Database Administrator

ORA-12154: TNS: unable to resolve the specified connection identifier resolved I believe that people who have used Oracle databases must have encountered the "ORA-12154: TNS: unable to resolve the specified connection identifier" error, I would like

ORA-12853 and ORA-04031 large pool insufficiency error resolved ORA-12801: error signaled in parallel query server P139 ORA-12853: insufficient memory for PX buffers: current 274880 K, max needed 19722240 K ORA-04031: unable to allocate 65560 bytes

In-depth analysis of distributed algorithms for NoSQL Databases System scalability is the main reason for promoting the development of NoSQL, including distributed system coordination, failover, resource management and many other features. In this

MongoDB Study Notes-aggregation The latest new project to use mysql has not forgotten yet. The summary records the following MongoDB aggregation. AggregationIt refers to various operations that can process batch records and return computing results.

Install PostgreSQL 14.04 on Ubuntu 9.2 I. Environment Vmvm NAME = "Ubuntu"VERSION = "12.04.4 LTS, Precise Pangolin" Ii. Process 1. Install make. Do not install make now. # Apt-get install make # Make -- versionGNU Make 3.81Copyright (C) 2006 Free

[Translated from mos] What is split-brain in Oracle Clusterware and RAC? mosclusterware What is split-brain in Oracle Clusterware and RAC? Source:What is Split Brain in Oracle Clusterware and Real Application Cluster (Document ID

SQL Server complex SQL logic implementation, SQL Server SQL Logic I. Problems For example, if you already have data in tables a and B, how can you convert it to Table c through SQL statements? Table a is a table that has the same UserName and

ERROR-Agent is blocked. Blocked reason is: Agent is out-of-sync with repository, mavenrepository [oracle@node2-prod1 bin]$ ./emctl status agentOracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0 Copyright (c) 1996, 2010 Oracle

Use excel for data mining (4) ---- highlight abnormal values and excel Data Mining Use excel for data mining (4) ---- highlight Abnormal Values After configuring the environment, you can use excel for data mining. For environment configuration

Introduction to basic statements of elasticsearch the aggregation function is powerful for analyzing data. Elasticsearch has powerful aggregation functions to analyze data, which is more powerful than MySQL. It can be categorized into sports based

Data Center reconstruction-Database Design (2), Data Center reconstruction-Database After completing the database requirements analysis, erdiagram, and relational model phases of the data room charging system, we should design the database based on

JAVA Development FAQ and java Development FAQ When the MySQL table has two field types: TIMESTAMP, the following problems often occur: Caused by: java. SQL. SQLException: Value '2017-00-00 00:00:00 'can not be represented as java. SQL. TimestampAt

Oracle cluster and cluster tables, Oracle cluster tables Oracle clusters and cluster tables A cluster consists of multiple tables that share the same data block. It stores the related rows of these tables in the same data block, which can reduce the

Correctly install the SQL server database and SQL server database-IIS function requirements (warning)MessageIIS functional requirementsMicrosoft Internet Information Service (IIS) is not installed or disabled. Some SQL Server functions require IIS.

AIX online file system expansion, aix online File expansion All said that the AIX operation is convenient, and it is not a blow. # Chfs-a size =-1G/homeFilesystem size changed to 39845888 # chfs-a size = + 1G/usrFilesystem size changed to 10485760 #

How to fix the standby database after ORACLE 11G replica uard Failover, and restore uardfailoverProblem scenarios after failover:Due to the failover test, a standby database has been changed to the primary database. How can I change this new primary

Spring dynamic multi-data source instance Demo and spring dynamic instance demo Recently, many people have consulted Spring on how to configure multiple data sources. It is troublesome to answer the questions one by one, and the configuration in

7. Basic Redis commands-task queue and redis queue1. Advantages: loose coupling is easy to expand, and consumers can expand multiple servers.2. LPUSH RPOP3. The BRPOP command is similar to RPOP. The only difference is that when there are no elements

Understanding SQL Server statistics and SQL statistics Preface SQL Server queries are based on overhead queries. When an execution plan is generated for the first time, a better execution plan is determined based on multi-stage analysis

SYBASE: sybase Basics (1) Historical versions of sybase; Sybase server 1.0 2.0, Sybase openclient/openserver, Sybase system 10, sybase replication server, Sybase SQL server 11.0, Sybase ase 11.5, Sybase ase 11.9.2, ase 11.9.3, ase 12.0, ase 12.5,