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Cause: The current session has exceeded the INIT. ORA open_links maximum. Increase the open_links limit, or free up some open links by committing or rolling back the transaction and canceling open cursors that reference remote databases.
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You want to know if accessing a remote data source will not crash your query. But how do you know that unless you try your query?
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How to Resolve ORA-02020: too many database links in use
ORA-02020 means that the database limits the number of open database links on every session. You can wen the restrictions for later use.
Source: logic.edchen.org
Date Published: 10/4/2021
View: 3469
ORA-02020: too many database links in use – dbaclass
Here open_links is set to 4, i.e a session can access only 4 open database links in that session.When the open db_link connection reaches the limit(open_links), …
Source: dbaclass.com
Date Published: 6/3/2022
View: 5664
Too many database links in use (also a workaround for ORA …
ORA-02020 – Too many database links in use (also a workaround for ORA-28267 ) … In plain English, this means that the current session is using …
Source: dbtricks.com
Date Published: 8/14/2022
View: 596
ORA-02020: too many database links in use – IT Tutorial
Hi,. You can get “ORA-02020: too many database links in use ” error during the drop any user. Details of error are as follows. … Cause: The …
Source: ittutorial.org
Date Published: 2/11/2022
View: 3629
Troubleshoot : ORA-02020: too many database links in use
Cause: The current session has exceeded the INIT.ORA open_links maximum. … Increase the open_links limit, or free up some open links by …
Source: facedba.blogspot.com
Date Published: 2/25/2021
View: 8790
ORA-02020: too many database links in use — oracle-tech
ORA-02020: too many database links in use … This is a tad complex. Oracle 11.2.0.4 on all databases. ORDS server pool runs APEX code in the …
Source: community.oracle.com
Date Published: 5/19/2022
View: 554
ORA-02020 – Too many database links in use – Stack Overflow
… remote table. but after a few call my service which triggers procedure call i got ORA-02020 – Too many database links in use error.
Source: stackoverflow.com
Date Published: 8/14/2022
View: 4966
How to Resolve ORA-02020: too many database links
We have prepared a script to learn the fra status of database instances Oracle cloud control. It caused the ORA-02020 error because the …
Source: www.bigdba.com
Date Published: 5/4/2022
View: 1357
ORA-02020: too many database links in use – HPE Community
Re: ORA-02020: too many database links in use … // *Cause: The current session has exceeded the INIT.ORA open_links maximum. … // cursors that …
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Date Published: 5/20/2021
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주제와 관련된 이미지 ora 02020 too many database links in use
주제와 관련된 더 많은 사진을 참조하십시오 Testing database links without errors. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.
주제에 대한 기사 평가 ora 02020 too many database links in use
- Author: Connor McDonald
- Views: 조회수 487회
- Likes: 좋아요 11개
- Date Published: 2019. 4. 15.
- Video Url link: https://www.youtube.com/watch?v=y0fiYRO4z3Q
ORA-02020: too many database links in use
Cause: The current session has exceeded the INIT.ORA open_links maximum.
To find:
———
SQL> show parameter open_links;
NAME TYPE VALUE
———————————— ———– ——————————
open_links integer 4
open_links_per_instance integer 4
Action:
——-
Increase the open_links limit, or free up some open links by committing or rolling back the transaction and canceling open cursors that reference remote databases.
To Change:
———-
SQL> alter system set open_links_per_instance=10 scope=spfile;
SQL> alter system set open_links=10 scope=spfile;
and then, bounce the database.
How to Resolve ORA-02020: too many database links in use
ORA-02020
ORA-02020 means that the database limits the number of open database links on every session. You can widen the restrictions for later use. For example, after opening 4 db links, we failed to open the 5th db link.
SQL> select sysdate from dual@dblink01;
SYSDATE
——————-
2017-10-10 19:58:16
SQL> select sysdate from dual@dblink02;
SYSDATE
——————-
2017-10-10 19:58:22
SQL> select sysdate from dual@dblink03;
SYSDATE
——————-
2017-10-10 19:58:33
SQL> select sysdate from dual@dblink04;
SYSDATE
——————-
2017-10-10 19:58:39
SQL> select sysdate from dual@dblink05;
select sysdate from dual@dblink05
*
ERROR at line 1:
ORA-02020: too many database links in use
Rationale
This is because both server parameter OPEN_LINKS and OPEN_LINKS_PER_INSTANCE are too small.
