该参数控制由连接池缓存的最大预编译语句数。
This parameter controls the maximum number of prepared statements cached by a connection pool.
预编译语句的自动重新编译。
当执行预编译语句时，IDS检测底层对象的变化，必要时重新准备(重新编译)语句。
When you execute a prepared statement, IDS now detects changes to underlying objects and re-prepares (re-compiles) the statement if needed.
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