今天发布Web项目,结果运行出错,错误信息如下: [COMException (0x800736b1): 由于应用程序配置不正确,应用程序未能启动。重新安装应用程序可能会纠正这个问题。 (Exception from HRESULT: 0x800736B1)] [FileLoadException: Could not load file or assem
今天发布Web项目,结果运行出错,错误信息如下:
[COMException (0x800736b1): 由于应用程序配置不正确,应用程序未能启动。重新安装应用程序可能会纠正这个问题。 (Exception from HRESULT: 0x800736B1)]
[FileLoadException: Could not load file or assembly 'Microsoft.SqlServer.BatchParser, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. 由于应用程序配置不正确,应用程序未能启动。重新安装应用程序可能会纠正这个问题。 (Exception from HRESULT: 0x800736B1)]
在网上搜索了半天,有不少人遇到这个问题,可惜没人解决……
只好自己想法处理,因为上周这个虚拟目录还能正常访问,并发现,别的虚拟目录都能正常访问
只有这个虚拟目录因为刚刚更新,不能打开任何页面,所以肯定是这个目录下有问题,而不是服务器问题
首先怀疑是Web.config问题,删除Web.config,问题依旧
接着怀疑是bin目录,进入bin目录,发现一个奇怪的dll文件:Microsoft.SqlServer.BatchParser.dll
删除之,OK,项目能正常运行了,
可是为什么会多出这个Microsoft.SqlServer.BatchParser.dll文件呢?而且每次生成,都会添加这个文件!!!
查看源代码引用,发现是项目里不知道什么时候添加了:
Microsoft.VisualStudio.TeamSystem.Data.UnitTesting
和
Microsoft.VisualStudio.QualityTools.UnitTestFramework
2个引用,
再查源代码历史记录,找到添加这2个引用的同事,他说他给项目添加新项时,误操作,点了添加数据库单元测试,后来删除了那个单元测试,可是没想到引用还在……
至此,原因也找到了,解决方法,删除那2个引用,还有一个自动生成的Databaseset.cs文件
再生成,没有问题了…………

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB

MySQL/InnoDB supports four transaction isolation levels: ReadUncommitted, ReadCommitted, RepeatableRead and Serializable. 1.ReadUncommitted allows reading of uncommitted data, which may cause dirty reading. 2. ReadCommitted avoids dirty reading, but non-repeatable reading may occur. 3.RepeatableRead is the default level, avoiding dirty reading and non-repeatable reading, but phantom reading may occur. 4. Serializable avoids all concurrency problems but reduces concurrency. Choosing the appropriate isolation level requires balancing data consistency and performance requirements.

MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.

MySQL index cardinality has a significant impact on query performance: 1. High cardinality index can more effectively narrow the data range and improve query efficiency; 2. Low cardinality index may lead to full table scanning and reduce query performance; 3. In joint index, high cardinality sequences should be placed in front to optimize query.

The MySQL learning path includes basic knowledge, core concepts, usage examples, and optimization techniques. 1) Understand basic concepts such as tables, rows, columns, and SQL queries. 2) Learn the definition, working principles and advantages of MySQL. 3) Master basic CRUD operations and advanced usage, such as indexes and stored procedures. 4) Familiar with common error debugging and performance optimization suggestions, such as rational use of indexes and optimization queries. Through these steps, you will have a full grasp of the use and optimization of MySQL.

MySQL's real-world applications include basic database design and complex query optimization. 1) Basic usage: used to store and manage user data, such as inserting, querying, updating and deleting user information. 2) Advanced usage: Handle complex business logic, such as order and inventory management of e-commerce platforms. 3) Performance optimization: Improve performance by rationally using indexes, partition tables and query caches.


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