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  Mysql gap lock Gap Lock

  MySQL InnoDB supports three row locking methods: row locks (Record Lock): locks are added directly to index records. Gap Lock: the lock is added to a free space that does not exist, either between two index records or the first index record

  2022-06-01 08:24:24 Views: 252
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  View lock table in Oracle

  / * query all locked data * / SELECT object_name, machine, s.sid, s.serial#FROM gv$locked_object l, dba_objects o, gv$

  2022-06-01 08:24:24 Views: 290
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  Oracle series: (5) select clause

  Use the emp table below the scott user to test 0 and set the environment-- the following code is to display the emp table and set up col empno for 9999posicol ename for a10 countries job for a10

  2022-06-01 08:24:24 Views: 249
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  Installation instructions for MySQL sub-library and sub-table tool oneproxy

  Oneproxy database middleware description # wget http://www.onexsoft.com/software/oneproxy-rhel5-linux64-v6.0.0-ga.tar.gz#tar-

  2022-06-01 08:24:12 Views: 224
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  Installation and use of Oracle-11g

  1. Installation and use of Oracle11g. Large relational database (Emurr diagram) 2. Oracle (Java) 3.UNIX, Linux, Windows support 4.Oracle distribution 5. 5. Database (software + database) MySQL6. By default, only

  2022-06-01 08:24:08 Views: 282
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  MySQL MHA failover process

  1. Switching process [root@es3 ~] # masterha_check_repl-- conf=/root/app1.cnf Tue Aug 20 10:22:41 2019-[warning] G

  2022-06-01 08:24:08 Views: 280
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  Centos7 installs mysql Community Edition

  Centos7 installs mysql Community Edition 1. Visit https://dev.mysql.com/downloads/repo/yum/ to get mysql yum sourcewget wget https://d

  2022-06-01 08:24:07 Views: 242
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  SWAP_JOIN_INPUTS Oracle Hint

  Swap_join_inputs is a hint for hash joins. It means to let the optimizer exchange the order of the driven tables and driven tables of the original hash join, that is, to change the driven table of the original hash join into the driven table of the original hash join while still going the hash join.

  2022-06-01 08:24:07 Views: 226
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  Design of privilege Management of Spring + Struts2 + ExtJs (1) Design of Database

  1. The background of the system uses mysql database, SSH framework, and the front end is realized by ExtJs. Because the system needs to use rights management, so make this record, rights management is accurate to every button on the front end, and even every action request. Don't talk too much nonsense, just get to the point

  2022-06-01 08:24:07 Views: 244
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  SqlServer Series Notes-View

  An overview of what a view is a view is a database object created based on a query in which one or more tables can be referenced. A view is a virtual table that can be used to map a subset of one or more tables. Its content is defined by a query statement as a data object of a database and does not store data.

  2022-06-01 08:24:07 Views: 253
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  11g Clone installation for Oracle Learning

  If you need to install more database servers, it is still slow and troublesome to install database software graphically. Oracle 11g provides a way to install Clone. The steps are as follows: install Oracle on server A using the normal method.

  2022-06-01 08:24:06 Views: 206
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  Java concurrently inserts data into oracle

  Technical cattle, ask java multithreading problem due to project needs, need to migrate table records from oracle to dept2, dept and dept2 table structure is the same. Imagine: query: Statement stmt = conn.cr

  2022-06-01 08:24:06 Views: 263
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  RAC for Oracle Learning (4) install Oracle software

  Upload the installation package to 11grac1 and extract the installation package [root@11grac1 database] # unzip p10404530_112030_Linux-x86-64_1of7.zip [root@11gra]

  2022-06-01 08:23:36 Views: 207
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  Critical business on the cloud? No kidding. All these companies are doing it.

  A true story. A financial and insurance group, one of the seven largest insurance groups in China, ranks among the top 500 in the world and is regarded by others as the absolute "big financier". The financial and insurance group has done two major things in recent years: the first thing is to get an Internet insurance license in 2015 and begin to engage in online insurance-related business.

  2022-06-01 08:23:33 Views: 282
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  Oracle 12.2 install sample schema

  Some sample SCHEMA, such as HR, OE, SH, etc. are used when doing Oracle database experiments. In the Oracle11g version, you can install these sample SCHEMA by directly checking Sample Schemas in DBCA, as shown in the following figure.

  2022-06-01 08:23:23 Views: 279
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  Chapter 2 install and upgrade MySQL

  2.1 General installation Wizard 2.1.1 decides which version of mysql2.1.2 to install how to get MySQL2.1.3 installation layout Layouts (layout) 2.1.4 compile specified feature Compiler-Specific B

  2022-06-01 08:23:22 Views: 275
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  When creating a database, make it support Chinese and special characters

  You can use it this way when setting up a database, CREATE DATABASE test DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci.

  2022-06-01 08:23:04 Views: 210
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  PMM of MySQL-MongoDB open source monitoring weapon

  Recently, it is necessary to improve the monitoring system of the database. It is found that Percona Monitoring and Management (PMM), an open source monitoring tool of Percona, is more comprehensive and accurate for the monitoring indicators of MySQL.

  2022-06-01 08:23:04 Views: 255
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  Basics of getting started with Mysql (1)-- & basic introduction to gt;

  The first chapter is an overview of the database (Alvin) 1.1. a brief introduction of 1.2.It is simple to say. Database (database) is a warehouse for storing data, so for convenient storage and management, it stores data on disk according to specific rules. Through the database management system, it can

  2022-06-01 08:23:03 Views: 231
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  Generate a 16062801 format number based on the current date

  A previous post: generate a number according to the date, and the link is as follows: http://plat.delit.cn/forum.php?m. Hlight=%B1%E0%BA%C5 customers are now asking for the first two numbers of the year to be removed; so

  2022-06-01 08:23:03 Views: 212