![]() Both PostgreSQL and MySQL support using extensions for their databases. ExtensionsĮxtensions support users to package functions, tables, data variables, and data structures into a single unit, which we can then plug to another database instance or remove as a whole. MySQL and PostgreSQL let users update the underlying data from the current view. Views allow users to abstract multiple tables as a single table so we can easily query the exact data we want from several tables. MySQL does not support inheritance for tables nor custom data types for them. ![]() Tables in PostgreSQL are inheritable and whenever we create a new table, an accompanying custom data type is created as well. In MySQL, schema and database are similar. ![]() In cases where there are more than 100 tables in the database, creating several different schemas for specific business requirements can keep us from getting overwhelmed by the sheer number of tables. A public schema will be automatically created when we create a new database in PostgreSQL. In PostgreSQL, each database can contain different schemas. MyISAM, Memory, CSV, Archive, and Blackhole are also supported. The default storage engine of MySQL is InnoDB. With MySQL, we can have multiple storage engines to choose from. PostgreSQL only supports a storage engine called zheap. MySQL only supports certain data types, namely numeric, date and time, string (character and byte), and spatial types, and JSON. PostgreSQL supports standard data types such as integers, text, booleans and customer-defined data types. With PostgreSQL, users have support for objects, classes, and inheritance, just like in object-oriented programming languages. PostgreSQL is an object-based relational database, while MySQL is a relational database. ![]() Support triggers for certain actions after a row is updated.Support sequences as list of integers that can be generated using specific commands.Support creating custom functions (alongside built-in ones) to perform calculations and data manipulation on multiple tables.Support using extensions for their databases.Let users update the underlying data from the current view.InnoDB, MyISAM, Memory, CSV, Archive, and Blackhole Only supports certain data types, namely numeric, date and time, string (character and byte), spatial types, and JSON Integers, text, booleans, and customer-defined data types The difference is that through its mechanism, sharding can take place in multiple database instances even in multiple computers in different regions. ShardĪ shard is similar to a partition, as it’s also a cloned part of a large table. Partitioning is supposed to occur only in a single database instance. PartitionĪ partition in the database is one part of a large table that has been cloned to boost performance during data queries from the database. The primary and secondary database will be synchronized regularly using cron jobs, or automatically after every update in the database to ensure the secondary database is up to date with the data state in the primary database. Replication is the ability to copy data from a primary database to a secondary database so that the latter can serve as the former’s backup, when needed. This includes values stored in the database, the tables existing in it, and the relationships between tables. InstanceĪn instance refers to the current state of the database at a particular time. With a DBMS, users can also change data structure or create functions for easier data manipulation. Fundamentals of database management systemsĪ database management system (DBMS) is a set of software that allows users to manipulate or retrieve data stored in a database.
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