, “Optimizing INSERT ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-key.html
Partitioning by key is similar to partitioning by hash, except that where hash partitioning employs a user-defined expression, the hashing function for key partitioning is supplied by the MySQL server. NDB Cluster uses MD5() for this purpose; for ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-overview.html
All columns used in the table's partitioning expression must be part of every unique key that the table may have, including any primary key. Possible workarounds in this situation include adding the name column to the table's primary key, adding the ... This section provides a conceptual overview of partitioning in MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/structured-system-variables.html
Structured variable instances and components follow these naming rules: For a given type of structured variable, each instance must have a name that is unique within variables of that type. However, instance names need not be unique across ... A ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-logging-configuration.html
Consider the following set of archived encrypted log file names: audit.20190410T205827.log.20190403T185337-1.enc audit.20190410T210243.log.20190403T185337-1.enc audit.20190415T145309.log.20190414T223342-1.enc ... This section describes how to ...
https://dev.mysql.com/doc/refman/8.0/en/create-spatial-reference-system.html
SRID values must be unique, so if neither OR REPLACE nor IF NOT EXISTS is specified, an error occurs if an SRS definition with the given srid value already exists. The combination of the ORGANIZATION org_name and org_id attribute values must be ...
https://dev.mysql.com/doc/refman/8.0/en/general-tablespaces.html
If the ADD DATAFILE clause is not specified when creating a tablespace, a tablespace data file with a unique file name is created implicitly. The unique file name is a 128 bit UUID formatted into five groups of hexadecimal numbers separated by ... A ...
https://dev.mysql.com/doc/refman/8.0/en/group-by-handling.html
The query is invalid if name is not a primary key of t or a unique NOT NULL column. SQL-92 and earlier does not permit queries for which the select list, HAVING condition, or ORDER BY list refer to nonaggregated columns that are not named in the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-referential-constraints-table.html
UNIQUE_CONSTRAINT_CATALOG The name of the catalog containing the unique constraint that the constraint references. UNIQUE_CONSTRAINT_SCHEMA The name of the schema containing the unique constraint that the constraint references. The ...