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When we create a PreparedStatement object is it cached on the server side? How it is different comparing to PreparedStatement in Oracle driver? If prepared statement is reused, what data is sent to Cassandra server, param values only?
From what I understand, one Session object in java driver holds multiple connections to multiple nodes in cluster. If we reuse the same prepared statement in our application in multiple threads, will make us using only one connection to one Cassandra? I guess preparing statement is done on one connection only... What happens when routing key is updated by each execute call?
What are benefits of using prepared statements?
Thank you
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A prepared statement is a cassandra query that has been pre-parsed and validated by the cassandra database. Ideally you prepare a query once, and then use it many times by binding values to binding variables in the query.
Prepared statements offer two major benefits: The query only needs to be parsed (or prepared) once, but can be executed multiple times with the same or different parameters. When the query is prepared, the database will analyze, compile and optimize its plan for executing the query.
In general, PreparedStatement provides better performance than Statement object because of the pre-compilation of SQL query on the database server. When you use PreparedStatement, the query is compiled the first time but after that it is cached at the database server, making subsequent run faster.
A prepared statement with values bound to the bind variables. Once values has been provided for the variables of the PreparedStatement it has been created from, such BoundStatement can be executed (through Session. execute(Statement) ). The values of a BoundStatement can be set by either index or name.
Yes, only the statement ID and parameters need to be sent after preparing the statement.
The driver tracks statement IDs for each server in its connection pool; it's transparent to your application.
The benefit is improved performance from not having to re-compile the statement for each query.
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