SQL> show parameter open_links
NAME TYPE VALUE
———————————— ———- ——————————
open_links integer 4
open_links_per_instance integer 4
As we can see, OPEN_LINKS and OPEN_LINKS_PER_INSTANCE are now 4, which is the default value, which may be too small for a production database.
Solutions
1. Release Some DB Links
The first solution is to close some of the db links to release quota of open links before opening other db link.
SQL> alter session close database link dblink04;
Session altered.
Or by package DBMS_SESSION.CLOSE_DATABASE_LINK.
SQL> exec dbms_session.close_database_link (‘DBLINK04′);
PL/SQL procedure successfully completed.
Usually, we can’t close any db link at this moment because of some ORA error. We need more steps to resolve ORA-02080: database link is in use.
2. Raise OPEN_LINKS
The second solution is to raise the number of open db links.
SQL> alter system set open_links=20 scope=spfile sid=’*’;
System altered.
SQL> alter system set open_links_per_instance=20 scope=spfile sid=’*’;
System altered.
Both parameters cannot take effect online. We should restart the database.
SQL> shutdown immediate;
SQL> startup;
Now we can open the 5th db links.
For more about database links, I have talked about it at: DB Link, How and Why.
ORA-02020: too many database links in use
PROBLEM:
While querying against a database link, got below error.
select sysdate from dual@DB5 * ERROR at line 1: ORA-02020: too many database links in use
CAUSE & SOLUTION:
open_links parameter control, the number of database links each session can use without closing it.
If you access a database link in a session, then the link remains open until you close the session.
SQL> show parameter open_link NAME TYPE VALUE ———————————— ———– —————————— open_links integer 4 open_links_per_instance integer 4
Here open_links is set to 4, i.e a session can access only 4 open database links in that session.When the open db_link connection reaches the limit(open_links), it throws ORA-02020: too many database links in use.
Solution:
1. Close the open db_link connections
2. Increase the open_links parameter (bounce required)
Let’s reproduce this error.
SQL> select sysdate from dual@DB1; SYSDATE ——— 30-JUL-17 SQL> select sysdate from dual@DB2; SYSDATE ——— 30-JUL-17 SQL> select sysdate from dual@DB3; SYSDATE ——— 30-JUL-17 SQL> select sysdate from dual@DB4; SYSDATE ——— 30-JUL-17 SQL> select sysdate from dual@DB5; select sysdate from dual@DB5 * ERROR at line 1: ORA-02020: too many database links in use
Now we reached maximum open database link connections.
— View the open database link connection[Need to run this from same session ]
— The table v$dblink populates data only for the current session, SQL> select db_link,logged_on,open_cursors from v$dblink; DB_LINK LOG OPEN_CURSORS —————- — ———— DB1 YES 0 DB2 YES 0 DB3 YES 0 DB4 YES 0
We can see there are 4 open database link transactions and it is matching the open_links parameter( i.e 4). So quick way to fix is to close these connections.
SQL> alter session close database link DB4; ERROR: ORA-02080: database link is in use
Now we are getting an ORA-02080 error. So before closing the database link, we need to either commit/rollback.
SQL> commit; Commit complete. SQL> alter session close database link DB4; Session altered. SQL> select db_link,logged_on,open_cursors from v$dblink; SQL> select db_link,logged_on,open_cursors from v$dblink; DB_LINK LOG OPEN_CURSORS —————- — ———— DB1 YES 0 DB2 YES 0 DB3 YES 0
SQL> select sysdate from dual@DB5; SYSDATE ——— 30-JUL-17
Alternative solutions is:
Increase the open_links parameter.
alter system set open_links=8 scope=spfile; shutdown immediate; startup
ORA-02020 – Too many database links in use (also a workaround for ORA-28267 )
If many of your queries are done over db links, you will probably encounter the ORA-02020
(too many database links in use) error. The cause for this error according to the Oracle documentation is ” The current session has exceeded the INIT.ORA open_links maximum” . The default value for this parameter is 4 but this can easily be verified by running the following query
select * from v$parameter where name =’open_links’
In plain English, this means that the current session is using more than 4 db links.
