Anteckning
Åtkomst till den här sidan kräver auktorisering. Du kan prova att logga in eller ändra kataloger.
Åtkomst till den här sidan kräver auktorisering. Du kan prova att ändra kataloger.
Applies to: 
SQL Server 2016 (13.x) and later
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Contains a row for each external file format in the current database for SQL Server, SQL Database, and Azure Synapse Analytics.
Contains a row for each external file format on the server for Analytics Platform System (PDW).
| Column Name | Data Type | Description | Range |
|---|---|---|---|
| file_format_id | int | Object ID for the external file format. | |
| name | sysname | Name of the file format. in SQL Server and Azure Synapse Analytics, this is unique for the database. In Analytics Platform System (PDW), this is unique for the server. | |
| format_type | tinyint | The file format type. | DELIMITEDTEXT, RCFILE, ORC, PARQUET |
| field_terminator | nvarchar(10) | For format_type = DELIMITEDTEXT, this is the field terminator. | |
| string_delimiter | nvarchar(10) | For format_type = DELIMITEDTEXT, this is the string delimiter. | |
| date_format | nvarchar(50) | For format_type = DELIMITEDTEXT, this is the user-defined date and time format. | |
| use_type_default | bit | For format_type = DELIMITED TEXT, specifies how to handle missing values when PolyBase is importing data from HDFS text files into Azure Synapse Analytics. | 0 - store missing values as the string 'NULL'. 1 - store missing values as the column default value. |
| serde_method | nvarchar(255) | For format_type = RCFILE, this is the serialization/deserialization method. | |
| row_terminator | nvarchar(10) | For format_type = DELIMITEDTEXT, this is the character string that terminates each row in the external Hadoop file. | Always '\n'. |
| encoding | nvarchar(10) | For format_type = DELIMITEDTEXT, this is the encoding method for the external Hadoop file. | Always 'UTF8'. |
| data_compression | nvarchar(255) | The data compression method for the external data. | For format_type = DELIMITEDTEXT: - 'org.apache.hadoop.io.compress.DefaultCodec' - 'org.apache.hadoop.io.compress.GzipCodec' For format_type = RCFILE: - 'org.apache.hadoop.io.compress.DefaultCodec' For format_type = ORC: - 'org.apache.hadoop.io.compress.DefaultCodec' - 'org.apache.hadoop.io.compress.SnappyCodec' For format_type = PARQUET: - 'org.apache.hadoop.io.compress.GzipCodec' - 'org.apache.hadoop.io.compress.SnappyCodec' |
Permissions
The visibility of the metadata in catalog views is limited to securables that a user either owns or on which the user has been granted some permission. For more information, see Metadata Visibility Configuration.
See Also
sys.external_data_sources (Transact-SQL)
sys.external_tables (Transact-SQL)
CREATE EXTERNAL FILE FORMAT (Transact-SQL)