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Tags: CLI shared pool Global and Otto table structure show introductionBasic points of knowledgeBasic memory structure: Sga+pga+uga+software code area (software region)Learn about the components of SGA memory and some common featuresLearn about Oracle 11G automatic memory management capabilitiesSpecific introductionAn Oracle DB instance is composed of some columns of the system global zone and the background process.The way a client accesses a databas

default shader compiles all renderers#pragma multi_compile names--------------------------------for multiple materialsEach fragment must contain at least one vertex program and one fragment program. So # pragma vertices and # pragma fragment directives are required.Shader Targetby default, Unity compiles shaders into approximately equal to 2.0 material models #pragma target 2.0 (default)---- Shading Model 2.0 Direct3D 9--- ----limited arithmetic and material descriptions, no vertex texture samp

and listens to accept the TCP connection from the client, and obtain the TNS data packets sent from the client. (2) The listening process opens the pipeline for communicating with the sub-process, and fork a sub-process, called "Listening to sub-process 1", and then the listening process keeps waiting, until the "listening sub-process 1" ends. (3) Listen to sub-process 1 Fork out of sub-process 2. (4) After completing the preceding step, child process 1 immediately exits and ends child process

(PGA) A pga is an exclusive memory area. The Oracle process uses it to store data and control information in a proprietary manner. When the Oracle process starts, the PGA is created by the Oracle database. User global zone (UGA) UGA memory allocation is related to user sessions. Software code area Part of the memory in this area, which is used to store

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-managed parameter Memory_target in Oracle 11g,It automatically adjusts the SGA and PGA, which requires the/DEV/SHM shared file system to be used.and requirements/DEV/SHM must be greater than memory_target, if/DEV/SHM than Memory_target small will errorSolution Solutions1. Initialization parameters Memory_target or Memory_max_target cannot be greater than shared memory (/DEV/SHM), in order to resolve this problem, you can increase the/DEV/SHMSuch as:#

Take a look at what information this view can bring to us (each column in the view is helpful):[Email protected]> Select pga_target_for_estimate/1024/1024 "PGA (MB)",2 Pga_target_factor,3 Estd_pga_cache_hit_percentage,4 Estd_overalloc_count5 from V$pga_target_advice;PGA (MB) pga_target_factor estd_pga_cache_hit_percentage Estd_overalloc_count---------- ----------------- ----------------------------- -------

, etc.In the PGA space also includes a very important space area, called: UGA (User Global Zone), session information, sorting information, etc. are stored in the UGA space.PGA Memory: When connected to a user process, the PGA is allocated when the session ends and the PGA is releasedPGA Size: 10M to 4gb-1bytePGA Management method: Workarea_size_policy parameter

space in the/u01 file system to store the auxiliary database and data pump files. 2) full database backup must exist, or at least SYSTEM-related tablespaces exist. The following restrictions apply to RMAN recovery tables or partitions: 1) SYS user tables or partitions cannot be restored. 2) tables or partitions stored in the SYSAUX and SYSTEM tablespaces cannot be recovered. 3) You cannot use the REMAP option to restore a table that contains the not null constraint. 10. Maximum

Use Oracle internal principles to describe the following procedures: 1, Sqlplus USER/PASSWD@ORCL 2, update t set a=1 where b= ' SS '; 3, commit; 4, exit 1, Sqlplus USER/PASSWD@ORCL (1), Client Sqlplus connection monitoring (2), listening to receive connection requests, fork an Oracle process, as a server process, while allocating a small piece of PGA memory. (3), the server process and the client establish a connection. (4), server process (hereinaft

creation time. If you use the Order BY sorting statement to specify the Order BY employee number, all records generated after sorting are temporary data. How does the Oracle database process the temporary data? Generally, the Oracle database first stores the temporary data in the PGA (Program global zone) of the memory. In the global area of this program, there is a place called the sorting area, which is used to store the temporary data generated by

There are three ultimate propositions in Philosophy: Who are you? From where? Where to go? For the dapm mechanism, we can ask: What is dapm and what is its function? How is dapm created? How is dapm triggered? The following is an analysis of these three problems. First, what is dapm? This is mentioned in the overview of dapm, that is, the dynamic management of audio power supply. I believe that power management is not unfamiliar to everyone. The purpose of the dapm design is to enable the necess

The Oracle database server consists of databases and instances. Instance Memory Structure of the instance: SGA (system global areas) and PGA (Program global areas ).The process structure of the instance: service process and background process. Memory Structure: SGA (system global areas) 1. database cache db_cach_size. Keep cache pool buffer_pool_keep. Recycle cache pool buffer_pool_recycle. Default cache pool db_cache_size-(buffer_pool_keey + buffer_p

backup must exist. The following are restrictions and constraints on applying table or partition recovery in RMAN: SYS User table or partition cannot be recovered Tables and partitions stored in the SYSAUX and SYSTEM tablespaces cannot be recovered. When the REMAP option is used to restore a table that contains the not null constraint, it is NOT feasible to restore the table. 5. Limit the PGA size Before Oracle 12c R1, there is no opt

> alter system set SGA_TARGET=632M Scope=spfile;System altered.3 Restart DB3.1 sys> Startup forceOra-00838:specified value of Memory_target is too small, needs to being at least 644MSys> Show parameter PGA;Ora-01034:oracle Not availableProcess id:0Session id:54 Serial Number:53.2 Based on information such as error reporting. You can see that the SGA settings are large.Led to the PGA small, so error. Memory

When sorting, grouping and summarizing, and indexing are performed in the Oracle database, a lot of temporary data is generated. If there is an employee information table, the database stores the installation record creation time. When sorting, grouping and summarizing, and indexing are performed in the Oracle database, a lot of temporary data is generated. If there is an employee information table, the database stores the installation record creation time. If you use the Order BY sorting state

. (4) After completing the preceding step, child process 1 immediately exits and ends child process 1. (5) sub-process 2 collects the host name, IP address, and process Number of the process, the sub-process 2 is renamed as the server process (here we also call the server process as the frontend process or server process), and the application occupies a small piece of PGA memory. (6) The foreground process sends the host name, IP address, and pr

The new feature of ORACLE11G's automatic memory management (Automatic Memory Management) is another important enhancement of Oracle's memory management. If this parameter is set too high, the following error prompts may appear when the instance is started: SQL*Plus: Release 11.1.0.5.0 - Beta on Sun Jul 29 08:35:28 2007 Copyright (c) 1982, 2007, Oracle. All rights reserved. Connected to an idle instance. SQL> startup ORA-00845: MEMORY_TARGET not supported on this system This tip does not mean t

Tags: Oracle memory managementThe 6th chapter of Administrator's Guide describes the memory management of Oracle instances, where Oracle uses automatic memory management (AMM) to manage the size of the SGA and PGA by default in 11g. In addition to the default methods, you can use the automatic shared memory management SGA (ASMM), manual shared memory management SGA, automatic PGA Memory management, and manu

the backup and recovery capability of the database, the modified information is archived to archived Log files before overwriting. Password File : Stores the password when connecting to the backend database system with the client. The following shows the database portion of Oracle installed on Linux. The large stack of files shown below is Oracle database (typically located under the directory of the instance name under the database installation path). *.TCL Control files *.dbf