Database Administrator

How to start and cut MongoDB system logs When the mongos routing service is enabled during mongodb sharding, a log storage location is specified:1 mongos -- configdb 127.0.0.1: 27019 -- logpath/var/log/mongodb/mongos. log --

Mysql Study Notes (log management), mysql Study Notes Logs: mysql logs that record the running status, daily operations, and error information of the database: Binary logs, error logs, and query logs. Binary log: records database operations in

Optimization of a complex subquery SQL statement and a complex subsql statement Select * from test. vmark vk where id in (select v. id from usr_center.vmark_degree_update_log v, (select min (id) id from usr_center.vmark_degree_update_log where

01. Get started with JDBC and basic knowledge about stocksReprinted please indicate the source: http://blog.csdn.net/u012637501I. Getting started with JDBC1. JDBC IntroductionJDBC is Java Database Connectivity. JDBC provides a standard API for tools/

In the. Net project, the Oracle database configuration is linked through ODAC, And the odacoracle  In the. Net project, use ODAC to link Oracle Database configurations I. Development Environment 1. ODAC connection method ODAC directly uses Oracle to

The MySQL date type and millisecond value are converted to each other. Sometimes the date type value needs to be converted to the millisecond value, and sometimes the millisecond value needs to be converted to the date, for more convenience, meet

Error 1313: RETURN is only allowed in a function SQL Statement, 1313 allowed 1. Error description 14: 07: 26 Apply changes to rand_stringError 1313: RETURN is only allowed in a function SQL Statement: CREATE PROCEDURE 'rand _ string' (n int)

MySQL Study Notes _ 10_MySQL Advanced Operations (below) and study notes _ 10_mysql MySQL Advanced Operations (below) V. MySQL pre-processing statements 1. Set the pre-processing stmt and pass a data as the where judgment condition. Prepare stmt

Orecle returns an error when deleting a table ORA-24005: using an inappropriate utility to execute DDL, orecleora-24005 on the aq table ** Recently, I want to copy the entire database from the server. Therefore, a new database is created locally.

Secondary index of the Aerospike-Architecture series, aerospikeSecondary Index (Secondary Index) The secondary index is built on a non-primary key to give the model a one-to-multiple relationship. The index is specified based on bin (similar to

Purpose: Use bbed to change the scn information of datafile 5 that has been offline to the same as that of other datafiles ., Bbeddatafile Standard Reference self: http://www.xifenfei.com/1527.html   Objective: to change the scn information of

From ORM to talk about data persistence and orm  What is ORM? ORM (ObjectRelational Mapping) object-relational ing is generated with the development of object-oriented software. ORM is a program technology used to convert data of different types of

(11) condition definition and processing in mysql, 11 mysql Overview In MySQL, specific exceptions must be handled. These exceptions can be associated with errors and general process control in subprograms.Definition exceptionIt is a problem

PostgreSQL tutorial (19th): SQL language functions, postgresqlsql I. Basic concepts: SQL functions can contain any number of queries, but the function returns only the results of the last query (which must be SELECT. In simple cases, the first row

SqlServer changes the parameters of the replication agent configuration file, and the sqlserver configuration file Because you often need to synchronize the test and change the attributes of the agent configuration file, it is summarized as a script

[Mysql] mysql database Common commands, mysql database Common commands1. Database authorization Go to the mysql database: mysql> use mysql; set a new password for the root user: mysql> update user set password = password ("new password") where user =

The restoration of RAC when the OCR disk is faulty and there is a backup, racocr Problem description: CRS startup failed, and all RAC processes quit. View the messages log: ...... Apr 10 15:58:31 node74 logger: Cluster Ready Services waiting on

Xtrabackup automatic restore script v2 and xtrabackup script v2Xtrabackup Automatic Restoration**************************************** **************************************** ****************Application scenarios:***********************************

ORA-19815, Flashback Logs-Space management, ORA-19815, Flashback Logs-Space management (Doc ID 369755.1) Applicable:Oracle Database-Enterprise Edition-Version 10.1.0.2 to 11.2.0.3 [Release 10.1 to 11.2]Information in this document applies to any

Install mysql in linux [practice edition] And linuxmysql practice Edition [Environment and file version] Red hat linux v6.2 Mysql linux x86-x64 v5.6 [Prepare required files] First, go to the official website to download the linux version of mysql.