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Tags: Create here bind DNA Type host redo log line number1. Understand Oracle tablespace and data files. Oracle storage model. Table spaces, segments, intervals, Oracle blocks, data files, and the corresponding relationships of operating system blocks. Select Segment _type, COUNT (1) from Dba_segments Group by Segent_type. View type. Table Heap Tables Index index
Oracle Architecture Database (software + hardware) instance: Memory (Sga,pga,uga) + process (background process, service process). Physical Structure: Data File/control file/log file. Logical Structure: table Space > Logical Objects (table, view, index, trigger, store D-index segment, temporary segment, rollback segment) > interval (minimum
, backup and recovery activities, and Shared Server Components Streams pool: cache queue request information related to the database. When the oracle Advanced queue option is enabled SGA uses algorithms to manage memory at least. 2) background process There are many background processes, each of which executes a special task to help manage oracle instances. Five
Tags: file creation customer background control software data store write ACLOracle ArchitectureOracle architecture is mainly used to analyze the composition, working process and principle of the database, as well as the organization and management mechanism of the data in the database.Oracle DatabaseThe Oracle database
: used to store all data (*. DBF). Each database has a set of data files, and only one data file can correspond to one database.LOG File: records all operations performed on the database (*. LOG). It is mainly used for database fault recovery.Control File: records the control information (*. CTL) of all database files
Author: Lu YangTo learn about oracle, we 'd better first understand the Oracle framework. In this way, we have an overall understanding of Oracle, and it has the role of creating a high-level architecture.1. Physical Structure (composed of control files, data files, redo log files, parameter files, archive files, and p
Architecture Diagram Learning: The story of Lao Yu's clothing store Structure diagram: SQL query Statements Sga Shared pool Data buffer Buffer Cache Pga Process SQL UPDATE statement Sga: Log buffers Log file Deep learning Submit Rolling back Consistent
points out that the speed in the parallel processor environment is subject to the serial part of the program, that is to say, it implies that multi-core performance may not be so good. For a DBAIntel's Nehalem CPU(The structure is shown on the right) The most noteworthy feature is the improvement in the NUMA (Non-Uniform Memory Access) architecture. The Oracle Databas
Tags: database Oracle library Server SystemJust debut, here hope you Daniel guidance, hope here to become a platform for my growth! This blog I tell you about Oracle's architecture, but also a test of their own learning!Oralce memory is composed of SGA+PGA.The Oracle server is comprised of
The Oracle information security management architecture focuses on Oracle's strategy to help users securely store and access information, including the following three layers: Ensure security at the application layer. The biggest challenge to application security is access control ". In the early days, separate application systems adopted fragmented security policies, such as too many usernames and passwo
overwritten, the archive process reads the log information of the log file that is about to be overwritten, and then writes these "read log messages" to the archive log file.When the system is busy, it may cause LGWR to wait for the arch process, you can modify the Log_archive_max_process parameter to start multiple archive processes, thereby increasing the speed of the archive write disk.System monitoring Process (Smon)A mandatory process to perform recovery work when the
Understanding of Oracle architecture ------- preliminary understanding First of all, the Oracle architecture has a system diagram, which I also understand. In fact, the architecture is the figure. To understand the architecture, y
Tags: Oracle architecture user ManagementDatabase architectureDefined:The composition of the database, the working process, the composition and management mechanism of the data in the database.Compositioninstances, user processes, server processes, database files,Other files (parameter files, password files, archive fi
The architecture of an Oracle Data warehouse can be divided into three tiers: Data acquisition Layer: Oracle database Enterprise ETL OPTION + Oracle database data Quality option in Oracle
checkpoints. A full checkpoint will trigger DBWn to write all the dirty data blocks in the buffer cache to the corresponding data file (even if the transaction is not committed) and synchronize the information in the data file header and control file, ensure Database Consistency. A full checkpoint occurs after 8 I only in the following two cases: Database shutdown (immediate, transcational, normal) DBA
, modify Oracle home as: D:\instantclient_12_1;Modify ocilibrary for, D:\instantclient_12_1/oci.dll;20.copy Oracle's core file TNSNames to a path without Chinese and white space, then added to the system environment variable, variable name: tns_admin, variable value: D:\instantclient_12_121. Enter the system using the systems account;22. After entering the database, reset and unlock the Scott account with t
To understand the Oracle architecture, you must first understand two basic concepts: databases and instances.One: DatabaseA database is a collection of data.Whether the database is in a relational or object-oriented structure, the Oracle
changes in the redo log buffer to the online redo log fileSystem monitoring: Check database consistency If necessary also initiates recovery of the database when the database is openedProcess monitoring: Responsible for cleaning up resources in the case of an Oracle process failureCheckpoint process: Updates the
all, hibernate can replace CMP in the EE architecture of the EJB application. The task of achieving data persistence.Hibernate has a total of 5 core interfaces: Session, sessionfactory, Transaction, query, and configuration. These 5 core interfaces will be used in any development. Through these interfaces, you can not only access persistent objects, but also enable transaction control. These five core interfaces are described separately below.· Sessi
This article focuses on website performance optimization from the perspective of [Server Load balancer, server architecture, and database expansion "and puts forward some performance optimization suggestions for the reference of netizens who need to build medium and large websites.1. Separation of Web server and DB ServerFor small websites or B/S projects, the same physical host can be used as both web serv
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