如何读取扩展事件.xel文件

Question

我对读取/解析扩展事件文件.xel文件有一定的要求，我该如何有效地做到这一点。我的一位同事建议使用API​​来解析文件，但是我认为应该有一种方法可以通过SQL代码本身来实现。非常感谢帮助。

Answer 1

要读取.xel文件，可以使用sys.fn_xe_file_target_read_file函数。例如：

select cast(event_data as XML) as event_data
from sys.fn_xe_file_target_read_file('D:\Folder\MySession*.xel', null, null, null)

Further you may want to parse the returned XML to get the data in table format. To do this, you need to decide what data to extract from the XML and write the appropriate XPath expressions. For example:

-- You have to know element names and their data types
select
    n.value('(@name)[1]', 'varchar(50)') as event_name,
    n.value('(@package)[1]', 'varchar(50)') AS package_name,
    n.value('(@timestamp)[1]', 'datetime2') AS [utc_timestamp],
    n.value('(data[@name="duration"]/value)[1]', 'int') as duration,
    n.value('(data[@name="cpu_time"]/value)[1]', 'int') as cpu,
    n.value('(data[@name="physical_reads"]/value)[1]', 'int') as physical_reads,
    n.value('(data[@name="logical_reads"]/value)[1]', 'int') as logical_reads,
    n.value('(data[@name="writes"]/value)[1]', 'int') as writes,
    n.value('(data[@name="row_count"]/value)[1]', 'int') as row_count,
    n.value('(data[@name="last_row_count"]/value)[1]', 'int') as last_row_count,
    n.value('(data[@name="line_number"]/value)[1]', 'int') as line_number,
    n.value('(data[@name="offset"]/value)[1]', 'int') as offset,
    n.value('(data[@name="offset_end"]/value)[1]', 'int') as offset_end,
    n.value('(data[@name="statement"]/value)[1]', 'nvarchar(max)') as statement,
    n.value('(action[@name="database_name"]/value)[1]', 'nvarchar(128)') as database_name
from (select cast(event_data as XML) as event_data
from sys.fn_xe_file_target_read_file('D:\Folder\MySession*.xel', null, null, null)) ed
cross apply ed.event_data.nodes('event') as q(n)