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mysql database security policy MySQL system itself can set password complexity and automatic expiration policy, which may be less used. Recently, I was informed to adjust the password and began to understand it mysql password complexity policy The MySQL system comes with validate_password plug-in, which can verify the password strength ...

Noun exegesis In the screenshot below, some terms need to be explained for ease of understanding and application: cuckoo is called the library name, that is, the name of the databaseusers is called the collection name, that is, the name of the colonyRight band_ Rows of IDS are called documentsAnd_ ID, username and password are called fieldsT ...

0 - problem description SQL tests whether there is a value in a group of data. You want to generate a Boolean value according to whether a group of row records contain a specific value. Imagine an example where a student will take several exams over a period of time. Suppose he takes three exams every three months. As long as he has pas ...

  Introduction: today I will bring you an e-commerce data analysis case. I sorted it out and shared it with you in the form of notes. The background of the case is that the overall sales of an e-commerce have been rising for several consecutive years, but the growth rate has slowed down in recent years. It is necessary to find effe ...

This article is written based on elastic search version 7.10. 1. The script updates a property value in the object array. In the background, the business side needs to say that the CDN acceleration is enabled for commodity pictures, and the previous picture domain names need to be modified. The picture address in the database can be updated t ...

To see which compression algorithms hadoop has [lqs@bdc112 hadoop-3.1.3]$ bin/hadoop checknative 2021-12-15 16:20:12,342 INFO bzip2.Bzip2Factory: Successfully loaded & initialized native-bzip2 library system-native 2021-12-15 16:20:12,345 INFO zlib.ZlibFactory: Successfully loaded & initialized native-zlib library 2021-12-15 16:20:12,3 ...

  DataX is an open source version of Alibaba cloud DataWorks data integration. It is an offline data synchronization tool / platform widely used in Alibaba group. DataX implements efficient data synchronization between various heterogeneous data sources, including MySQL, Oracle, SqlServer, Postgre, HDFS, Hive, ADS, HBase, TableStore(OTS), MaxC ...

1. IntroductionSqlClient is an SQL command line interaction tool provided by Flink. When downloading the blink binary package, there is a SQL client in its bin directory SH, you can enter the interactive page by starting the script. The specific source code implementation of SqlClient can be found under the Flink SQL client sub module of the Fl ...

1.partitionBy 1) Function signature def partitionBy(partitioner: Partitioner): RDD[(K, V)] 2) Function description Repartition the data according to the specified Partitioner. Spark's default Partitioner is HashPartitioner Note: partitionBy can only be called when rdd is converted to key value tuple type import org.apache.spark.{HashPartit ...

watermark introduction In Flink, Watermark is a mechanism proposed by Apache Flink to handle EventTime window calculation. It is essentially a timestamp. Used to deal with the disorder problem in real-time data, it is usually realized by the combination of waterline and window. From the generation of real-time stream events by the device, to F ...