追踪框架

正如“跟踪框架”页面中所解释的那样，SmartEDB 提供了允许应用程序将跟踪和调试信息输出到日志文件的 API。有关各种跟踪选项的详细信息，请查看 C API 跟踪框架页面。对于 xSQL，这些选项在配置文件的 trace_params 部分中指定。 

配置文件示例

以下配置文件示例展示了如何设置各种跟踪选项：

    # Tracing parameters
    trace_params : 
    {
        # Specifies filename where tracing will go. It's possible to specify "stderr" 
        # to pass all the messages to standard error stream
        file : "xsql.log",
 
        # Format for the messages. Format specifiers are:  %s and  %e
        format: "%s:  %e",
 
        # Maximum severity for messages appearing in the trace file
        # Possible values are: verbose, debug, info, notice, warning, error, fatal
        severity: info
 
        # Options that control if the file will be closed and reopened for each written record.
        # Possible values are: leave_opened, keep_closed
        options: keep_closed
    }