pga mastercard

slowly come.Memory structure, the memory structure mainly includes the PGA and SGA,PGA is for the client Access Time service, the SGA is the database operation service, these after the machine power down disappeared.There are also the main 6 process PMON,SMON,DBWR,LGWR,CHPT,ARCN, which are only available when the database is started.The bottom is stored in the persistent media files, have archived logs, da

to mention the book appeared, there are many masters of the speeches. But we do not care about those, according to our own rhythm to write down characteristics, remember the wonderful. First insert the first picture of this series, figure one (absolutely from the official website), see how careful Toad for the picture use, if everyone has their own unique understanding of this figure, then you can skip this note directly, of course, it is also possible to know the new shame, and then Yong ....

Each time you modify these blocks in cachebuffer, you must first generate the corresponding changevector in PGA, and then the serverprocess from PGAcopy to SGAREDOLOG Each time you modify these blocks in the cache buffer, you must first generate the corresponding change vector in the PGA, and then copy the data from the server process to the SGA REDO LOG The redo log file is composed of redo records (als

statements. The data dictinary cache holds the most recently used database dictionary information. The data ditinary CacheIs also known as the row cache because it holds data as rows instead of buffers (which hold entire blocks of data ). Program global area:The program global area (PGA) is the area in the memory that contains the data and process information for one process, and this area is non-shared memory. The contents of the

AdvisorMemory: The physical zone loaded on the physical memory. One part is called SGA and the other part is called the original process. Key database files: Database Control Files, data files, and redoOther key datafiles: backup file, TRC file, spfile Shared Pool: parses SQL statements and stores SQL statements.Database Buffer: data block bufferJava pool: required by JVM. External stored procedure is called.Large pool: Backup RecoveryStream poll: Advanced Replication (available in Oracle 10)Pg

1. directpath reads description In versions earlier than Oracle 11g, if a full table scan is performed on a large table, the wait event is: DB file scattered read; in 11g, if a full table scan is performed on a large table, wait event is: direct path read; that is, in 11 GB, full table scan of large tables directly reads data blocks into the PGA region of the session. (For more information, see the following example ). In 11g, data blocks are directl

Bkjia.com exclusive Translation]Oracle has made great efforts in simplifying memory management over the past few years. Since Oracle 9i implements automatic PGA management through the PGA_AGGREGATE_TARGET parameter, Oracle 10g implements automatic SGA management through the SGA_TARGET parameter, oracle 11g is surprisingly capable of fully automatic management of all the memory blocks of the database. It makes dynamic management of SGA and

| | | | --------------------------------------------------------------------------------------------------------------- --predicate information (identified by Operation ID):---------------------------------------------------4-acce SS ("T3".) ID "=" T4 "." t3_id ") filter("T3".) ID "=" T4 "." t3_id ") 5-filter (" T3 "). N "=1100) From the result of the return execution plan, we can see:1. T3 as the driving table and T4 as the driving table, both cost (a-time) and buffers are almo

Term definitionsActive Session Pool resource group or sub-plan number of currently active sessions allowedADDM Automatic Database Diagnostic Monitor (automatic DB diagnostic monitoringProgramASM Automatic Storage Management (Automatic storage Management)ASM Automatic Summary Management (Automatic profile Management)ASMM Automatic Shared Memory Management (automatic management of sharing RAM)ASSM Automatic Segment Space Management (automatic segment space management)ATO Automatic Tuning Optimizer

reverse is true: only one instance of a database operates on it. However, Oracle's real application cluster (real application Clusters,rac) is an exception, This is an option provided by Oracle that allows operations on multiple computers in a clustered environment so that multiple instances can mount and open a database (on a shared set of physical disks) at the same time. As a result, we can access this database from several different computers at the same time. Oracle RAC supports highly ava

):---------------------------------------------------4-access (" T3 "." ID "=" T4 "." t3_id ") filter (" T3 "." ID "=" T4 "." t3_id ") 5-filter (" T3 ")." N "=1100)From the results of the returned execution plan we can see:1. The cost (a-time) and buffers of the T3 are the same as the driver table and the T4 as the driver table.2. With T3 as the driver table, T3 Access once, T4 is also visited once; With T4 as the driver table, T4 Access once, T3 is also visited once3. Sorting required if the

secondary database under the/u01 file system, as well as the data pump files2. There must be a full database backup, or at least system-related tablespace backupThe following are the restrictions and constraints for applying table or partition recovery in Rman:1. sys user table or partition cannot be restored2. Tables and partitions stored in the Sysaux and system tablespace cannot be restored3. Restoring this table is not feasible when the remap option is used to restore a table containing a N

consists of an Oracle instance and an Oracle database. That is: Oracle Server = Oracle Instance + Oracle Database Oracle Instances Includes a memory structure (SGA) and a series of background processes (Background process), which together are called an Oracle instance That is: Oracle Instance = SGA + Background Process Oracle Memory Architecture Includes system global Area (SGA) and program Global (PGA) Oracle Memory structures = SGA +

SQL Server cannot create table as select directlyTo copy a table under SQL Server, think of Oracle under direct CREATE TABLE XXX as SELECT * from .... Can.But the result is wrong, Baidu found.SQL Server syntax is: SELECT * into Tablenew from TableoldInsert into select and CREATE table as performance test and create TABLE 2013-10-05 09:55:00Category: Linux1.Document DescriptionThe INSERT into Select and CREATE table as statements are often used in the work to copy the form data, and when the data

. Configure IP addresses for different instances, associated access protocols, ports, and more. 3. The accessibility of an instance requires that the corresponding service for the instance be started. Notice here that the instance name and the instance's service name are not the same. The default instance's service name is MSSQLSERVER, and the named instance's service name is Mssql$instance_name. 4. The settings for the relevant functionality of the instance can be implemented through the peri

backup, or at least system-related tablespace backupsThe following are the restrictions and constraints for applying table or partition recovery in Rman:sys user table or partition cannot be restored• Tables and partitions stored in the Sysaux and system tablespace cannot be recovered• Restoring this table is not feasible when the remap option is used to restore a table that contains a NOT NULL constraint　10. Limit the size of the PGAPrior to Oracle 12c R1, there was no option to limit and cont

Tags: buffer file adjustment Automatic Management CAL business related user ICA--Memory allocationWhen you build a library, you can allocate system memory 50%-80% to Oracle and later adjust to your business.SGA, PGA distribution ratio:Oltp:sga%80, PGA%20Olap:sga%50, PGA%50Mixed: SGA%60, PGA%40 --SGA Automatic Managemen

system global zone (SGA) and program global zone (PGA) Oracle memory structures = SGA + PGA SGA is shared by servers and background processes. PGA contains the data and control information of a single server process or a single background process. Unlike the SGA shared by several processes, PGA is In a region used by

Generally, we will use the memory of the Oracle instance to 80%-60% of the physical memory of the system (4G memory or above uses more than 80%, 2g memory uses 60%-70%)S = pga + sga_max_size = 80% memory)Db_cache_size = 60% sgaShared_pool_size = sga_max_size-db_cache_size-160m can also be set to around 35% sgaJava_pool_size = 64 mLarge_pool_size = 16 mLog_buffer = 2 m 1: 4 GB physical memory If it is 4000 mThenS = 3200 mFor OLTP (Sga = s * 80% = 2560

After passing the previous authentication, you can call the open APIs in the API. Generally, the applications we develop need to display Weibo information of some enterprises. For example, the MasterCard I developed previously showed MasterCard Weibo. First, we need to call an interface: callbackNow Sina has changed to interfaces with S, but it still does not feel that S is easy to use. Many examples on the