Retrieve OceanBase database connection information.
If no parameters are provided, the configuration is loaded from environment variables.
Otherwise, user-defined connection parameters will be used.

:param host: Database host address. Defaults to environment variable OB_HOST or "localhost".
:param port: Database port number. Defaults to environment variable OB_PORT or "2881".
:param user: Database username. Required. Defaults to user input or environment variable OB_USER.
:param password: Database password. Required. Defaults to user input or environment variable OB_PASSWORD.
:param database: Database name. Required. Defaults to user input or environment variable OB_DATABASE.
:return: A dictionary containing the database connection configuration.
:raises ValueError: Raised if any of the required parameters (user, password, database) are missing.

Get OceanBase Active Session History report.
ASH can sample the status of all Active Sessions in the system at 1-second intervals, including:
    Current executing SQL ID
    Current wait events (if any)
    Wait time and wait parameters
    The module where the SESSION is located during sampling (PARSE, EXECUTE, PL, etc.)
    SESSION status records, such as SESSION MODULE, ACTION, CLIENT ID
This will be very useful when you perform performance analysis.RetryClaude can make mistakes. Please double-check responses.

This tool is designed to provide context-specific information about OceanBase to a large language model (LLM) to enhance the accuracy and relevance of its responses.
The LLM should automatically extracts relevant search keywords from user queries or LLM's answer for the tool parameter "keyword".
The main functions of this tool include:
1.Information Retrieval: The MCP Tool searches through OceanBase-related documentation using the extracted keywords, locating and extracting the most relevant information.
2.Context Provision: The retrieved information from OceanBase documentation is then fed back to the LLM as contextual reference material. This context is not directly shown to the user but is used to refine and inform the LLM’s responses.
This tool ensures that when the LLM’s internal documentation is insufficient to generate high-quality responses, it dynamically retrieves necessary OceanBase information, thereby maintaining a high level of response accuracy and expertise.