A new lunar mineral has been discovered for the first time in China: a columnar crystal, named Chang'e stone.

CTOnews.com September 9 news, according to CNNC official WeChat, September 9, coincides with the Chinese traditional festival on the eve of the Mid-Autumn Festival, the National Space Administration and the State Atomic Energy Agency jointly released in Beijing Chang'e 5 lunar sample research results: CNNC Beijing Geological Research Institute of Nuclear Industry

2023-11-24 IT Information 我要分享

How to make pentagram cylindrical ribbon with C4D and the effect method of making ribbon of various shapes

C4D is a powerful and easy-to-use graphics and image software, simple but not simple software page, fully functional sparrow although the five organs are complete. Next, the editor will simply introduce to you how C4D makes pentagram-shaped ribbons. Steps to make a pentagram ribbon: 1. Open the C4D software

2022-05-31 Computer Software News 我要分享

Oracle 11G table compression

Recently, the alarm of a set of production database table space has been more than 90%, but the disk hardware resources are insufficient, and the whole library has reached 26T. The database has stored nearly 4 years of data, communicate with the business that the historical data basically can not do the operation, but can not be archived, so I thought of compressing the table to save table space. With

2022-06-01 Database 我要分享

How to realize Table Compression in Database

This article is about how to achieve table compression in the database. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look. Alter table table_name COMPRESS;-no matter how old

2022-05-31 Database 我要分享

How Mapreduce RCFile writes and reads API

This article mainly introduces Mapreduce RCFile how to write and read API, the article is very detailed, has a certain reference value, interested friends must read it! RCFile is a row and row storage with high compression ratio and efficient reading developed by FaceBook.

2022-05-31 Servers 我要分享

What are the five mainstream database models?

Today, the editor will take you to understand what the five mainstream database models are. The knowledge points in the article are introduced in great detail. Friends who feel helpful can browse the content of the article with the editor, hoping to help more friends who want to solve this problem find the answer to the problem. Let's study deeply with the editor. "

2022-05-31 Servers 我要分享

Spark SQL Note arrangement (1): an introduction to the overall background of Spark SQL

[TOC] basic Overview 1. After Spark version 1.0, Spark officially launched Spark SQL. In fact, the first to use is Hadoop's own Hive query engine; for example, MR2, our underlying layer is the running MR2 model, and the underlying layer is based on

2022-06-03 Internet Technology 我要分享

Summary of 12C new feature _ In-Memory column storage

Official document https://docs.oracle.com/en/database/oracle/oracle-database/12.2/inmem/concepts-for-the-im-column

2022-06-01 Database 我要分享

Introduction and simple use of Parquet

= = > what is parquetParquet is a file type of column storage = > official website description: Apache Parquet is a columnar storage format available to

2022-06-03 Internet Technology 我要分享

How to understand Oracle table compression

This article introduces the relevant knowledge of "how to understand Oracle table compression". In the operation of actual cases, many people will encounter such a dilemma. Next, let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something! 1. Official documents

2022-05-31 Database 我要分享

What is the compression of Oracle table?

This article shows you what the compression of the Oracle table is like, the content is concise and easy to understand, it can definitely brighten your eyes. I hope you can get something through the detailed introduction of this article. As the database grows, we can consider using oracle's table compression technology. Gauge pressure

2022-05-31 Database 我要分享

What is the RCFile of Hive-based file format and its application

This article introduces you based on Hive file format RCFile and its application is how, the content is very detailed, interested friends can refer to, hope to be helpful to you. As an open source implementation of MR, Hadoop has been running the parsing file format dynamically.

2022-06-01 Servers 我要分享

Align JOIN field types and use arrays instead of strings to reduce string processing overhead and column storage to reduce scanning overhead

Background Greenplum is usually used as OLAP. In the process of some users, poor performance may be caused by data structure design, SQL problems and other reasons. Although the problem can be solved by adding nodes, it can save a lot of hardware resources if it can be optimized. For example, 1. Alignment

2022-06-01 Database 我要分享

How to customize the histogram of a graph by Qt

This article mainly explains the "Qt how to customize the graph bar chart", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in depth, together to study and learn "Qt how to customize the curve bar chart" bar! Functional features can be set up the X axis and the Y axis

2022-06-01 Internet Technology 我要分享

Spark SQL Note arrangement (2): DataFrame programming Model and Operation case

[TOC] principle and Analysis of DataFrame Spark SQL and DataFrame1, Spark SQL is a module in Spark, which is mainly used for structured data processing. The core programming abstraction it provides is DataFram

2022-06-03 Internet Technology 我要分享

What are the commonly used compression algorithms for databases?

Database commonly used compression algorithms, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something. The compression algorithm commonly used in database how to interpret the earliest column database Sy

2022-05-31 Database 我要分享

How to use CREATE TABLESPACE in database

This article is about how to use CREATE TABLESPACE in the database. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look. 1. Official BOOK → SQL Language R

2022-05-31 Database 我要分享

Changes in Oracle Database 12cR2/R1

Changes in This Release for Oracle Database Administrator's GuideThere are changes in this document

2022-06-01 Database 我要分享

Let's walk into the big data open source project-Section 1

Recently, the hottest news in big data's field is that Pivotal fulfilled its promise to open source its big data core product GemFire,HAWQ,Greemplum DB at the beginning of the year. This news also made Pivotal very popular in the domestic technology community.

2022-06-03 Internet Technology 我要分享

Oracle memory Architecture (2)

System Global Area (SGA) Overview SGA is a read-write memory region that, together with the oracle database background process, forms an oracle database instance. Server processes corresponding to all user processes can read information in SGA. one

2022-06-01 Database 我要分享