Server Administration :: Limitations Of Database Links
Jan 25, 2012
I'm currently assessing the design/performance of a Distributed System in which hundreds of Field reps have local Oracle DBs (10.2.0.4) on laptops & have to update a remote database (11.2.0.1) via a PUBLIC database link. Field data (millions of records) collected daily is synched from the local to the remote DB & vise versa through this database link. I have 2 concerns here:
1. Is the database link the best option for such a configuration? (recently field reps have been complaining about the slowness in synchronizing data between local & remote DBs). If not, what other options are available for such processing?
2. I've read a lot about security concerns with using PUBLIC database links, but haven't seen any documents to proof they're a majority security issue. why PUBLIC database links are considered not to be very secure?
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Apr 15, 2011
I have read following statement from a link [URL]...
Oracle Database XE can be installed on any size host machine with any number of CPUs (one database per machine), but XE will store up to 4GB of user data, use up to 1GB of memory, and use one CPU on the host machine.
calculation of this 4GB size. how can we calculate this size?
by simply going to DBF file and seeing their size?
or
by exporting dump and seeing the size of that dump?
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Dec 24, 2011
I downloaded the oracle 11g R2 from oracle site. I am using the database for tests in one machine there are 5 months and it works normally (with all features).
My question is, what limitations of this database? What's prevents me to use this db in production environment?
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Jun 10, 2013
I am trying to retrieve info from multiple DBs and insert into a central DB via DB LINKS.The links are retrieved via a cursor.
However I keep coming up against 'PL/SQL: ORA-00942: table or view does not exist'..how to handle db_links using a cursor in a pl/sql block? The code is as follows:
DECLARE
db_link_rec VARCHAR2(30);
CURSOR db_link_cur IS
SELECT DB_LINK
from MESSAGING_PROD_LIST;
BEGIN
OPEN db_link_cur;
LOOP
FETCH db_link_cur INTO db_link_rec;
EXIT when db_link_cur%NOTFOUND;
[code]....
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May 16, 2013
I have a view called V_MEDGEN_LISTRADIO but I can't run SELECT * FROM V_MEDGEN_LISTRADIO
ORA-02020: too many database links in useThe cause is that we call in the view 5 tables over dblink and the open_links parameter is set to 4.
What is strange is that when I run this select by adding a where clause then it works!
SELECT * FROM V_MEDGEN_LISTRADIO WHERE SPRR = 3645;
(use of index so all tables are not called ?)
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Nov 14, 2011
I am using SQL Developer.I am self-teaching myself PL/SQL. What I am trying accomplish is to run a select query across many database links at runtime and to insert that query onto a local table. So far, I have only gotten as far as querying the database link names. I am stuck at where my variable calls the database link name. It does not recognize the database link name, and I can't quite grasp the reason why. Below is the first part of my script which does retrieves the column values no problem:
001 SET SERVEROUTPUT ON
002 DECLARE
003 db_link_varVARCHAR2(30);
004 source_cursorINTEGER;
005 destination_cursorINTEGER;
006 src_csrINTEGER;
007 dst_csrINTEGER;
008 rundate_varDATE;
009 instance_name_var VARCHAR2(30);
[code]....
If I break the script down to the bare select query, it will query absolutely fine.If I run the script in its entirety, it will not pick up the variable dbl as a dynamic database link. 02019. 00000 - "connection description for remote database not found"
If I comment out line 031 and prevent the looping of querying of database links (which will only fetch the first value of db_link from dba_db_links), the script will complete and I will have a row inserted into my local table.
I am suspecting it's the looping that is incorrect but I understand it is not going to do anything beyond line 059.
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Jul 21, 2011
how to find out what are all the objects referring to particular database links in database?
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Jul 2, 2011
There is a user account called 'BALA' in my database.I want to find out the database links that uses this 'BALA' account.
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Jul 23, 2013
is there any way to refer a table which is in different schema other than using DB links.
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Oct 14, 2013
A website requires to display consolidated data from databases located in different geographical regions (India, London and New York). The application server for the website is hosted only in one location India. What are the techniques that can be used for faster retrieval of data from all 3 databases?
Note: There is no need of real time data retrieval from different regions; however the user should able to view the updated data at predefined intervals.
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Jun 15, 2013
I know how to use database links in various forms, but I've been trying to think through how the authentication works for a connected user link in 11g. If I create the link like this,
create public database link using 'orcl';
then any user can use the link, provided they have an identical username/password in the two databases. With pre-11g passwords, it was understandable: the password was salted with the username, so the hash of the password would be the same in both databases, and I assumed that the logon through the link used some sort of IDENTIFIED BY VALUES mechanism. But in 11g, the salt will different in the two databases. So the hash will be different. And of course Oracle never stores the actual password. So I don't see how the authentication works.
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Dec 19, 2011
I would like to know if we can insert 300 million records into an oracle table using a database link. The target table is inproduction and the source table is in development on different servers.The target table will be empty and have its indexes disabled before the insert. if this can be accomplished in less than 1 hour.
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Jun 16, 2013
I know how to use database links in various forms, but I've been trying to think through how the authentication works for a connected user link in 11g. If I create the link like this,create public database link using 'orcl';then any user can use the link, provided they have an identical username/password in the two databases. With pre-11g passwords, it was understandable: the password was salted with the username, so the hash of the password would be the same in both databases, and I assumed that the logon through the link used some sort of IDENTIFIED BY VALUES mechanism. But in 11g, the salt will different in the two databases. So the hash will be different. And of course Oracle never stores the actual password. So I don't see how the authentication works.
