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arXiv · 1909.03291

Compiling PL/SQL Away

Christian Duta·Denis Hirn·Torsten Grust
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Abstract

"PL/SQL functions are slow," is common developer wisdom that derives from the tension between set-oriented SQL evaluation and statement-by-statement PL/SQL interpretation. We pursue the radical approach of compiling PL/SQL away, turning interpreted functions into regular subqueries that can then be efficiently evaluated together with their embracing SQL query, avoiding any PL/SQL to SQL context switches. Input PL/SQL functions may exhibit arbitrary control flow. Iteration, in particular, is compiled into SQL-level recursion. RDBMSs across the board reward this compilation effort with significant run time savings that render established developer lore questionable.

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Christian Duta, Denis Hirn, Torsten Grust. 2019-09-07. Compiling PL/SQL Away. https://arxiv.org/abs/1909.03291

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