pga purse

Tags: Oracle architecture PGA SGAWriting an article is mainly inspired by two books to write some personal notes, share knowledge, and recommend books to everyone read 1, "Harvest, not only Oracle" 2, "Oracle Kernel technology" does not involve programming, design architecture ideas, if there is a programming book is better! There are official documents must read, the English level is poor reading translation also must read again, the real authority o

Tags: DBA RAM read-write management art SSE buffer temp tablespace UNIXReprinted from: http://blog.csdn.net/robinson_0612/article/details/5529239 An Oracle server consists of an Oracle instance and an Oracle database. That is: Oracle Server = Oracle Instance + Oracle Database One, Oracle instance Oracle instances include a memory structure (SGA) and a series of background processes (Background process), which together are called an Oracle instance: Oracle Instance = SGA + Background Pro Cess Or

Redo is generated in PGA, and then the server process of each session copies the redo record to the logbuffer of SGA, and then the LGWR process refreshes the redolog file. Redo logs are generated in PGA, and then the server processes of each session copy the redo records to the log buffer of SGA, and then the LGWR process refreshes the redo log files. Redo logs are generated in

RMAN goes deep into parsing-RMANRMAN In the Memory creates some buffers in the memory, and then writes data blocks to the backup through these buffers. Memory utilization is related to the overall size of PGA (sometimes SGA. Memory Buffer RMAN goes deep into parsing-RMANRMAN In the Memory creates some buffers in the memory, and then writes data blocks to the backup through these buffers. Memory utilization is related to the overall size of

Oracle memory structure Oracle's three main memory structures: System Global Area (SGA): This is a large shared memory segment, almost all Oracle processes need to access the process Global Area (PGA) in this region: this is a process or thread-specific memory, and other processes/Threads cannot access it. Www.2cto.com User Global Area (UGA): This Area is associated with a specific session. It may be allocated in SGA or

Shared SQL zone, private SQL zone, and cursor I. Share the SQL ZoneThe shared SQL zone is another way of calling the handle of the cursor object in the Library cace and the data of the Child heap.Ii. Concept of private SQL ZonePrivate SQL zone, which is stored in PGA in dedicated server mode.(Review the concept of PGA:PGA is allocated on the server side and records information about processes connected to the Oracle server, such as the username and p

trying to allocate 44 bytes (KXS-heap-D, Allocator state)ORA-12012: Error on auto execute of Job 1ORA-04030: Out of process memory when trying to allocate 8148 bytes (KXS-heap-W, qesaqbinit: buffer) Wed Jul 13 14:59:26 2011Errors in file E: \ oracle \ product \ 10.2.0 \ admin \ sxserver \ bdump \ sxserver_j000_876.trc:ORA-12012: Automatic Execution of Job 1 errorORA-04030: insufficient process memory when trying to allocate 16428 bytes (PGA heap, kgh

Tags: performance testing-Used in performance optimization.--View the memory allocated for the database.SELECT * from V$SGA;SELECT * from V$sgastat;--xshell, see how much CPU is allocated for the database.[Email protected] ~]# su-oracle[Email protected] ~]$ sqlplus zy_12c/[email PROTECTED]:1521/ORCLSql> Show Parameters CPU--1, viewing the maximum number of cursors for OracleSql> Show parameter open_cursors;--2, viewing the number of currently open cursorsSql> Select COUNT (*) from V$open_cursor;

executes the SQL statement. For example, when updating data, the SQL statements executed by the user do not make changes directly to the data file on disk, but rather first copy the data file to the database buffer cache (that is, the database buffer holds a copy of the SQL-related data file), and then change the copies of those blocks that are applied to the database buffer cache. And the copy of The block will remain in the cache for a period of time until the buffer it occupies is overwrit

Oracle Memory ArchitectureThe basic memory structures associated with Oracle instances include:System global Area (SGA): shared by all servers and background processes. Examples of data stored in the SGA include cached data blocks and shared SQL regions.Program Global Zone (PGA): Individual server processes and background processes are dedicated, each process has a PGA.The SGA is a shared memory area that contains data and control information for the

