2006936 - SAP uses different transaction isolation level from SQL Server

SQL Server has five types of transaction isolation levels: Read Uncommitted, Read Committed, Repeatable Read, Serializable and Snapshot. And the default transaction isolation level is Read Committed. For NETWEAVER based applications, SAP recommends customer keeping this default setting. Please don't change it.

However, some customer run the following command "DBCC useroptions" on T_code DBAcockpit =>Diagnostics =>SQL Command Editor from a SAP Netweaver system, and get the following result:

Set Option                                                                  Value

======================================================

textsize                                                                       2147483647

language                                                                     us_english

dateformat                                                                  mdy

datefirst                                                                        7

lock_timeout                                                                 -1

quoted_identifier                                                          SET

ansi_null_dflt_on                                                          SET

ansi_warnings                                                              SET

ansi_padding                                                               SET

ansi_nulls                                                                     SET

concat_null_yields_null                                                 SET

isolation level                                                         read uncommitted

The isolation level is different from SAP recommendation and also different from the execution result with the same command from SQL Server Management Studio:

Set option                                                                  Value

textsize                                                                        -1

language                                                                   us_english

dateformat                                                                    mdy

datefirst                                                                          7

lock_timeout                                                                  -1

quoted_identifier                                                            SET

ansi_null_dflt_on                                                            SET

ansi_warnings                                                                SET

ansi_padding                                                                  SET

ansi_nulls                                                                       SET

concat_null_yields_null                                                  SET

isolation level                                                             read committed

The result of isolation level is different for  these two checking means.

SQL Server 2005 and Higher

SQL Server based SAP ABAP system

SQL Server Isolation Level Read Committed Read Uncommitted DBCC Useroptions     , KBA , BC-DB-MSS , SQL Server in SAP NetWeaver Products , How To