ADF against the REST business components to access data

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  Oracle Oracle 465 11u REG 8.18 6291464192 /ora2/oradata/essepr3/recprov_tb_01.dbf 48496658
  Oracle Oracle 465 13u REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659
  Oracle Oracle 465 15u REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659
  Oracle Oracle 964 11u REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659
  Oracle Oracle 964 13u REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659
  Oracle Oracle 964 14u REG 8.18 6291464192 /ora2/oradata/essepr3/recprov_tb_01.dbf 48496658
  Oracle Oracle 13364 14u REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659
  Oracle Oracle 13364 76u REG 8.18 6291464192 /ora2/oradata/essepr3/recprov_tb_01.dbf 48496658
  Oracle Oracle 16445 17u REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659
  Oracle Oracle 16445 18u REG 8.18 6291464192 /ora2/oradata/essepr3/recprov_tb_01.dbf 48496658
  Oracle Oracle 20522 REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659 82uW
  Oracle Oracle 20522 REG 8.18 6291464192 /ora2/oradata/essepr3/recprov_tb_01.dbf 48496658 122uW
  Oracle Oracle 20532 44u REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659
  Oracle Oracle 20532 75u REG 8.18 6291464192 /ora2/oradata/essepr3/recprov_tb_01.dbf 48496658
  Oracle Oracle 20534 17u REG 8.18 4823457792 /ora2/oradata/essepr3/recprov_tb_02.dbf 48496659
  Oracle Oracle 20534 79u REG 8.18 6291464192 /ora2/oradata/essepr3/recprov_tb_01.dbf 48496658
  
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  [root@ymir ~] # ps - ef
  ...
  Oracle 465 1 Jan27 0? 00:00:23 oracleessepr3 (LOCAL = NO)
  Oracle 964 1 Jan27 0? 00:00:25 oracleessepr3 (LOCAL = NO)
  Oracle 13364 1 0 Jan13? 02:45:02 oracleessepr3 (LOCAL = NO)
  Oracle 16445 1 0 Jan21? 00:00:05 oracleessepr3 (LOCAL = NO)
  20522 1 0 2009 Oracle? 00:09:59 ora_dbw0_essepr3
  20532 1 0 2009 Oracle? 00:04:24 ora_ckpt_essepr3
  20534 1 0 2009 Oracle? 00:04:10 ora_smon_essepr3
  ...
  
  And I confirmed this information from the data base repository:
  
  SQL > select p.SPID, SSE. TYPE, SSE. Username, SSE. MACHINE, SSE. PROGRAM
  session $ v ESS, v$ process p
  where p.SPID (465, 964, 13364, 16445, 20522, 20532, 20534) and SES. PADDR = p.ADDR;
  
  USER NAME OF TYPE SPID MACHINE PROGRAM
  ----- ----------- --------------- --------------- ---------------------------------------------------------
  20522 BACKGROUND dbserver (DBW0) oracle@dbserver
  20532 BACKGROUND dbserver oracle@dbserver (CKPT)
  20534 BACKGROUND dbserver oracle@dbserver (SMON)
  13364 USER DBSNMP dbserver emagent@dbserver (TNS V1 - V3)
  964 RECPROV USER appserver JDBC Thin Client
  16445 USER SYSTEM userPC PlSqlDev.exe
  465 RECPROV USER appserver JDBC Thin Client
  
  * RECPROV is the name of the user of the application database.
  
  My question is, why are there user processes to access data files? I think that it does not match the process architecture defined by Oracle. And most importantly, it does not mean a security leak in the database?
  
  DB version: 10.2.0.3, dedicated
  The Linux Version: Linux 2.6.18 - 53.el5xen #1 SMP Sat Nov 10 19:46:06 EDT 2007 x86_64 x86_64 x86_64 GNU/Linux
  
  Thanks in advance

  Hello

  There seems to be some confusion, even in the Oracle documentation, in terms of nomenclature.

  Think of it this way. There is the client program that connects to Oracle, such as SQL * Plus, Toad, custom, etc. written application. This program runs on the client. This may or may not be on the database server.

  Then there's the Oracle database server process. They run always on the database server. These processes are of two types, the USER and the background.

  You can see:

  SQL> select background,count(*) from v$process group by background;
  
  B   COUNT(*)
  - ----------
            65
  1         37
  

  Here are copies of the file binary oracle attach directly to the SGA and interact with database files. The binary oracle works with several different "personalities" based on the different purposes, he is currently serving. The type of background process, are divided into different specific methods for specific purposes.
  Yet once, observe:

  SQL> select pname from v$process where background = 1;
  
  PNAME
  -----
  PMON
  VKTM
  GEN0
  DIAG
  DBRM
  PING
  PSP0
  ACMS
  DIA0
  LMON
  LMD0
  
  PNAME
  -----
  LMS0
  LMS1
  RMS0
  LMHB
  MMAN
  DBW0
  DBW1
  LGWR
  CKPT
  SMON
  RECO
  
  PNAME
  -----
  RBAL
  ASMB
  MMON
  MMNL
  MARK
  LCK0
  RSMN
  GTX0
  SMCO
  W000
  RCBG
  
  PNAME
  -----
  QMNC
  Q001
  CJQ0
  Q005
  
  37 rows selected.
  

  Thus, each background process serves a different purpose. For example. DBW0 concerns only to write data from the buffer cache data files and maintaining all data structures associated with it. Each background process above serves a different purpose, I will not go into all. Generally, the background processes start up time of instance startup, even though some may be started on demand, at a certain time after the start of the proceeding.

  Now, consider a dedicated server model. When you connect to the database by using SQL * Plus, for example, you run the binary "sqlplus". Assume that you are connected via SQL * Net. In this case, sqlplus connects to the listener, the listener creates an oracle server process, type 'USER '. This process always runs on the database server. It runs under the user 'oracle', and it provides your real and direct interface to the database. This user can interact with the database and read the database files directly.

  Mainly, your server processes the USER will read the data from the cache buffers and, in the case of an absence of cache, will read the data in the data files and loading into the buffer cache. In addition, according to the code path, it can directly read or write to the datafiles, bypassing the buffer cache.

  So, the bottom line, all server (USER and BOTTOM) processes, interact with the database and associated files. The code of client program (sqlplus, Toad, etc.) NEVER directly interacts with the database.

  Hope that things cleared up.

  -Mark

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  (4) No.
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  Published by: adf009 on 12/03/2013 12:09
  
  Published by: adf009 on 03/20/2013 14:44

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