MySQL index design principles

MySQL index design principles 1. The index column to be searched is not necessarily the column to be selected. In other words, the column most suitable for indexing is the column that appears in the WHERE clause or the column specified in the join

Oracle 11g R2 (GI) Startup Process

Oracle 11g R2 (GI) Startup Process 11gR2 cluster management software (GI) startup sequence and diagnostic methods In this article, we will introduce the Starting sequence of 11gR2GI and introduce common problems and corresponding solutions during GI

Data warehouse design purpose and data warehouse design purpose

Data warehouse design purpose and data warehouse design purpose The purpose of data warehouse design or the criteria for measuring success: 1. The data warehouse must make the information of the Organization easy to access. 2. The data warehouse

When installing oracle10g, libXp. so.6: cannot open shared object file, export dobject

When installing oracle10g, libXp. so.6: cannot open shared object file, export dobject   The following error occurs when installing oracle10g: [oracle10@rac1 clusterware]$ ./runInstaller ***************************************************************

Solution to plsql Database Password Expiration: plsql expiration

Solution to plsql Database Password Expiration: plsql expiration Recently, when logging on to plsql, the system prompts your password has experied, asking you to change the Database password. The solution is as follows: 1. When logging on to plsql,

Redis source code analysis (5) --- sparkline micro-line chart, redissparkline

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Mysql multi-log table result set splicing stored procedure, mysql Stored Procedure

Mysql multi-log table result set splicing stored procedure, mysql Stored Procedure Generally, a single-day log only records the log information of the current day. If you need to view the log information within January, You Need To splice the result

Why is the full table scan COST (COST) divided by sreadtim and costsreadtim?

Why is the full table scan COST (COST) divided by sreadtim and costsreadtim? The cost of full table scan is calculated as follows: Cost = ( #SRds * sreadtim + #MRds * mreadtim + CPUCycles / cpuspeed ) / sreadtim During

Summary of common mysql commands and summary of common mysql commands

Summary of common mysql commands and summary of common mysql commands# Modifying Field TypesAlter table 'table _ name' modify column ip varchar (50 );# Adding fieldsAlter table 'table _ name' add ip varchar (50 );# Add a primary key (primary key

Database Table naming rules and database table naming rules

Database Table naming rules and database table naming rules 1. Table names are generally implemented using [module name_specific table name]. The prefixes of the same module are the same. (Oracle is case sensitive. You do not need to use "_" in SQL,

Adjust the redo log file size in oracle rac, racredo

Adjust the redo log file size in oracle rac, racredoAdjust the size of the redo log file under rac(1) view the current log information:Select * from v $ logfile;(The path in step 2 can be seen in the MEMBER column here. The redo file name is named

Rman database recovery; key/non-key files, image copies, control files, restore points, non-archive, incremental, new databases, catastrophic replies, and rman copies

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Practice: mysql version upgrades

Practice: mysql version upgrades   /*************************************** * ************ Upgrade mysql to 5.6.21 ********************* * ******************************/backup is required before the upgrade! ---- 1. view the data directory location

Rman backup method-Incremental backup and rman backup method incremental

Rman backup method-Incremental backup and rman backup method incremental Usage type: the system load is concentrated in a certain period of time, such as 8 hours during the day, and is usually idle at night. Therefore, data can be backed up at night.

Develop CRUD with Mybatis annotation and crud with mybatis Annotation

Develop CRUD with Mybatis annotation and crud with mybatis Annotation The previous article demonstrated how to use XML to operate Mybatis to implement CRUD, but writing a large number of XML configuration files is very annoying. Therefore Mybatis

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[Mongo] group statistics time: aggregate, group, distinct, mongoaggregate

[Mongo] group statistics time: aggregate, group, distinct, mongoaggregateSome records recorded by date in development require statistics in various dimensions, such as day, month, year, and hour ,.. For Grouping statistics, some fields need to be de-

SQL and SQL tutorials

SQL and SQL tutorials The SQL statement is as follows: Update mapping_nj_roadsSet municipality = '000000'From mapping_geodata_boundaryWhere a. supportfile_code = '20140901' and(A. boundary. STContains (mapping_nj_roads.geom) = 1 or a. boundary.

Refresh a simple passwd file for linux commands and passwd for linux commands

Refresh a simple passwd file for linux commands and passwd for linux commands **************************************** ******************************** *************************************** Original Works are from the blog of "Deep Blue blog". You

ORA-38760: This database instance failed to turn on flashback database, ora-38760flashback

ORA-38760: This database instance failed to turn on flashback database, ora-38760flashbackORA-38760: This database instance failed to turn on flashback databaseProblem Background:Test the database to execute shutdown immediate, the log reports an

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