Foreground of Oracle process to access data under Linux files

As far as I know, processes user in an Oracle database running the application code, but the processes of database running Oracle database server code (server process analyze and execute the SQL statements issued through the app, read data of data files blocks and return the results to the application.) Background treats the archive logs, update the headers of all the data files to save the details of the control point, written content of the buffers of data files, runs the recovery if necessary, etc.)

However, I could see the oracle user processes to access data files in my Oracle database. When I look for the processes to access data belonging to the tablespace files "recprov", I get the following:

[root@ymir ~] # lsof | grep recprov
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

As you can see, there are 7 oracle processes that access data files: 4 processes user and 3 background processes:

[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

Tags: Database

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    its best to be thorough than paying the high price later now too. Check with them to one
    extreme overkill point and then run the cleaning only when you are sure that the system is clean.

    It can be made repeatedly in Mode safe - F8 tap that you start, however, you must also run
    the regular windows when you can.

    Download malwarebytes and scan with it, run MRT and add Prevx to be sure that he is gone.
    (If Rootkits run UnHackMe)

    Download - SAVE - go to where you put it-right on - click RUN AS ADMIN

    Malwarebytes - free
    http://www.Malwarebytes.org/products/malwarebytes_free

    Run the malware removal tool from Microsoft

    Start - type in the search box-> find MRT top - right on - click RUN AS ADMIN.

    You should get this tool and its updates via Windows updates - if necessary, you can
    Download it here.

    Download - SAVE - go to where you put it-right on - click RUN AS ADMIN
    (Then run MRT as shown above.)

    Microsoft Malicious - 32-bit removal tool
    http://www.Microsoft.com/downloads/details.aspx?FamilyId=AD724AE0-E72D-4F54-9AB3-75B8EB148356&displaylang=en

    Microsoft Malicious removal tool - 64 bit
    http://www.Microsoft.com/downloads/details.aspx?FamilyId=585D2BDE-367F-495e-94E7-6349F4EFFC74&displaylang=en

    also install Prevx to be sure that it is all gone.

    Download - SAVE - go to where you put it-right on - click RUN AS ADMIN

    Prevx - Home - free - small, fast, exceptional CLOUD protection, working with others
    security programs. It is a single scanner, VERY EFFICIENT, if it finds something to come back
    here or use Google to see how to remove.
    http://www.prevx.com/   <-->
    http://info.prevx.com/downloadcsi.asp?prevx=Y  <-->

    Choice of PCmag editor - Prevx-
    http://www.PCMag.com/Article2/0, 2817,2346862,00.asp

    Try the demo version of Hitman Pro:

    Hitman Pro is a second scanner reviews, designed to save your computer from malicious software
    (viruses, Trojans, rootkits, etc.). who infected your computer despite safe
    what you have done (such as antivirus, firewall, etc.).
    http://www.SurfRight.nl/en/hitmanpro

    --------------------------------------------------------

    If necessary here are some free online scanners to help the

    http://www.eset.com/onlinescan/

    -----------------------------------

    Original version is now replaced by the Microsoft Safety Scanner
    http://OneCare.live.com/site/en-us/default.htm

    Microsoft safety scanner
    http://www.Microsoft.com/security/scanner/en-us/default.aspx

    ----------------------------------

    http://www.Kaspersky.com/virusscanner

    Other tests free online
    http://www.Google.com/search?hl=en&source=HP&q=antivirus+free+online+scan&AQ=f&OQ=&AQI=G1

    --------------------------------------------------------

    Also follow these steps for the General corruption of cleaning and repair/replace damaged/missing
    system files.

    Run DiskCleanup - start - all programs - Accessories - System Tools - Disk Cleanup

    Start - type this into the search-> find COMMAND to top box and RIGHT CLICK-
    RUN AS ADMIN

    Enter this at the command prompt - sfc/scannow

    How to analyze the log file entries that the Microsoft Windows Resource Checker
    (SFC.exe) program generates in Windows Vista cbs.log
    http://support.Microsoft.com/kb/928228

    Run checkdisk - schedule it to run at the next startup, then apply OK then restart your way.

    How to run the check disk at startup in Vista
    http://www.Vistax64.com/tutorials/67612-check-disk-Chkdsk.html

    -----------------------------------------------------------------------

    If we find Rootkits use this thread and other suggestions. (Run UnHackMe)

    http://social.answers.Microsoft.com/forums/en-us/InternetExplorer/thread/a8f665f0-C793-441A-a5b9-54b7e1e7a5a4/

    I hope this helps.

    Rob - bicycle - Mark Twain said it is good.

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    Hello

    I want to know who, how to access data from an html page to another html page using Javascript or HTML5?

    Thank you and best regards,

    Tejas

    After the installation of new WebWorksSDk, my problem is resolved automatically...

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