Exception Reason:1, wrote a cycle of death, this is the most likely.2, the operation of large data volume, resulting in the status of suspended animation.Solution: Managed Debug Assistants in Debug---Exceptions, remove ContextSwitchDeadlock a front hook.Exception information: The CLR cannot convert from COM context 0x645e18 to COM context 0x645f88, which has lasted for 60 seconds. The thread that owns the target context/unit is most likely to perform
1.WPF multithreaded Modification UI Example:// Start thread Modify UI, throw exception ThreadPool.QueueUserWorkItem ((q) += {" Zhang San "null);Solution: Modify the UI by using the Dispatcher.begininvoke+ delegate methodEncapsulating code that modifies the UI in a delegate// Start thread processing New true; // set to a background thread, the background thread exits automatically when the main thread ends, otherwise the program cannot end Thread1. Start ();//threading methods, modifying butt
Let's look at the code first:var s = "Test"; var len=s.length;We know that the string declared in JavaScript like above is not an object, but since S is not an object, why is there a property of length?The reason is that in JavaScript, whenever you reference a property of a string (numeric, Boolean, and so on), JS converts the string to an object by calling new string (s), which inherits the string's method and is used to handle the property's reference. Once the attribute reference is finished,
1. Create a complextype.xsd file under the D:/xml practice directory2. Download the XJC tool, which can be downloaded at the following link:http://download.csdn.net/detail/u013998070/85696673. Open the command line and adjust to the bin directory of the XJC ToolkitIf you do not know what you need to enter, you can simply enter the XJC command to view it, as followsAfter you clear the relevant commands, enter the following instructions to generate the target Java codeThe schema that
I tried some of the methods offered online, and finally I solved some problems with SQL.
1 Select the problematic database in the Query Analyzer and enter:Exec sp_configure ' allow updates ', 1--Allows the system tables to be updated.
Reconfigure with OVERRIDE
2. Run the following SQL statement:UPDATE sysobjects Set uid=1--all objects in the database are assigned to the user dbo
3. Execute the following SQL statement:
Exec sp_configure ' allow updates ', 0--Shutdown system Table update
Re
SQL database user cannot delete, prompting "the user cannot be dropped because the selected user owns the object" workaroundDue to the error of the MSSQL200 database, I restored an original database to the current SQL, at this time I came to the user, want to restore the user deleted, but the result is prompted "because the selected user has an object, so the user cannot be removed"Because PB automatically establishes the table with the logged-in user
Error: The calling thread cannot access this object because another thread owns the objectMain window Create thread, multithreading cannot call control directlyThe thread created by the main window Public MainWindow () { InitializeComponent (); New Thread (listenchange); T.start (); }Line Cheng: Public void Listenchange () { // Create a ListView item is not written, here is just an example of
Title, when a WPF child thread accesses the UI thread, assigns a value to the UI's control, and if it does not, it reports the exception: "The calling thread cannot access this object because another thread owns the object." ”The solution is as follows: // method One this. Dispatcher.invoke (Action)delegate() {// your code }); // Method Two App.Current.Dispatcher.Invoke (Action)delegate(
Error When deleting a user:
MSG 15138, level16, state 1, line 1
The Database Principal owns a schemain the database, and cannot be dropped.
Solution (SSMs ):
1. Find the user's schema
2. Find the db_owner In the schema and change the schema owner from test6 to DBO or another user.
3. delete user test6
Or use the following statement to delete the file:
--- Query the schema owned by user test6 as db_owner
Use DBA;
Select
successful. You think people are casual, in fact, it is not so. There are things that you can see only by standing on that level.In this world, there is no shortage of wise people, but wise men.6.What I want to say is that good things are always fought and sacrificed to get.Will all the good things in the world be automatically put into your arms? Will the pie in the sky just fall into my open mouth? Especially the poor people like me, my competitors are the strength of my rich, they stand high
Tags: Database SQL Server 2008When using SQL Server to Do data mining, the user can not access the problem, so to the corresponding database add a login user Zhang, and give the appropriate permissions. When debugging, found that there is still a problem, so want to delete this user Zhang, and create a new user. An error message appears : The database principal has a schema in the database and cannot be deleted. (Microsoft SQL Server, error : 15138) Solution:Delete the schema for this user, an
with it. It's like pointing to a page number through a table of contents and then flipping through page numbers to a specific content page.
The blogs and tags above are a good example: the left is the raw data, and a blog can have multiple tags. Right by inverted index makes each tag point to the blog that owns it. This way, when searching for tags, the left side can only iterate through the lookup, and the right side can directly find all the corre
Before we talked about the Elasticsearch (search engine) operation, such as: Add, delete, change, check and other operations are used Elasticsearch language commands, like SQL command, of course Elasticsearch Official also provides a python operation Elasticsearch (search engine) interface package, just like the SQLAlc
First, window installation Elasticsearch installationThe client version of Elasticsearch must be consistent with the main version of the server version.1, Java Installation "slightly" 2, Elasticsearch downloadAddress: https://www.elastic.co/downloads/past-releasesSelect the appropriate version, use elasticsearch5.4.3 download zip here3, decompression
In order to make it easier for you to find the part that you need to reference more quickly, the part that has been translated is done according to the catalogue of the authoritative guide, and I hope to be helpful. Start (Getting Started) 1. You know, to search
English original link: you Know, for Search 2. Life in the cluster
Translation Links:How the [Elasticsearch] cluster works-part I.How the [Elasticsearch
Elasticsearch-sql Plug-in
Image2017-10-27_11-10-53.png (1067x738)
Elastic sql_ Baidu Search
Parsing process for Druid SQL parser-Beanlam-segmentfault
Elasticsearch SQL | Elastic
Elasticsearch-sql SQL query Elasticsearch-heart of Old ir
Elasticsearch October 2014 briefing, elasticsearch1. Elasticsearch Updates
1.1 released Kibana 4 Beta 1 and Beta 1.1
Kibana 4 is different from Kibana in layout, configuration, and bottom-layer Chart Drawing. After learning the functional requirements of many communities based on Kibana 3, Kibana's self-Kibana 2 major change resulted in the second major change made by Kibana 3. Kibana has always been commit
Installation Preparation:The only requirement to install Elasticsearch is to install the official version of Java, including the corresponding JDK.Installing ElasticsearchFirst download the latest version of the Elasticsearch compression package to the official website.You can use the command to fill in the latest available download links:curl -L -O https://artifacts.elastic.co/downloads/
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