Effects on database performance when using long object names
Long object names are converted internally to system object names when used in SQL
statements. This conversion can have some performance impacts. 
Names of tables,
views, indexes, and aliases that are 30 characters or less will generally perform much better than
names longer than 30 characters.
Qualify the long object name with a library name and the conversion to the short name happens at
precompile time. In this case, there is minimal performance impact when the
statement is executed. Otherwise, the conversion is done at execution time and has a small
performance impact.