Integration Services Data Types
When data enters a data flow in a package, the source that extracts the data converts the data to an Integration Services data type. Numeric data is assigned a numeric data type, string data is assigned a character data type, and dates are assigned a date data type. Other data, such as GUIDs and Binary Large Object Blocks (BLOBs), are also assigned appropriate Integration Services data types. If data has a data type that is not convertible to an Integration Services data type, an error occurs.
Some data flow components convert data types between the Integration Services data types and the managed data types of the Microsoft .NET Framework. For more information about the mapping between Integration Services and managed data types, see Working with Data Types in the Data Flow.
The following table lists the Integration Services data types. Some of the data types in the table have precision and scale information that applies to them. For more information about precision and scale, see Precision, Scale, and Length (TransactSQL).
Data type  Description 

DT_BOOL  A Boolean value. 
DT_BYTES  A binary data value. The length is variable and the maximum length is 8000 bytes. 
DT_CY  A currency value. This data type is an eightbyte signed integer with a scale of 4 and a maximum precision of 19 digits. 
DT_DATE  A date structure that consists of year, month, day, hour, minute, seconds, and fractional seconds. The fractional seconds have a fixed scale of 7 digits. The DT_DATE data type is implemented using an 8byte floatingpoint number. Days are represented by whole number increments, starting with 30 December 1899, and midnight as time zero. Hour values are expressed as the absolute value of the fractional part of the number. However, a floating point value cannot represent all real values; therefore, there are limits on the range of dates that can be presented in DT_DATE. On the other hand, DT_DBTIMESTAMP is represented by a structure that internally has individual fields for year, month, day, hours, minutes, seconds, and milliseconds. This data type has larger limits on ranges of the dates it can present. 
DT_DBDATE  A date structure that consists of year, month, and day. 
DT_DBTIME  A time structure that consists of hour, minute, and second. 
DT_DBTIME2  A time structure that consists of hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits. 
DT_DBTIMESTAMP  A timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a fixed scale of 3 digits. 
DT_DBTIMESTAMP2  A timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits. 
DT_DBTIMESTAMPOFFSET  A timestamp structure that consists of year, month, day, hour, minute, second, and fractional seconds. The fractional seconds have a maximum scale of 7 digits. Unlike the DT_DBTIMESTAMP and DT_DBTIMESTAMP2 data types, the DT_DBTIMESTAMPOFFSET data type has a time zone offset. This offset specifies the number of hours and minutes that the time is offset from the Coordinated Universal Time (UTC). The time zone offset is used by the system to obtain the local time. The time zone offset must include a sign, plus or minus, to indicate whether the offset is added or subtracted from the UTC. The valid number of hours offset is between 14 and +14. The sign for the minute offset depends on the sign for the hour offset:

