为什么 Azure SQL sys.event_log table 中没有 "additional_data"？

Question

我有 Azure SQL 数据库

服务器版本V12 基本定价层（5 个 DTU）

经过几次死锁后，table sys.event_log 中的 additional_data 列中没有任何信息。

运行 "master" 数据库上的以下脚本：

SELECT * FROM sys.event_log WHERE event_type = 'deadlock'

Answer 1

从Official documentation，我可以看到：

The following query returns all deadlock events for database Database1 (applies only to Azure SQL Database V11).

SELECT * FROM sys.event_log   
WHERE event_type = 'deadlock'   
    AND database_name = 'Database1';

The following query returns all deadlock events for database Database1 (applies only to Azure SQL Database V12).

WITH CTE AS (  
       SELECT CAST(event_data AS XML)  AS [target_data_XML]   
   FROM sys.fn_xe_telemetry_blob_target_read_file('dl', null, null, null)  
)  
SELECT target_data_XML.value('(/event/@timestamp)[1]', 'DateTime2') AS Timestamp,  
target_data_XML.query('/event/data[@name=''xml_report'']/value/deadlock') AS deadlock_xml,  
target_data_XML.query('/event/data[@name=''database_name'']/value').value('(/value)[1]', 'nvarchar(100)') AS db_name  
FROM CTE

为什么 Azure SQL sys.event_log table 中没有 "additional_data"？

Why there is no "additional_data" in Azure SQL sys.event_log table?

sql-server

azure

azure-sql-database

azure-sql-server