Database Administrator

[Root @ localhost ~] # MongoMongoDB shell version: 1.8.1Connecting to: test> DbTest> Show collectionsData_testSystem. indexesSystem. users> Db. data_test.find (). skip (3). limit (4) // query by PAGE, starting from 4th records, 4 records per page.{"_

MongoDB: Gathering Pipeline, It appears in MongoDB2.2. A data aggregation framework based on data processing pipeline conceptual modeling. The document enters a multi-stage pipeline that can convert the document into clustering results. The

Oracle primary key deletion, joint primary key creation, oracle primary key1. Delete the primary key alter table tablename drop PRIMARY_KEY execute the preceding SQL statement to delete the primary key; if it fails, use ALTER TABLE TABLENAME DROP

10.2.0.1.1 Start and Stop grid control, 10.2.0.1.1grid1. Stopping Grid Control and All Its Components1. stop OMS service [oracle @ ocm2 oms10g] $ cd/u01/app/oracle/OracleHomes/oms10g/bin/[oracle @ ocm2 bin] $. /emctl stop omsOracle Enterprise

When OGG is used, data is synchronized one way between two Oracle databases. Configuration: source database 100.100.100.21 Instance name dbsid2 Target database 100.100.100.41 Instance name db1 Tutorial objective: to synchronize the scott user emp

Assume that the two redis servers have ip addresses 192.168.1.101 and 192.168.1.103 respectively. How can I access redis on redis 101 through redis-cli on redis 103? Before remotely connecting to redis 103, let's talk about several key parameters of

Let's look at the database -- (3) triggers and database triggers.Concept: A trigger, as its name implies, is triggered by an event. For example, when we operate a table, it will be activated for execution. When talking about triggers, another key

Let you know software development in advance (35): How to modify SQL scripts to meet your needs ?, Software Development SQL Part 1 Database SQL language How can I modify an SQL script to meet my needs?   The SQL script modification process is the

SQOOP is an open-source tool mainly used for data transmission between Hadoop and traditional databases. The following is an excerpt from the SQOOP user manual. Sqoopis a tool designed to transfer data between Hadoop and relational databases. you

Create Jobs Syntax: Jobs are created using the DBMS_SCHEDULER package, which is the CREATE_JOB process. For example: SQL>BEGIN 2 DBMS_SCHEDULER.CREATE_JOB ( 3 job_name =>'Insert _ TEST_TBL', 4 job_type =>'Stored _ PROCEDURE', 5 job_action =>'P

Client installation is quite simple: you only need to pay attention to the following instructions. NOTE: If it is installed on the same server as the server, replace the Oracle symbol with the client, and change the installation path

In 10 Gb, Oracle launched its own auxiliary SQL optimization tool: SQL optimizer (SQL Tuning Advisor: STA), which is a new DBMS_SQLTUNE package. To use the STA, make sure that the optimizer is in CBO mode. However, I think this tool is only suitable

In the previous lesson, we talked about how to build a Hadoop environment on a machine. We only configured one NHName Node, which contains all of our Hadoop stuff, including Name Node, secondary Name Node, Job Tracker, and Task Tracker. This section

The 'Log file sync' wait event in the RAC database is more complex than the 'Log file sync' wait event in the Standalone Database, mainly because the RAC database needs to synchronize the SCN to all instances. The 'Log file sync' wait event in the

GridFS is a mechanism for storing large binary files in MongoDB. There are several reasons for saving files with GridFS: Grid can simplify requirements. If you have used MongoDB, GridFS does not need to use an independent file storage

Many Oracle database developers prefer PL/SQL functions, storage, and so on to simplify the code. Recommended reading: Use PL/SQL to execute java storage to obtain the MAC address For example: Select empno, ENAME, DNAME, loc from emp, dept where emp.

Version: 2.2.0 The following content relates to the previous article . In the previous article , we failed to move chunk. the investigation of the problem refers to the variable vector _ slaves. This variable only performs the clear operation when

In this five-minute tutorial, we will teach you how to quickly get started with MongoDB in a Windows environment. This article describes how to connect to the MongoDB server and how to use the MongoDB shell. First, you need to download the 64-bit

1. The downloaded Oracle SQL Developer, rpm file,: http://www.oracle.com/technology/software/products/ SQL /index.html 2. Install sun's jdk1.6. If it is already installed, skip this step. (linux mint 12 is installed by default.) command:Sudo

SQL> select * from v $ version; BANNER--------------------------------------------------------------------------------Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-64bit ProductionPL/SQL Release 11.2.0.1.0-ProductionCORE 11.2.0.1.0