DT_DECIMAL  An exact numeric value with a fixed precision and a fixed scale. This data type is a 12byte unsigned integer with a separate sign, a scale of 0 to 28, and a maximum precision of 29. 
DT_FILETIME  A 64bit value that represents the number of 100nanosecond intervals since January 1, 1601. The fractional seconds have a maximum scale of 3 digits. 
DT_GUID  A globally unique identifier (GUID). 
DT_I1  A onebyte, signed integer. 
DT_I2  A twobyte, signed integer. 
DT_I4  A fourbyte, signed integer. 
DT_I8  An eightbyte, signed integer. 
DT_NUMERIC  An exact numeric value with a fixed precision and scale. This data type is a 16byte unsigned integer with a separate sign, a scale of 0  38, and a maximum precision of 38. 
DT_R4  A singleprecision floatingpoint value. 
DT_R8  A doubleprecision floatingpoint value. 
DT_STR  A nullterminated ANSI/MBCS character string with a maximum length of 8000 characters. (If a column value contains additional null terminators, the string will be truncated at the occurrence of the first null.) 
DT_UI1  A onebyte, unsigned integer. 
DT_UI2  A twobyte, unsigned integer. 
DT_UI4  A fourbyte, unsigned integer. 
DT_UI8  An eightbyte, unsigned integer. 
DT_WSTR  A nullterminated Unicode character string with a maximum length of 4000 characters. (If a column value contains additional null terminators, the string will be truncated at the occurrence of the first null.) 
DT_IMAGE  A binary value with a maximum size of 2311 (2,147,483,647) bytes. . 
DT_NTEXT  A Unicode character string with a maximum length of 230  1 (1,073,741,823) characters. 
DT_TEXT  An ANSI/MBCS character string with a maximum length of 2311 (2,147,483,647) characters. 
If the data in a column does not require the full width allocated by the source data type, you might want to change the data type of the column. Making each data row as narrow as possible helps optimize performance when transferring data because the narrower each row is, the faster the data is moved from source to destination.
Integration Services includes a complete set of numeric data types, so that you can match the data type closely to the size of the data. For example, if the values in a column with a DT_UI8 data type are always integers between 0 and 3000, you can change the data type to DT_UI2. Similarly, if a column with the DT_CY data type can meet the package data requirements by using an integer data type instead, you can change the data type to DT_I4.
You can change the data type of a column in the following ways:
Use an expression to implicitly convert data types. For more information, see Implicit Data Type Conversion in Expressions, Integration Services Data Types in Expressions, and Using Expressions in Packages.
Use the cast operator to convert data types. For more information, see Cast (SSIS Expression): Convert SSIS Data Types.
Use the Data Conversion transformation to cast the data type of a column from one data type to a different data type. For more information, see Data Conversion Transformation.
Use the Derived Column transformation to create a copy of a column that has a different data type than the original column. For more information, see Derived Column Transformation.
Converting Between Strings and Date/Time Data Types
The following table lists the results of casting or converting between date/time data types and strings:
When you use the cast operator or the Data Conversion transformation, the date or time type data type will be converted to the corresponding string format. For example, the DT_DBTIME data type will be converted to a string that has the format, "hh:mm:ss".
When you want to convert from a string to a date or time data type, the string must use the string format that corresponds to the appropriate date or time data type. For example, to successfully convert some date strings to the DT_DBDATE data type, these date strings must be in the format, "yyyymmdd".
Data type
String format
DT_DBDATE
yyyymmdd
DT_FILETIME
yyyymmdd hh:mm:ss:fff
DT_DBTIME
hh:mm:ss
DT_DBTIME2
hh:mm:ss[.fffffff]
DT_DBTIMESTAMP
yyyymmdd hh:mm:ss[.fff]
DT_DBTIMESTAMP2
yyyymmdd hh:mm:ss[.fffffff]
DT_DBTIMESTAMPOFFSET
yyyymmdd hh:mm:ss[.fffffff] [{+} hh:mm]
In the format for DT_FILETIME and DT_DBTIMESTAMP fff is a value between 0 and 999 that represents fractional seconds.
In the date format for DT_DBTIMESTAMP2, DT_DBTIME2, and DT_DBTIMESTAMPOFFSET, fffffff is a value between 0 and 9999999 that represents fractional seconds.
The date format for DT_DBTIMESTAMPOFFSET also includes a time zone element. There is a space between the time element and the time zone element.
Converting Date/Time Data Types
You can change the data type on a column with date/time data to extract the date or the time part of the data. The following tables list the results of changing from one date/time data type to another date/time data type.
Converting from DT_FILETIME
Convert DT_FILETIME to  Result 

DT_FILETIME  No change. 
DT_DATE  Converts the data type. 
DT_DBDATE  Removes the time value. 
DT_DBTIME  Removes the date value. Removes the fractional second value when its scale is greater than the number of fractional digits that the DT_DBTIME data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIME2  Removes the date value represented by the DT_FILETIME data type. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIME2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMP  Converts the data type. 
DT_DBTIMESTAMP2  Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMP2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMPOFFSET  Sets the time zone field in the DT_DBTIMESTAMPOFFSET data type to zero. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMPOFFSET data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
Converting from DT_DATE
Convert DT_DATE to  Result 

DT_FILETIME  Converts the data type. 
DT_DATE  No change. 
DT_DBDATE  Removes the time value represented by the DT_DATA data type. 
DT_DBTIME  Removes the date value represented by the DT_DATE data type. 
DT_DBTIME2  Removes the date value represented by the DT_DATE data type. 
DT_DBTIMESTAMP  Converts the data type. 
DT_DBTIMESTAMP2  Converts the data type. 
DT_DBTIMESTAMPOFFSET  Sets the time zone field in the DT_DBTIMESTAMPOFFSET data type to zero. 
Converting from DT_DBDATE
Convert DT_DBDATE to  Result 

DT_FILETIME  Sets the time fields in the DT_FILETIME data type to zero. 
DT_DATE  Sets the time fields in the DT_DATE data type to zero. 
DT_DBDATE  No change. 
DT_DBTIME  Sets the time fields in the DT_DBTIME data type to zero. 
DT_DBTIME2  Sets the time fields in the DT_DBTIME2 data type to zero. 
DT_DBTIMESTAMP  Sets the time fields in the DT_DBTIMESTAMP data type to zero. 
DT_DBTIMESTAMP2  Sets the time fields in the DT_DBTIMESTAMP data type to zero. 
DT_DBTIMESTAMPOFFSET  Sets the time fields and the time zone field in the DT_DBTIMESTAMPOFFSET data type to zero. 
Converting from DT_DBTIME
Convert DT_DBTIME to  Result 

