use cache for sql_db_list_tables in SQLDatabaseToolkit

[mauroalexandre]

Can I cache data about database schema instead call sql_db_list_tables in each request?

[dosubot[bot]]

@mauroalexandre Olá! Sou um bot aqui para ajudar a resolver bugs, responder perguntas e auxiliar na contribuição. Estou aqui para te ajudar enquanto aguardamos a intervenção de um mantenedor humano.

I found a similar unsolved discussion titled Cache table info on SQLDatabase ^[1].

Regarding your question, the LangChain framework provides several built-in caching utilities that you can leverage for caching database schema information. Some of these include InMemoryCache, SQLAlchemyCache, SQLiteCache, and RedisSemanticCache, among others ^[2]. You can use these caching mechanisms to store the results of sql_db_list_tables and avoid repeated calls for the same data.

The SQLDatabase class itself does not explicitly provide methods for caching schema information, but it does reflect and store metadata about the database schema using SQLAlchemy's MetaData object during initialization if lazy_table_reflection is set to False ^[3]. You can implement a caching layer on top of this to store and retrieve schema information efficiently.

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