What is a primary filegroup?
A primary filegroup contains the primary datafile (mdf) and possibly secondary datafiles (ndf). All system tables are allocated to the primary filegroup. A secondary filegroup (also called a user-defined filegroup) contains secondary datafiles (ndf) and database objects.
What is primary data SQL?
The Primary Data File is the data file that is the initial data file holding data in SQL Server and points to other files within your database. Primary Data Files have a . mdf extension on them. Secondary Data Files are data files that hold all data that do not belong in the Primary Data File.
How do I fix primary filegroup is full error?
To solve Primary filegroup is full error go to the Database propriety -> Files -> Database Files -> Filegroup “PRIMARY” -> Autogrowth/Maxsize and Change Filegroup Database_Name In Megabytes to 1, Maximum File Size check Unlimited then Ok.
What is the purpose of primary data file?
The Primary data file contains startup information for the database and points to other files in the database. User data and objects can be stored in this file and every database has one primary data file.
What is NDF in SQL Server?
ndf extension is a secondary database file used by Microsoft SQL Server to store user data. NDF is secondary storage file because SQL server stores user specified data in primary storage file known as MDF. … It is usually stored on separate disk and can spread to multiple storage devices.
How do I free up space in SQL?
Freeing up space in local SQL Server Databases
- Shrink the DB. There is often unused space within the allocated DB files (*. mdf).
- Shrink the Log File. Same idea as above but with the log file (*. ldf).
- Rebuild the indexes and then shrink the DB. If you have large tables the indexes are probably fragmented.
What is the maximum number of files in one database?
Database Engine objects
|SQL Server Database Engine object||Maximum sizes/numbers SQL Server (64-bit)|
|Filegroups per database||32,767|
|Filegroups per database for memory-optimized data||1|
|Files per database||32,767|
|File size (data)||16 terabytes|
How do you create a user defined data type?
To create a user-defined data type. In Object Explorer, expand Databases, expand a database, expand Programmability, expand Types, right-click User-Defined Data Types, and then click New User-Defined Data Type.
What is the purpose of primary key?
A primary key is the column or columns that contain values that uniquely identify each row in a table. A primary key is needed: To extract or archive data from a table that is visited more than once during a process (for example, a child table that has two or more parent tables referenced in the Access Definition).
How does primary key work in SQL?
A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values. … If a table has a primary key defined on any field(s), then you cannot have two records having the same value of that field(s).
Is full due to Active_transaction?
Transaction Log is Full Due To ACTIVE_TRANSACTION. … When this error occurs, the Transaction Log file was FULL even though a Transaction log is backed up. ACTIVE_TRANSACTION means that there is an active transaction in the database. Because of this, SQL Server can not truncate the transaction log file.
What are the limitations of SQL Express?
Limitations of SQL Server Express:
- 1GB maximum memory used by the database engine.
- 10GB maximum database size.
- 1MB maximum buffer cache.
- CPU the lesser of one (1) socket or four (4) cores (number of SQL user connections NOT limited)