DT_FILETIME  Sets the date field in the DT_FILETIME data type to the current date. 
DT_DATE  Sets the date field in the DT_DATE data type to the current date. 
DT_DBDATE  Sets the date field in the DT_DBDATE data type to the current date. 
DT_DBTIME  No change. 
DT_DBTIME2  Converts the data type. 
DT_DBTIMESTAMP  Sets the date field in the DT_DBTIMESTAMP data type to the current date. 
DT_DBTIMESTAMP2  Sets the date field in the DT_DBTIMESTAMP2 data type to the current date. 
DT_DBTIMESTAMPOFFSET  Sets the date field and the time zone field in the DT_DBTIMESTAMPOFFSET data type to the current date and to zero, respectively. 
Converting from DT_DBTIME2
Convert DT_DBTIME2 to  Result 

DT_FILETIME  Sets the date field in the DT_FILETIME data type to the current date. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_FILETIME data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DATE  Sets the date field of the DT_DATE data type to the current date. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DATE data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBDATE  Sets the date field of the DT_DBDATE data type to the current date. 
DT_DBTIME  Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIME data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIME2  Removes the fractional second value when its scale is greater than the number of fractional second digits that the destination DT_DBTIME2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMP  Set the date field in the DT_DBTIMESTAMP data type to the current date. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMP data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMP2  Sets the date field in the DT_DBTIMESTAMP2 data type to the current date. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMP2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMPOFFSET  Sets the date field and the time zone field in the DT_DBTIMESTAMPOFFSET data type to the current date and to zero, respectively. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMPOFFSET data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
Converting from DT_DBTIMESTAMP
Convert DT_DBTIMESTAMP to  Result 

DT_FILETIME  Converts the data type. 
DT_DATE  If a value represented by the DT_DBTIMESTAMP data type overflows the range of the DT_DATE data type, returns the DB_E_DATAOVERFLOW error. For more information, see Handling Errors in the Data Flow. 
DT_DBDATE  Removes the time value represented by the DT_DBTIMESTAMP data type. 
DT_DBTIME  Removes the date value represented by the DT_DBTIMESTAMP data type. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIME data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIME2  Removes the date value represented by the DT_DBTIMESTAMP data type. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIME2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMP  No change. 
DT_DBTIMESTAMP2  Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMP2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMPOFFSET  Sets the time zone field in the DT_DBTIMESTAMPOFFSET data type to zero. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMPOFFSET data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
Converting from DT_DBTIMESTAMP2
Convert DT_DBTIMESTAMP2 to  Result 

DT_FILETIME  Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_FILETIME data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DATE  If a value represented by the DT_DBTIMESTAMP2 data type overflows the range of the DT_DATE data type, the DB_E_DATAOVERFLOW error is returned. For more information, see Handling Errors in the Data Flow. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DATE data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBDATE  Removes the time value represented by the DT_DBTIMESTAMP2 data type. 
DT_DBTIME  Removes the date value represented by the DT_DBTIMESTAMP2 data type. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIME data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIME2  Removes the date value represented by the DT_DBTIMESTAMP2 data type. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIME2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMP  If a value represented by the DT_DBTIMESTAMP2 data type overflows the range of the DT_DBTIMESTAMP data type, returns the DB_E_DATAOVERFLOW error. DT_DBTIMESTAMP2 maps to a SQL Server data type, datetime2, with a range of January 1, 1A.D. through December 31, 9999. DT_DBTIMESTAMP maps to a SQL Server data type, datetime, with smaller a range of January 1, 1753 through December 31, 9999. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMP data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information about errors, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMP2  Removes the fractional second value when its scale is greater than the number of fractional second digits that the destination DT_DBTIMESTAMP2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMPOFFSET  Sets the time zone field in the DT_DBTIMESTAMPOFFSET data type to zero. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMPOFFSET data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
Converting from DT_DBTIMESTAMPOFFSET
Convert DT_DBTIMESTAMPOFFSET to  Result 