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Mar 26, 2011
i am installing oracle database 8.1.7 on dell server power edge 2650 first time database successfully installed but when i want to crate new database by Database Configuration Assistant it is not working for new database creation.
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Dec 31, 2011
limitations of REf cursor? and What is the difference in declaring as SYS_REFCURSOR and REFCURSOR?
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Jan 2, 2013
how to insert the data in multiple bases( Same table structure in different bases) using the multiple database links?
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Sep 16, 2013
explain limitation / restrictions on WITH clause in oracle.
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Jan 11, 2011
i am trying to install Oracle 10.10.2.0 on Windows Server 2003 standard x64 Edition Service Pack, but when i try to run the installer or open DVD it gives me below error.
"The image file D: is Valid, but is for a machine type other than the current machine."
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Oct 31, 2012
I have to migrate production database version 10gR2 on windows 2003 server to oracle 11gR2 on windows 2008 server . So far i have just installed the oracle software on 64bit windows 2008 server. How to move the data or migrate from old server to new server .
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Feb 13, 2013
I am trying to find the unix process for one of my application in the database but I am unable to view the same. To simulate, I did the following.
1. My database runs on different server.
2. I invoked "sqlplus" from another unix box to login to the database.
3. I found that the process id (ps -ef |grep sqlplus).
4. When I execute the below mentioned query it does not display the process id that I am looking for. But the osuser, username, program and machine details are correct. How can I know the process details from the database?
SELECT SYS.GV_$SESSION.OSUSER, SYS.GV_$SESSION.USERNAME, SYS.GV_$PROCESS.SPID,
SYS.GV_$SESSION.MACHINE, SYS.GV_$SESSION.PROGRAM,
SYS.GV_$PROCESS.PROGRAM ,SYS.GV_$SESSION.SQL_ID
FROM
SYS.GV_$PROCESS, SYS.GV_$SESSION
WHERE
SYS.GV_$PROCESS.ADDR=SYS.GV_$SESSION.PADDR and SYS.GV_$SESSION.USERNAME='TEST'
and SYS.GV_$SESSION.MACHINE like '%hostname%'
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Apr 18, 2011
I have database in single server. I already have ORACLE_SID=stagedb. So i want to create new sid and named as proddb.Is it possible have multiple db in single server? This server not running as RAC. It run as single only.
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Apr 30, 2012
database administration , we are planning to use amazon cloud database , this database does not allow us to login to server machine , unfortunately amazon don't provide ssh to this machine , in general for doing any of adminstration task on the database will there be need to log into the machine ? we can always log in through toad or any other sql client but we cannot do ssh to server..general can this limitation effect administration ?
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Jun 29, 2011
I recently installed Oracle 10g on my windows Xp laptop. It has become considerably slow since then. I want to start the database server only when I need it, and not every time I start my laptop. I looked around in OEM and did found a way.
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Jul 19, 2011
I am connected as System. It was the only user I set-up a password when installed the database on personal computer.
SQL> alter user sys identified by mypass007
2 /
User altered.
SQL> connect sys/mypass007
ERROR:
ORA-28009: connection as SYS should be as SYSDBA or SYSOPER
[code]...
SQL> conn sysoper/mypass007
ERROR:
ORA-01017: invalid username/password; logon denied
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Oct 22, 2011
I want to know if I can access a procedure created on Database server A from database server B.
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Jun 22, 2011
We have an Oracle Server database of Size 50 GB having 10 GB Data. And Planning to have a new Database Server of 200GB . So my question is after moving all the 10 GB data to 200 GB Database Server, will the performance of the system come down? Will it reduce the speed?
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Apr 17, 2011
Can I extract data from our Oracle server regarding the no. of sessions per day? But the problem is that our Boss wants a previous dates from April 11-17, 2011.
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Aug 17, 2010
I have some requirement wherein I need to install Oracle 9i database server (9.2.0.7). I am not getting it on Oracle website. where can I get the download.
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Jun 22, 2012
I am trying to do a Flash Chart in APEX 3.1. Is there a limitation on how many labels I can get horizontally. No matter what I do the number of labels I get horizontally is 15. We are trying to show the amount of days in a month.... Can I do that? If so how?
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Jun 10, 2010
see as i said keep on my database down in the night time around 9 pm. the OS redhat linux 5 restarting morning around 6.45 am.when i check alert_log there is no indication.when i check OS log , OS restarting around 6.45 amchecked in the log file in OS level
location: /var/log
i found this
Jun 7 06:45:33 Alraya syslogd 1.4.1: restart.
Jun 8 06:42:22 Alraya syslogd 1.4.1: restart.
Jun 9 06:47:12 Alraya syslogd 1.4.1: restart.
what is this mean, system restarting around 6:45 daily i think now i m posting listener.log for reference
<b>06-JUN-2010 21:04:52 *</b> (CONNECT_DATA=(CID=(PROGRAM=)(HOST=Alraya)(USER=alrayaora))(COMMAND=status)(ARGUMENTS=64)(SERVICE=(ADD
RESS=(PROTOCOL=TCP)(HOST=Alraya)(PORT=1521)))(VERSION=169869568)) * status * 0
06-JUN-2010 21:05:05 * (CONNECT_DATA=(SID=alraya)(CID=(PROGRAM=perl@Alraya)(HOST=Alraya)
[code]...
OS is restarting around 6.45 in the morning, but database getting down night around 9 pm itself why then in the morning if i bounce the database it starting with no problem
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