sql server log文件

确定 SQL Server 实例中具有大量 VDF 的数据库

sql 复制代码
SELECT [name], COUNT(l.database_id) AS 'vlf_count' 
FROM sys.databases AS s
CROSS APPLY sys.dm_db_log_info(s.database_id) AS l
GROUP BY [name]
HAVING COUNT(l.database_id) > 100;

在收缩日志文件之前确定事务日志中最后一个 VLF 的位置

在对事务日志运行 SHRINK FILE 之前,可以使用以下查询来确定最后一个活动 VLF 的位置,以确定事务日志是否可以收缩。

sql 复制代码
 

;WITH cte_vlf AS (
SELECT ROW_NUMBER() OVER(ORDER BY vlf_begin_offset) AS vlfid, DB_NAME(database_id) AS [Database Name], vlf_sequence_number, vlf_active, vlf_begin_offset, vlf_size_mb
    FROM sys.dm_db_log_info(DEFAULT)),
cte_vlf_cnt AS (SELECT [Database Name], COUNT(vlf_sequence_number) AS vlf_count,
    (SELECT COUNT(vlf_sequence_number) FROM cte_vlf WHERE vlf_active = 0) AS vlf_count_inactive,
    (SELECT COUNT(vlf_sequence_number) FROM cte_vlf WHERE vlf_active = 1) AS vlf_count_active,
    (SELECT MIN(vlfid) FROM cte_vlf WHERE vlf_active = 1) AS ordinal_min_vlf_active,
    (SELECT MIN(vlf_sequence_number) FROM cte_vlf WHERE vlf_active = 1) AS min_vlf_active,
    (SELECT MAX(vlfid) FROM cte_vlf WHERE vlf_active = 1) AS ordinal_max_vlf_active,
    (SELECT MAX(vlf_sequence_number) FROM cte_vlf WHERE vlf_active = 1) AS max_vlf_active
    FROM cte_vlf
    GROUP BY [Database Name])
SELECT [Database Name], vlf_count, min_vlf_active, ordinal_min_vlf_active, max_vlf_active, ordinal_max_vlf_active,
((ordinal_min_vlf_active-1)*100.00/vlf_count) AS free_log_pct_before_active_log,
((ordinal_max_vlf_active-(ordinal_min_vlf_active-1))*100.00/vlf_count) AS active_log_pct,
((vlf_count-ordinal_max_vlf_active)*100.00/vlf_count) AS free_log_pct_after_active_log
FROM cte_vlf_cnt;
GO

查看log 大小

sql 复制代码
select mf.name,
mf.type_desc,
mf.state_desc,
mf.size*8.0/1024 as 'SIZE_MB',
max_size/128 as 'MAXSIZE_MB' 
from sys.master_files mf
where   mf.type_desc='LOG' ;

参考:

sys.dm_db_log_info (Transact-SQL) - SQL Server | Microsoft Learn

相关推荐
好奇的菜鸟2 小时前
如何在IntelliJ IDEA中设置数据库连接全局共享
java·数据库·intellij-idea
tan180°2 小时前
MySQL表的操作(3)
linux·数据库·c++·vscode·后端·mysql
满昕欢喜2 小时前
SQL Server从入门到项目实践(超值版)读书笔记 20
数据库·sql·sqlserver
Hello.Reader4 小时前
Redis 延迟排查与优化全攻略
数据库·redis·缓存
简佐义的博客4 小时前
破解非模式物种GO/KEGG注释难题
开发语言·数据库·后端·oracle·golang
爬山算法4 小时前
MySQL(116)如何监控负载均衡状态?
数据库·mysql·负载均衡
老纪的技术唠嗑局7 小时前
OceanBase PoC 经验总结(二)—— AP 业务
数据库
阿里云大数据AI技术8 小时前
OpenSearch 视频 RAG 实践
数据库·人工智能·llm
m0_6239556610 小时前
Oracle使用SQL一次性向表中插入多行数据
数据库·sql·oracle
阿蒙Amon10 小时前
C#读写文件:多种方式详解
开发语言·数据库·c#