sql - What are the drawbacks of having million+ tables in same DB? -

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i have designed db create tables dynamically , load data it. (single user's data stored in single table)

so db having around million+ tables 2% having millions of rows in , 30% having million of records , 68% having 1000-10,000 rows in each (but in single db)...!!!

out of these around 10-20% of tables having same schema.

is safe db's memory? affect performance of queries?

or should have merge 10% of data single table? if merged save space?


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