DT_FILETIME  Changes the time value represented by the DT_DBTIMESTAMPOFFSET data type to Coordinated Universal Time (UTC). Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_FILETIME data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DATE  Changes the time value represented by the DT_DBTIMESTAMPOFFSET data type to UTC. If a value represented by the DT_DBTIMESTAMPOFFSET data type overflows the range of the DT_DATE data type, returns the DB_E_DATAOVERFLOW error. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DATE data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBDATE  Changes the time value represented by the DT_DBTIMESTAMPOFFSET data type to UTC, which can affect the date value. The time value is then removed. 
DT_DBTIME  Changes the time value represented by the DT_DBTIMESTAMPOFFSET data type to UTC. Removes the data value represented by the DT_DBTIMESTAMPEOFFSET data type. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIME data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIME2  Changes the time value represented by the DT_DBTIMESTAMPOFFSET data type to UTC. Removes the date value represented by the DT_DBTIMESTAMPOFFSET data type. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIME2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMP  Changes the time value represented by the DT_DBTIMESTAMPOFFSET data type to UTC. If a value represented by the DT_DBTIMESTAMPOFFSET data type overflows the range of the DT_DBTIMESTAMP data type, the DB_E_DATAOVERFLOW error is returned. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMP data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMP2  Changes the time value represented by the DT_DBTIMESTAMPOFFSET data type to UTC. Removes the fractional second value when its scale is greater than the number of fractional second digits that the DT_DBTIMESTAMP2 data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
DT_DBTIMESTAMPOFFSET  Removes the fractional second value when its scale is greater than the number of fractional second digits that the destination DT_DBTIMESTAMPOFFSET data type can contain. After removing the fractional second value, generates a report about this data truncation. For more information, see Handling Errors in the Data Flow. 
The following table provides guidance on mapping the data types used by certain databases to Integration Services data types. These mappings are summarized from the mapping files used by the SQL Server Import and Export Wizard when it imports data from these sources. For more information about these mapping files, see Using the SQL Server Import and Export Wizard to Move Data.
Important 

These mappings are not intended to represent strict equivalency, but only to provide guidance. In certain situations, you may need to use a different data type than the one shown in this table. 
Note 

You can use the SQL Server data types to estimate the size of corresponding Integration Services date and time data types. 
Data Type  SQL Server (SQLOLEDB; SQLNCLI10)  SQL Server (SqlClient)  Jet  Oracle (OracleClient)  DB2 (DB2OLEDB)  DB2 (IBMDADB2) 

DT_BOOL  bit  bit  Bit  
DT_BYTES  binary, varbinary, timestamp  binary, varbinary, timestamp  BigBinary, VarBinary  RAW  
DT_CY  smallmoney, money  smallmoney, money  Currency  
DT_DATE  
DT_DBDATE  date  date  date  
DT_DBTIME  timestamp  time  time  
DT_DBTIME2  
DT_DBTIMESTAMP  DateTime  TIMESTAMP, DATE, INTERVAL  TIME, TIMESTAMP, DATE  TIME, TIMESTAMP, DATE  
DT_DBTIMESTAMP2  timestamp  timestamp  timestamp  
DT_DBTIMESTAMPOFFSET  timestampoffset  timestamp, varchar  timestamp, varchar  
DT_DECIMAL  
DT_FILETIME  
DT_GUID  uniqueidentifier  uniqueidentifier  GUID  
DT_I1  
DT_I2  smallint  smallint  Short  SMALLINT  SMALLINT  
DT_I4  int  int  Long  INTEGER  INTEGER  
DT_I8  bigint  bigint  BIGINT  BIGINT  
DT_NUMERIC  decimal, numeric  decimal, numeric  Decimal  NUMBER, INT  DECIMAL, NUMERIC  DECIMAL, NUMERIC 
DT_R4  real  real  Single  REAL  REAL  
DT_R8  float  float  Double  FLOAT, REAL  FLOAT, DOUBLE  FLOAT, DOUBLE 
DT_STR  char, varchar  VarChar  CHAR, VARCHAR  CHAR, VARCHAR  
DT_UI1  tinyint  tinyint  Byte  
DT_UI2  
DT_UI4  
DT_UI8  
DT_WSTR  nchar, nvarchar, sql_variant, xml  char, varchar, nchar, nvarchar, sql_variant, xml  LongText  CHAR, ROWID, VARCHAR2, NVARCHAR2, NCHAR  GRAPHIC, VARGRAPHIC  GRAPHIC, VARGRAPHIC 
DT_IMAGE  image  image  LongBinary  LONG RAW, BLOB, LOBLOCATOR, BFILE, VARGRAPHIC, LONG VARGRAPHIC, userdefined  CHAR () FOR BIT DATA, VARCHAR () FOR BIT DATA  CHAR () FOR BIT DATA, VARCHAR () FOR BIT DATA, BLOB 
DT_NTEXT  ntext  text, ntext  LONG, CLOB, NCLOB, NVARCHAR, TEXT  LONG VARCHAR, NCHAR, NVARCHAR, TEXT  LONG VARCHAR, DBCLOB, NCHAR, NVARCHAR, TEXT  
DT_TEXT  text  LONG VARCHAR FOR BIT DATA  LONG VARCHAR FOR BIT DATA, CLOB 
For information on mapping data types in the data flow, see Working with Data Types in the Data Flow.
Blog entry, Performance Comparison between Data Type Conversion Techniques in SSIS 2008, on blogs.msdn.com.