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. 
Converting Data Types
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. 
Mapping Integration Services Data Types to Database Data Types
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.
External Resources
Blog entry, Performance Comparison between Data Type Conversion Techniques in SSIS 2008, on blogs.msdn.com.
