dbs/db4/single_execution_threshold is a SAP Parameter attribute which is used to control Maximum number of SQL statements per single-execution package information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
SQL packages are restricted in size, depending on the database version.
You can use this parameter to define the maximum number of SQL
statements for each temporary SQL package. It can be useful to reduce
the default value if statements are exceptionally complex, meaning that
the estimated space required for each statement is not sufficient.
(Temporary SQL packages means packages in the library R3<(>
<<)>sid>Y0000, which include SQL statements with the database hint
See SAP Parameter Documentation for full SAP documentation for this profile parameter.