How to resolve slow insert performance on a large Oracle table?
Slow insertion speed may be caused by various factors, and here are some possible solutions:
- Ensure that the indexes and constraints on the table are reasonable, as having too many indexes or constraints may impact the insertion speed. Consider removing any unnecessary indexes or constraints.
- Consider using batch insertion of data, for example, inserting multiple records at once using the INSERT INTO … SELECT … statement instead of inserting one at a time.
- Adjust database parameters, such as increasing the sizes of PGA and SGA, or adjusting the size of the UNDO tablespace.
- Parallel insertion can be achieved by adding the PARALLEL keyword in the INSERT statement.
- Using partition tables to increase insertion speed can store data based on its characteristics, reducing data conflicts and improving insertion speed.
- Optimize the way data is inserted, such as avoiding extensive data conversion operations during insertion, by ensuring data cleaning and transformation is done at the application layer or during the ETL process.
By implementing the aforementioned methods for comprehensive optimization, it is possible to improve the speed of large table insertions. If issues persist, it is recommended to conduct performance tuning analysis to identify the root cause and take appropriate measures.
