Optimization Dilemma: Multiple Single INSERTs or One Multiple-Row INSERT?
When aiming to optimize data insertion into MySQL, the question arises: should developers opt for chaining INSERTs to create a single, extensive multiple-row INSERT or execute multiple distinct INSERTs? This comparative analysis delves into the efficiency considerations pertinent to each approach.
According to MySQL documentation, the time taken to insert a row comprises the following components:
- Connecting: 3
- Sending query to server: 2
- Parsing query: 2
- Inserting row: 1 (multiplied by size of row)
- Inserting indexes: 1 (multiplied by number of indexes)
- Closing: 1
It becomes evident that transmitting a single, comprehensive statement can effectively reduce overhead by 7 per insert statement. This aligns with the recommendation provided in the MySQL documentation:
"If you are inserting many rows from the same client at the same time, use INSERT statements with multiple VALUES lists to insert several rows at a time. This is considerably faster (many times faster in some cases) than using separate single-row INSERT statements."
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