Database Administrator

Introduction to Oracle RAC clusters, processes, and logs In a single-host environment, Oracle runs on the OS Kernel. OS Kernel manages hardware devices and provides hardware access interfaces. Oracle does not directly operate the hardware, but has

MySQL Backup recovery based on LVM Snapshot Directory1. Full database backup2. Prepare LVM volumes3. Data Recovery to LVM volumes4. Back up data based on LVM snapshots5. Data Disaster Recovery6. Summary Preface:The mysql 5.5.36 database is installed

Quick Reference for installation and deployment of Oracle 11G Single Instance + ASM storage on Linux Operating Environment: Apply for a Linux6.4 host (Template) in the Citrix virtualization environment)Objective: to create a single-host 11 GB + ASM

Analysis of Jenkins proprietary user database encryption algorithm Jenkins access control includes security domain authentication and authorization policies. The security domain can be in three forms: Jenkins private user database, LDAP, and

Connect to the oracle (11g) database using python, python11gPreparation: 1. Download the corresponding version of oracle-instantclient (I am here 11.2.0.1.0) http://www.oracle.com/technetwork/database/features/instant-client/index-097480.html2.

Error code: 1248 Every derived table must have its own alias, 1248 derived 1. Error description 1 queries executed, 0 success, 1 errors, 0 warnings query: SELECT stu_id, (SELECT stu_name FROM t_student_info t WHERE t. stu_id = t. stu_id)

Describes the Lateral type in PostgreSQL, postgresqllateral PostgreSQL 9.3 uses a new union type! Lateral is relatively low-key, but it implements a powerful new query that can be obtained only by programming. in this article, I will introduce a

Linear table of DS, ds linear table Linear table definition A linear table is the most common and simple data structure. A linear table is a finite sequence of n data elements. The specific meaning of each data element varies under different

07-SQLite like, wildcard (%,-, [char list], [^ char list], [! Char list]), 07-sqlitecharI. Overview of like The like operator is used to search for the specified mode syntax in the where clause: select column_name (s) from table_name where column_

Database optimization tutorial (I) preface & definition of slow query, and introduction of database optimization tutorial Preface   Recently, I helped the company optimize the database. Based on what I learned, I used the learning knowledge step by

Database Tuning tutorial (2) Prepare slow query data and optimize Databases 1. Slow query found In the previous section, we talked about the definition of slow queries. This section describes how to create a large table and prepare data for slow

Computing middle layer of a report application, and computing middle layer of a report Application In traditional report applications, there are generally three ways to compute source data: 1. The report tool directly connects to the database to

Optimize update-virtual table and update-virtualBefore modification: A1update gls_voucher t set t. promptval = (select sum (m. originalval) from gls_vchitem m where m. vid = t. vid and m. dir = 1); B1update gls_voucher t set t. promptexplain =

SQL Application and Development: (4) view applications and SQL Application Development View A view is a table created based on a predefined query. Its definition exists as a schema object. Like a base table, a view contains a series of columns and

Simplifies complex set operations of report data sources and computation of reports Set operations are often used in computing report data sources. SQL supports set operations so that most simple set operations can be completed easily. However, when

Data segmentation-Atlas introduction and segmentation atlas Introduction Atlas is a MySQL-based Data Middle Layer project developed and maintained by the infrastructure team of Qihoo 360 Web platform department. Based on MySQL-Proxy 0.8.2 officially

Requirement and introduction of ACCESS Database booster, access Database 0. Requirements 0.1 questions about cs Encapsulation In this thesis, access database is used, and MVC design mode is used for design. data entities must be encapsulated into

MySQL installation (source code installation mode) and mysql source code installation mode MySQL installation (RPM installation mode) and directory structure MySQL installation (Binary installation mode) MySQL installation (source code installation

SQL removes duplicate records, SQL removes duplicates There are two Repeated Records. One is a completely repeated record, that is, records with all fields being repeated, and the other is records with duplicate key fields, such as duplicate Name

Starting from the database to prevent information leakage in the Social Security Industry In response to the massive leakage of Social Security user information in 30 provinces and cities nationwide reported by the Internet today, Anhua gold