, and the default value is related to the Oracle version5) mode? Mode is a collection of database objects. Include: tables, views, indexes, synonyms, sequences, procedures, packages, and so on.? When a user is created, Oracle automatically creates a pattern that is the same as the user name, so the pattern is also known as user mode.When a user logs on, the default access is the number library object in the same mode as their own name.Third, Oracle's memory structureMemory is the first element t

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 available systems that can be used to build a solution that is very scalable.An instance is the name of the memory structure that governs the associated library (the SGA,

Oracle's memory configuration is tied to Oracle performance. In general, it can be divided into two chunks: the shared portion (mainly the SGA) and the process-exclusive portion (mainly the PGA). In Oracle versions under 32-bit operating systems, it is very frustrating to have project feedback on memory errors (such as ORA-04030, 04031 errors) from time to times. Consult the data to understand that the ORA-04030 problem is generally caused by the

information of database (database name, path of control file, log buffer size, etc.). 1) View server parameters View by View: Col name for A30; Col value for A30; Select name,value,ismodified from V$parameter; View via show parameter . 2) Modify Server parameters Implemented through the Enterprise Manager (OEM) or the alter system command. 2.2.5password files, warning files, and trace files2.3oracle11gServer Structure Oracle servers consist primarily of instances, databases, program global zo

NOI2016 Roll Rough Kee2016-07-28On the train home, write down this travels to commemorate my first Noi.Feel everything is too fast, feel yesterday came to Noi, only came to Mianyang Nanshan Middle School, and today has to go back, the first time Noi so ended.Day-1Do not want to review the board, open the computer began a variety of decadent, played a while and do not want to play, so began to decadent (South Bird really good Meng ^w^), feel to end the rhythm, night also can't sleep, full of conf

synchronizing the blockchain, only sync with their own wallet-related, so synchronization speed faster.But it still has to be synchronized. Neo Official useful TS implementation of a version, the code is more complex.The project has been abandoned by the authorities, and the model is Nel not to provide support.Light purse front and rear table modeFirst, many enthusiasts involved in the development of Dapp basically underestimated the difficulty of de

Blockchain Enthusiast (qq:53016353) De-centering (decentralized) The centrality is relative to the centrality. Here, there is no centralized bank to provide storage, trading and other functions. Instead, each node connected to the network provides the functionality described above. In the bitcoin system, each node connected to the network stores a copy of the General ledger, which is why it is synchronized when using the wallet. And who will verify the validity of the transaction? By the mining

, a single process in Oracle can use PGA to reach pga_aggregate_target * 5% = 50 m, this causes an error during hash join.ORA-04030: Out of process memory when trying to allocate 254476 bytes (hash-join Subh, kllcqas: kllslibs)If we reduce pga_aggregate_target to MB, the query is executed successfully. Because vlm is not used, the memory allocation space of a single process must be less than 3 GB, and PGA a

1. pga_aggregate_target Starting from Oracle9i, Oracle introduced the new feature of automatic PGA management. The PGA_AGGREGATE_TARGET parameter is used to control the overall expected goal of PGA, but in Oracle9i, the PGA_AGGREGATE_TARGET parameter is valid only for Dedicated connections of the Dedicated Server in Dedicated Server mode and invalid for Shared Server connections; PGA_AGGREGATE_TARGET takes

Vertex, cursor_space_for_time, gets, pin saw a post on asktom last weekend, some people mentioned the effect of session_cached_cursors and cursor_space_for_time on library cache gets pin, the Post url is http://asktom.oracle.com/pls/ask/f? P = 4950: 8 ::::: F4950_P8_DISPLAYID: 465420331879 here, tom also showed us that session_cached_cursors and cursor_space_for_time have different effects on gets pin of library cache in 9i and 10g. Let's take a look at session_cached_cursors, cursor_space_for