BulkLoad with Composite Primary Key
Posted by: Joseph Lawler
Date: June 30, 2020 02:58PM

Is there some trick to bulkloading a table that has a composite primary key?

Scenario is this: Using Visual Studio C# I am able to do a bulk load when the primary key is set to a single Auto-increment column (ID). Works fine and useful for early testing. Table size in test exceeds 100M rows so bulk load is a requirement.

The actual Primary key is a composite of two columns that are both not null and the combination of which will always be unique (guaranteed due to the data creation algorithm).

Yet when I try to load the table with the composite primary key defined, bulk load only loads a single row with both elements of the primary key zeroed out. Huh.

I've verified:
- data going in - the values in the key columns are always completed.
- Table definition in MySQL. Keys are correctly listed as part of primary
- everything works fine if I use the Unique non-composite ID key.

I have no use for the Unique ID column so a primary key or index there seems completely unecessary.

Any ideas?

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BulkLoad with Composite Primary Key
June 30, 2020 02:58PM


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