Automated Column Reordering for Alignment Trap Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Business Intelligence (BI) databases face significant challenges in efficiently scanning and filtering large amounts of data due to alignment traps caused by numeric column values not being on proper byte boundaries, leading to performance penalties and increased costs as the number of columns in filtering predicates grows.
Innovation Solution
The solution involves re-ordering columns in a logical create table statement to align them optimally for physical storage, using a deterministic method that positions byte-alignment-required fields first, followed by variable length fields, and adding padding to ensure proper byte alignment without requiring manual user intervention or additional disk space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If columns are stored in the order specified in the create table statement, then the table structure is simple and easy to implement, but alignment traps occur causing performance penalties
Solution Approach 1:
The system performs preliminary action by automatically re-ordering columns during table creation based on their data types and alignment requirements. Columns requiring byte alignment are positioned first, followed by variable length fields, ensuring proper alignment is established before data storage begins, thereby eliminating alignment traps during query execution without requiring manual user intervention
2Productivity
If manual column re-ordering is performed to align columns properly, then alignment traps are reduced, but user complexity and time consumption increase
Solution Approach 1:
The system implements self-service by automatically detecting column alignment requirements and re-ordering columns during table creation. The database system analyzes data types, identifies columns requiring byte alignment, and positions them appropriately without needing user input or manual configuration, thereby maintaining high query throughput while eliminating user complexity
3Manufacturing precision
If padding is added between columns to ensure alignment, then byte alignment is achieved, but additional disk space is required
Solution Approach 1:
The system applies local quality by adding padding only where necessary between specific column types to achieve proper byte alignment. Rather than uniformly padding all columns, the system selectively introduces padding between columns with different alignment requirements, thereby achieving precise byte alignment for numeric columns while minimizing unnecessary disk space consumption
Data Source
AI summary
An automated method to align column values to proper byte boundaries for rapid scanning in a parallel processing database system. A table definition is received having a logical order of fields. The fields are re-ordered to create a physical order of fields. The physical order of fields has fixed length fields having a same byte alignment requirement positioned adjacent to each other in descending order from largest size to smallest size, and wherein a first fixed length field in the physical order is aligned on a proper byte boundary. Other embodiments, aspects and features are also disclosed.