What is a TempDB?

What is the purpose of tempdb?

The tempdb system database is a global resource that holds: Temporary user objects that are explicitly created. They include global or local temporary tables and indexes, temporary stored procedures, table variables, tables returned in table-valued functions, and cursors.

How does tempdb work in SQL Server?

TempDB is a workhorse of SQL Server performing a number of functions to support both system and internal operations. With this workload TempDB will process a large number of database writes, which requires low-latency, high throughput underlying storage.

What is resource DB in SQL Server?

The Resource database is a read-only database that contains all the system objects that are included with SQL Server. SQL Server system objects, such as sys. objects, are physically persisted in the Resource database, but they logically appear in the sys schema of every database.

What happens when tempdb is full?

The TempDB database is special in many ways, but an interesting aspect is that when its files automatically grow when they become full, this growth is not persisted and will be undone on the next restart of the SQL Server service.