dbs/db4/timeout_retry is a SAP Parameter attribute which is used to control Number of attempts to access locked tables/records 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 .
Total number of attempts to repeat the execution of an SQL statement
when a table or record is locked (SQL0913). Note that this sets the
overall time a database request waits for a table (row) to become
available to a maximum of (<(><<)>n>+1) * WAITFILE seconds ((<(>
<<)>n>+1) * WAITRCD seconds), where WAITFILE and WAITRCD are table
attributes, which are visible using the DSPFD command.
If dbs/db4/alter_table_timeout_retry is set to -1, it will take the
value of dbs/db4/timeout_retry.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.