tablespaces, and log file groups with the MySQL data dictionary. This is done using a thread, theNDBmetadata change monitor thread, which runs in the background and checks periodically for inconsistencies between theNDBdictionary and
MySQL is one of the most widely used open-source Database Management Systems in the world. MySQL is a Relational Database Management System and it runs on a Client-Server model. You can use theMySQL ODBC Connectorto connect a whole variety of different products and third-party applications su...
MySQL 8.0 delivers NOWAIT and SKIP LOCKED alternatives in the SQL locking clause. Normally, when a row is locked due to an UPDATE or a SELECT ... FOR UPDATE, any other transaction will have to wait to access that locked row. In some use cases there is a need to either return immediat...
Pushing down larger parts of a condition allows more rows to be filtered out by the data nodes, thereby reducing the number of rows which mysqld must handle during join processing. Another benefit of these enhancements is that filtering can be performed in parallel in the LDM threads, rather ...
MySQL 8.0 deliversNOWAITandSKIP LOCKEDalternatives in the SQL locking clause. Normally, when a row is locked due to anUPDATEor aSELECT ... FOR UPDATE, any other transaction will have to wait to access that locked row. In some use cases there is a need to either return immediately if a...
For example, encryption could be a sufficient measure to protect privacy, but may not be sufficient as a data security measure. Attackers could still cause damage by erasing the data or double-encrypting it to prevent access by authorized parties. Learn more in our detailed guide to data ...
1. Data Storage Optimization Different data types require different amounts of storage space. Selecting the right data type is essential to optimize storage. While over-sized data types may consume unnecessary disk space, under-sized ones may result in data truncation. By optimizing the data types...
a single quote is used in programming languages as a delimiter for character and string literals. in many programming languages, including c, c++, java, and python, single quotes are used to denote a single character, whereas double quotes are used to denote a string of characters. for ...
ApsaraDB RDS for MySQL is a tried and tested solution that handled large volumes of concurrent traffic during Double 11. ApsaraDB RDS for MySQL provides basic features such as whitelist configuration, backup and restoration, Transparent Data Encryption (TDE), data migration, and management of ...
perhaps only executing a single query. This means that the time spent processing connects and disconnects can have a large impact on the overall performance. In 5.7 we have offloaded thread initialization and network initialization to a worker thread (WL#6606) and more than doubled MySQL’s ab...