I did know all the important thinks it stands for but not the exact definition. But I think the he/she meant that people didn't understand ACID and not that they didn't know the exact definition.
EDIT:
I would never expect someone to know the exact definition of ACID or SOLID or similar. But if they have a lot of experience with db they should always know the ideas behind it and even if they are not an expert (but will have to write SQL) I would expect them to know what problems rough to look out for and when they should make sure they are currently not running into such an problem by e.g. checking the postgres documentation. It's good.
I did know all the important thinks it stands for but not the exact definition. But I think the he/she meant that people didn't understand ACID and not that they didn't know the exact definition.
EDIT:
I would never expect someone to know the exact definition of ACID or SOLID or similar. But if they have a lot of experience with db they should always know the ideas behind it and even if they are not an expert (but will have to write SQL) I would expect them to know what problems rough to look out for and when they should make sure they are currently not running into such an problem by e.g. checking the postgres documentation. It's good.