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  Oracle Lead/Last function

  Oracle Lead/Last function 1. SyntaxPurposeFIRST and LAST are very similar functions.Both are aggregate and a

  2022-06-01 10:46:05 Views: 296
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  Mycat network communication module source code

  Mycat user's manual: system Iamp O can be divided into blocking type, non-blocking synchronous type and non-blocking asynchronous type. Blocking Ihamdo O means that control will not be returned to the caller until the calling operation is over. As a result, the caller was blocked and couldn't do anything else during this time. More

  2022-06-01 10:46:04 Views: 254
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  Concurrency Control and transaction of MySQL

  Concurrency control lock granularity: table-level lock row-level lock: read lock: shared lock, read-only non-writable, multiple reads do not block each other, write lock: exclusive lock, exclusive lock, one write lock will block other read and write locks to achieve storage engine: self-implement its lock strategy and lock granularity server level: achieve locks, table-level locks; users can explicitly please

  2022-06-01 10:45:55 Views: 272
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  How to check the version in redis

  How do I check the version in redis? I believe that many inexperienced people are at a loss about this, so this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem. First find your redis installation directory, as shown in the picture, and then open the computer's start window and type c

  2022-06-01 10:45:37 Views: 272
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  How to create a sql database

  Today, I will talk to you about how to create a sql database, many people may not know much about it. In order to make you understand better, the editor summarizes the following content for you. I hope you can get something according to this article. Sql create a database step: log in and select the database, then right-click the new database

  2022-06-01 10:45:16 Views: 249
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  MySQL- multi-instance configuration

  1.1 MySQL instance-Multi-instance configuration 1.1.1 Multi-instance Overview multiple background processes + threads + memory structure multiple ports, multiple configuration files, multiple log files, multiple socket, multiple server_id multiple sets of data # # PS: before installing multiple instances, first

  2022-06-01 10:45:15 Views: 230
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  Explain in detail how redis implements distributed locks

  What the editor wants to share with you this time is to explain in detail how redis implements distributed locks. The article is rich in content. Interested friends can learn about it. I hope you can get something after reading this article. With the continuous expansion of the preface system, distributed lock is the most basic guarantee. It is different from multithreading on a single machine.

  2022-06-01 10:45:15 Views: 229
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  Rman combined with netbackup redirect to restore oracle database

  1. Create database directory 2. Copy the pfile file from the original host and change oracle_sidvi. Bash _ profilesource. Bash _ profile3. Boot data to nomount status $sqlplus

  2022-06-01 10:45:15 Views: 301
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  Summarize the basic knowledge points of MySql database

  This article is mainly for you to summarize the basic knowledge points of MySql database, the content is easy to understand, I hope you can learn, after learning, there will be a harvest, the following let the editor take you to take a look at it. This paper describes the basic knowledge points of MySql database with an example. Share it with you.

  2022-06-01 10:44:59 Views: 261
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  DB2 offline full backup original path recovery

  1. Use db2ckbkp-h to check the backup file [db2inst1@ESB-DB-J5 home] $db2ckbkp-hDMSDEV.0.db2inst.NODE0000.CATN0000.20160

  2022-06-01 10:44:59 Views: 265
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  PXC DDL operation blocking write

  = = case 1 session1:session2:session3: conclusion: when PXC is performing DDL, in order to ensure the consistency of node data, the whole cluster rejects write operations. Note that all table write operations in the cluster cannot provide write services, but read operations can.

  2022-06-01 10:44:41 Views: 241
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  The ORACLE-016:ora-01720 authorization option does not exist for & # 39 × xxxxauthorization authorization 39;

  The error is reported as follows: a user: view V_AB user: view vault B, and used V_AC user: need to use vault B, authorization process, A user: grant select on vault A to BB user: grant select on

  2022-06-01 10:44:38 Views: 218
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  MHA+Atlas architecture building

  First, based on the disadvantages of ordinary master-slave replication, MHA can automatically complete the database failover operation within 10 to 30 seconds, and in the process of failover, MHA can ensure the consistency of data to the greatest extent to achieve high availability in the real sense. Second, architecture third, software introduction

  2022-06-01 10:44:38 Views: 292
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  Trove upgrade source code reading

  Trove upgrade is used to update the database from one version to another, such as changing mysql5.5 to mysql5.6trove/taskmanager/manager.py 368th line def upg

  2022-06-01 10:44:38 Views: 224
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  Mongodb master-slave replication configuration

  Master-slave replication is the most commonly used replication method in mongodb, which is very flexible. Can be used for backup, fault recovery, read expansion and so on. The most basic way to set up is to establish a master node and one or more slave nodes, each slave node should know the address of the master node. We realize the master and slave in two ways.

  2022-06-01 10:44:37 Views: 267
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  U2L has become popular, why can dawning steal the limelight of VMware?

  Promote IT applications from a closed architecture to an open architecture represented by x86 platform, referred to as U2L (Unix to Linux). In the past 3 years, VMware has been actively promoting the process of U2L in China and has obtained good feedback from users and the market. If you really want to set up a

  2022-06-01 10:44:37 Views: 259
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  How to separate sql database

  This article will explain in detail how to separate the sql database, the content of the article is of high quality, so the editor will share it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article. Sql database separation: log in to the sql database console and find

  2022-06-01 10:44:31 Views: 268
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  How to use redis

  In this issue, the editor will bring you about how to use redis. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article. After installing redis, enter "redis-cli" on the command line and enter "a"

  2022-06-01 10:44:20 Views: 291
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  How to check if redis is installed in linux

  In this issue, the editor will bring you about how to check whether to install redis in linux. The article is rich in content and analyzes and narrates it from a professional point of view. I hope you can get something after reading this article. Redis is a key-value storage system. And

  2022-06-01 10:44:20 Views: 232
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  What are the problems with database transaction processing

  What are the problems with database transaction processing? Many novices are not very clear about this. In order to help you solve this problem, the following editor will explain it in detail. People with this need can come and learn. I hope you can gain something. Some summaries about mysql transaction processing: 1. What is a transaction?

  2022-06-01 10:44:20 Views: 216