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BY c2,c3 ORDER BY(getdate())) as numfrom duplicate_col)delete tmp where num > 1select * from duplicate_col 3. Delete massive dataWhen deleting massive data, if you want to improve performance, you need to consider an important factor: How to Reduce log operations? 1. delete a full tableThere are usually three ways to delete a full table: Drop, truncate, delete(1) Drop/truncateDrop and truncate are DDL operations, and the log volume is very small (only records on the data page are recycled, and

stream to the main running loop // if you do not add the main running loop proxy, it may not work [_ inputStream scheduleInRunLoop: [nsunloop mainRunLoop] forMode: NSDefaultRunLoopMode]; [_ outputStream scheduleInRunLoop: [nsunloop mainRunLoop] forMode: NSDefaultRunLoopMode]; // open the input/output stream [_ inputStream open]; [_ outputStream open];} Iv. Login -(IBAction) loginBtnClick :( id) sender {// log on // send the user name and password // only send the user name when you do this, you

' Line break in [+]: print ' I .... : Am Tom ...: hhha ' iam tomhhhain [254]: print ' I am \ ....: tom \ ....... HH ' I am Tom Hhin [255]: print "I\ ....: AM \ n \ ....: tom \ n" Iam tom# there is a blank line # output non-escaped string in [[]: Print R "I\ ' m Tom "I\ ' m Tom Numeric String conversions Direct use str() or int() can, nothing to say, as follows: in [n]: Print R "I\ '

A bucket was created on S3 using the AWS CLI, and the following error was reported when uploading a file:A Client Error (AccessDenied) occurred when calling the Createmultipartupload operation:anonymous users cannot initiate m Ultipart uploads. Please authenticate.Execute command: AWS S3 LS S3://mybucket-1 also prompts for permission errors.Before using the AWS CLI Operation S3 is normal, the only difference is: this time I am using an IAM user, not t

include strings. The following is an example: It can be used normally. one type can contain one string, and the other type can be included in the string (but the same type cannot be included; otherwise, it must be escaped) In [241]: print "I'm Tom" I'm TomIn [242]: print 'ABC' abcIn [243]: print "abc" abcIn [244]: print '''abc''' abcIn [245]: print '"hhh"' "hhh" In [246]: print "'Hello World'" 'hello world' In [247]: print 'I am bt 'file" ", Line 1 print 'I am bt' ^ SyntaxError: invalid

section that one is dbname, the other is tablename or viewname or procname, and the third is the most Interestingly, what does 1, 0,-1,-2 mean ??? 2 indicates the first non-clustered index, 3 indicates the second non-clustered index, and so on ..... I really don't want to give an example, because I can't say anything more... Let's take an example: Through the above figure, I think you should understand what I am doing, right ??? We can see that the data of the current non-clustered inde

. SCPB the generic number parameter in the connect operation to the special prefix (60) + The calling real number, which is sent to the MSCA/VLR/SSP via the connect operation. After receiving connect, MSCA/VLR/SSP sends the SRI message to the called HLR again, resulting in MSRN. The MSCA/VLR/SSP is continued according to the called MSRN. When the Lord is called on either side to hang up the phone means the call is over, and finally the MSCA/VLR/SSP event is reported and a statement is generated.

The Linux Server uploads files to S3 through the AWS command line PurposeThe Linux Server uploads files to S3 through the AWS command line ConfigurationOpen your AWS console; Create a new user (such as test) in IAM. When it is created, it automatically creates a user security credential consisting of an "access key ID" and "Private access key, remember it and download the credential, which will be used later; Select the user you just created and h

! [[emailprotected]oldboy]#grep-e "Oldboy|oldbey" oldboy.logIam oldboy1teacher!myblogishttp://oldboy.blog.51cto.commygod,iam notoldbey,butoldboy! [[emailprotected]oldboy]#grep-e "Old (Boy|bey)" oldboy.logIam oldboy1teacher!myblogishttp://oldboy.blog.51cto.commygod,iam notoldbey,butoldboy! metacharacters: \b Word boundaries [[emailprotected]oldboy]#grep "OLDBOY" oldboy.logiamoldboy1teacher!myblogishttp://ol

#==============================================================#配置连接数据库的实现类, you can refer to the configuration in the IAM database configuration file org.quartz.dataSource.myDS.driver=com.mysql.jdbc.Driver #配置连接数据库连接, you can refer to the configuration in the IAM database configuration file Org.quartz.dataSource.myDS.URL= Jdbc:mysql://localhost:3306/test#配置连接数据库用户名 Org.quartz.dataSource.myDS.user=Yunxi #配

First, create the end nodeWhy create endpoints and manage your vpc and S3? If you do not manage the VPC and S3 through the endpoint, the EC2 instance Access S3 bucket in the VPC is through the public network, and once associated, the EC2 instance in the VPC accesses the S3 bucket to the internal network. The benefits are two: 1. The internal network will not incur traffic costs; 2. Walking the internal network is fast and will not cause our Python script to produce an exception for network reaso

two parameters I want you to understand, I also mentioned in the previous section, one is dbname, one is tablename or viewname or procname, and so on, the third parameter is the most Interesting, what does this 1,0,-1,-2 mean??? Say 2 represents the first nonclustered index, 3 represents the second nonclustered index, and so on ... I really do not want to give an example, because further down the words, can not say ... Well, let's just give you an example: Through the above

generally common object-oriented language. The simple way to create an object is as follows: function MyObject () { }; There are generally two ways to create objects in JavaScript: The functional constructor and the literal method, which is the functional constructor above. The following is an example of a literal method: var myObject = { }; The literal method is recommended if only one object is needed, and no other instance of the object is needed. If multiple instances of

Label:--Check the index fragmentation situationDBCC SHOWCONFIG (tablename)Specific examples:--Before the defragmentationALTER INDEX all on citation REBUILD-After the defragmentation--Extents Switches:extents Scanned-1-AVG. Pages per Extent: Default 1 Zone 8 page, less than 8, with external fragmentation-AVG. Bytes free per page: The higher the value of 8000 Bytes, the greater the internal fragmentation, or the filling factor is too low;External: There are pages in the area that are not being use

This section describes how to export data from one or more dynamodb tables to S3 buckets. Before you perform the export, you need to create S3 buckets in advance.NoteIf you haven't used AWS Data Pipeline before, you'll need to create two IAM roles before executing the process below. For more information, please visit creating IAM Roles for AWS Data Pipeline.export data from Dynamodb to S3 Log in to the

Tags: tempdbCustomer needs:This is a production environment, in the dead of night to find tempdb has more than 500GB.Requirements Analysis:We know that if the restart of SQL server,tempdb is automatically recreated, the tempdb returns to its initial size. However, this is a production environment and does not allow the restart of SQL Server.Try:Directly shrinks tempdb, and is not always successful. Use [tempdb]GODBCC shrinkfile (N ' tempdev ', 0, truncateonly)--Free all available

Tags: information application rom creat AWS Evel splay rules DynamodbThis section describes how to export data from one or more dynamodb tables to S3 buckets. Before you run the export, you need to create S3 buckets in advance. NoteAssuming you haven't used AWS Data Pipeline before, you'll need to create two IAM roles before running the following process. For a lot of other information, please go to Creating IAM