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Comments on How much memory is allocated for a MySQL VARCHAR variable in a stored procedure?

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How much memory is allocated for a MySQL VARCHAR variable in a stored procedure?

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In a stored procedure let's say I have a VARCHAR variable,

DECLARE example_variable VARCHAR(100);

how much memory is allocated to it and is that independent of the length of the data in the variable?

The reason I ask is that I had a stored procedure that would run out of memory until I trimmed the VARCHAR lengths down. The actual data inside the variable never changed only the declared size.

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General comments (4 comments)
General comments
Jirka Hanika‭ wrote almost 4 years ago

It's really puzzling that a low, fixed number of variables could ever exhaust your system memory. Was the stored procedure perhaps recursive? If you changed max_sp_recursion_depth, you might need to change thread_stack as well.

Alexei‭ wrote almost 4 years ago

Can you please post the relevant parts of your procedure? As written, this looks like an XY problem (i.e. the issue seems to be in the way the procedure is written not the VARCHAR length).

Alexei‭ wrote almost 4 years ago

Also, can you provide more information about "run out of memory"? Is it the stack (too much recursion?) or another type of memory?