See the Hardware section for additional recommendations based on your expected workloads.
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From the command line, you can pass a string to the client for execution, or you can pass a. The CockroachDB SQL client allows you to execute commands from the command line, or through the CockroachDB SQL shell interface. For a tutorial on performing schema changes with Flyway, see our Flyway tutorial. For a tutorial on performing database schema changes using Liquibase, see our Liquibase tutorial. As a best practice, we recommend creating database schemas and performing database schema changes with one of the following methods:ĬockroachDB is compatible with most PostgreSQL database schema migration tools, including Flyway and Liquibase.
#Dbschema how to make subcollection drivers#
We do not recommend using client drivers or ORM frameworks to execute database schema changes. Object owners have all privileges required to view, modify, or delete that object and the data stored within it.įor more information about ownership, privileges, and authorization, see Authorization. With roles, or with direct assignment, you can grant a SQL user the privileges required to view, modify, and delete database schema objects.īy default, the user that creates an object is that object's owner. Control access to objectsĬockroachDB supports both user-based and role-based access control. Temporary objectsĪ temporary object is an object, such as a table, view, or sequence, that is not stored to persistent memory.įor guidance on using temporary objects, see Temporary Tables. Sequences create and store sequential data.įor guidance on using sequences, see the CREATE SEQUENCE syntax page.
![dbschema how to make subcollection dbschema how to make subcollection](https://miro.medium.com/max/1838/1*SzsTAulGimTpWjpdLFQdXQ.png)
ViewsĪ view is a stored and named selection query.įor guidance on using views, see Views. For guidance on specialized indexes, see the following pages:ĬockroachDB supports several other objects at the third level of the naming hierarchy, including reusable views, sequences, and temporary objects. Specialized indexesĬockroachDB supports some specialized types of indexes, designed to improve query performance in specific use cases. For guidance on defining secondary indexes, see Add a Secondary Index. The two main types of indexes are the primary index, an index on the row-identifying primary key columns, and the secondary index, an index created on non-primary-key columns of your choice.įor guidance on defining primary keys, see Select Primary Key Columns.
![dbschema how to make subcollection dbschema how to make subcollection](https://i.stack.imgur.com/34mMQ.png)
CockroachDB queries use indexes to more efficiently find data in a table, given the values of a particular column. IndexesĪn index is a copy of the rows in a single table, sorted by a column or set of columns. Columns can be further qualified with column-level constraints, or computed with scalar expressions.įor guidance on defining tables, see Tables. Each column allows values of data of a single data type. Each value in a row of data belongs to a particular column. Each table can belong to a single user-defined schema. Tables, belong to the third and lowest level of the naming hierarchy. To avoid confusion with the general term " schema", in this guide we refer to the logical object as a user-defined schema, and to the relationship structure of logical objects in a cluster as a database schema.