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https://www.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.apdv.porting.doc/doc/r0052880.html
The following support is enabled for a DB2® database that has the varchar2_compat database configuration parameter set to ON. When the VARCHAR2 data type is explicitly encountered in SQL statements, it is implicitly mapped to the VARCHAR data type.
https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.apdv.porting.doc/doc/r0052880.html
When you create a database with VARCHAR2 support enabled, the varchar2_compat database configuration parameter is set to ON. If you create a database with VARCHAR2 support enabled, you cannot disable VARCHAR2 support for that database, even if you reset the DB2_COMPATIBILITY_VECTOR registry variable. Similarly, if you create a database with VARCHAR2 support disabled, you cannot enable VARCHAR2 ...
https://www.ibm.com/support/knowledgecenter/en/SSEPGG_9.7.0/com.ibm.db2.luw.admin.config.doc/doc/r0054914.html
DB2 Version 9.7 for Linux, UNIX, and Windows varchar2_compat - varchar2 compatibility database configuration parameter This parameter indicates whether the compatibility semantics associated with the VARCHAR2 and NVARCHAR2 data types are applied to the connected database.
https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.1.0/com.ibm.db2.luw.apdv.porting.doc/doc/r0052867.html
The Db2 product provides optional features that simplify the task of migrating applications from other relational database products such as Oracle, Sybase, and MySQL. These features are inactive by default, but the DB2_COMPATIBILITY_VECTOR registry variable can be used to activate any subset of them.
https://www.ibm.com/support/knowledgecenter/SSEPGG_9.7.0/com.ibm.db2.luw.apdv.porting.doc/doc/r0052867.html
Example 2 This example shows how to disable all compatibility features by resetting the DB2_COMPATIBILITY_VECTOR registry variable: db2set DB2_COMPATIBILITY_VECTOR= db2stop db2start Note that if a database has been created with the NUMBER data type or the VARCHAR2 data type enabled, use of the DATE data type as TIMESTAMP(0) enabled, or the creation of Oracle data …
https://stackoverflow.com/questions/48174846/oracle-to-db2-how-to-do-it
If your installation rejects this Oracle syntax then you must have made some mistake with your Db2 configuration. A common mistake is that the DB2_COMPATIBILITY_VECTOR=ORA variable was not effective before creating the Db2 database. Db2 does not currently support everything in Oracle's syntax, but this form of a cursor seems to be emulated ...
https://docs.oracle.com/cd/A57673_01/DOC/server/doc/SCN73/ch6.htm
Table 6 - 4. SQL/DS, DB2 Datatype Conversions to Oracle Datatypes The IBM products SQL/DS and DB2 datatypes TIME, TIMESTAMP, GRAPHIC, VARGRAPHIC, and LONG VARGRAPHIC have no corresponding Oracle datatype, and cannot be used. The TIME and TIMESTAMP datatypes are subcomponents of the Oracle datatype DATE.
https://www.databasestar.com/char-varchar-varchar2/
Feb 06, 2017 · CHAR does not need a size specified and has a default of 1. A size needs to be specified with VARCHAR/VARCHAR2 columns. CHAR will pad spaces to the right of strings to match the length of the column, while VARCHAR/VARCHAR2 does not. The performance of CHAR, VARCHAR, and VARCHAR2 is the same. There is no difference in performance with these data ...
https://dba.stackexchange.com/questions/1301/what-is-the-difference-between-oracles-varchar-and-varchar2-datatypes/1303
It would seem that Oracle at one time had plans to give a different definition to VARCHAR than to VARCHAR2.It has told customers this and recommends against using VARCHAR.Whatever their plans were, as of 11.2.0.2 VARCHAR is identical to VARCHAR2.Here is what the SQL Language Reference 11g Release 2 says:. Do not use the VARCHAR data type.
https://docs.oracle.com/cd/E35137_01/doc.32/e18460/oracle_db2_compared.htm
2 Oracle and DB2 Compared. ... VARCHAR2. CHAR VARYING (length) ... 2.3.7 IBM DB2 Datalinks. SQL Developer does not support the migration of IBM DB2 datalinks. Where it is necessary to migrate IBM DB2 datalinks, Oracle recommends creating an Oracle binary file (BFILE).
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