mysql 禁用主键 启用主键 mysql禁用外键约束 本文翻译自:How to temporarily disable a foreign key constraint in MySQL? Is it possible to temporarily disable constraints in MySQL?是否可以在MySQL中暂时禁用约束? I have two Django models, each with a ForeignKey to the other one.我有两个Django模型,每个...
To disable foreign key constraints when you want to truncate a table: UseFOREIGN_KEY_CHECKS SET FOREIGN_KEY_CHECKS=0; and remember to enable it when you’re done: SET FOREIGN_KEY_CHECKS=1; Or you can useDISABLE KEYS: ALTER TABLE table_name DISABLE KEYS; Again, remember to enable if the...
本文翻译自:How to temporarily disable a foreign key constraint inMySQL?Is it possible to temporarily disable constraints inMySQL? 是否可以在MySQL中暂时禁用约束?I have two Django models, each with a ForeignKey to the mysql 禁用主键 启用主键 ...
Oracle provides granular control of database constraint enforcement. For example, you can disable constraints temporarily while making modifications to table data. Constraint states can be defined using theCREATE TABLEorALTER TABLEstatements. The following constraint states are su...
• 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: SETunique_checks=0; ... SQL import statements ...SETunique_checks=1; For big tables, this saves a lot of disk I/O because Inn...
Run ndb_restore --allow-pk-changes (possibly along with --ignore-extended-pk-updates, --disable-indexes, and possibly other options as needed) to restore all data Run ndb_restore --rebuild-indexes using the backup made with the desired schema, to rebuild indexes and constraints When extend...
If you disable binary logging, you must also specify --skip-log-slave-updates, as the --log-slave-updates option is enabled by default from MySQL 8.0.3 and requires binary logging. If you use mysqld to initialize the data directory manually by invoking it with the --initialize or --...
Use thedisable-keysoption in mysqldump when dumping data, to disable foreign key constraints before load. Disabling foreign key checks provides performance gains. Enable the constraints and verify the data after the load to ensure referential integrity. ...
()function. The feature is designed for a group of senders and a group of receivers to keep synchronized with each other even when some members are temporarily unavailable. It also synchronizes a group of receivers with one or more senders that are not part of a managed group. A replica ...
Disable foreign key constraints firing during the process with the disable-keys option. Defer index creation until after the restore is complete with the defer-table-indexes option.For more information on mysqldump, see mysqldump — A Database Backup Program.Note...