The problem is that Oracle keeps the database link open until the session is closed. This is especially problematic when working with Weblogic data sources pools for example. Since the Weblogic server keeps its session open constantly, all queries are using the same session (or sessions). This cause the number of open links to accumulates with every query from a new remote server. The final result is that when the fourth database link is used the “ora-02020-too many database links in use” is raised. The fact that many times this message is raised when running a query that uses only one database link makes it hard to debug.
According to Oracle the solution is to Increase the open_links limit, or free up some open links by committing or rolling back the transaction and canceling open cursors that reference remote databases. However, changing the open_links parameter can not be done online and require downtime. In addition, not every DBA will be happy to increase this parameter.
Using the following query to identify the number of open database links will show that rolling back or committing does not always free up the open links.
select db_link from v$dblink;
The solution is to actively close the db link after every query using the following command.
DBMS_SESSION.CLOSE_DATABASE_LINK (‘DB LINK NAME’)
This is equivalent to
execute immediate ‘alter session close database link DB LINK NAME’
However, it is not always feasible to change existing code. A possible solution might be to create a procedure that will close all open db links and run it after or before queries that uses database links.
create or replace procedure rollback_and_close_db_links
authid current_user is
begin
rollback;
for links in (select db_link from v$dblink) loop
DBMS_SESSION.CLOSE_DATABASE_LINK (links.db_link);
end loop;
end;
UPDATE: Apperantly, this procedure can act as a workaround for the ORA-28267 Invalid NameSpace error that could happen when your SOA suite connects to a database using JDBC and try to invoke an object that connect to a remote DB. For example, weblogic connects to a function on one DB and this function uses a db link. if you add a call to “rollback_and_close_db_links ” before returning the result, you can workaround this error.
ORA-02020: too many database links in use
ORA-02020: too many database links in use
Hi,
You can get “ORA-02020: too many database links in use ” error during the drop any user.
Details of error are as follows.
ORA-02020: too many database links in use
Cause: The current session has exceeded the INIT.ORA open_links maximum.
Action: Increase the open_links limit, or free up some open links by committing or rolling back the transaction and canceling open cursors that reference remote databases.
*
ERROR at line 1:
ORA-02020: too many database links in use select * from [email protected] _MSDERROR at line 1:ORA-02020: too many database links in use
Check the existing Database links as follows. SQL > select db_link , logged_on , open_cursors from v $ dblink ;
To solve this error, You should increase the open_links parameter as follows.
alter system set open_links=20 scope=spfile sid=’*’; alter system set open_links_per_instance=20 scope=spfile sid=’*’; Then restart database to activate this parameter as follows. shutdown immediate; startup
If you don’t want to increase open_links because of restart database, then you can close the existing database links as follows.
SQL> exec DBMS_SESSION.CLOSE_DATABASE_LINK (Database_Link_Name); SQL> alter session close database link Database_Link_Name;
Do you want to learn Oracle Database for Beginners, then read the following articles.
https://ittutorial.org/oracle-database-19c-tutorials-for-beginners/
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ORA-02020: too many database links in use
This is a tad complex. Oracle 11.2.0.4 on all databases.
ORDS server pool runs APEX code in the local master database. This code (for specific reporting) connects to a remote master database (commercial app db) for selecting from a (parameterised) view.. So far, so good. No problems.
The remote master database has my custom parameterised views. These views are on pipelines I created. The PL/SQL pipeline code uses the parameters received, to determine what remote slave database to query (using the commercial app’s config tables). It then uses a ref cursor (dynamic SQL) to run the custom select against a remote slave database. It fetches the rows from the slave database, pipes rows, that are then seen/fetched by the APEX report SQL on the local master database. The remote master database’s pipeline code has over 10 remote slave databases to choose from, for running against.
So local master runs “select * from [email protected]_master”. Remote master pipeline for param_view runs “select * from [email protected]_slave_5”. There are 10+ remote slave databases.
Works very well. Except for sessions on remote master db reporting on the odd occasion “ORA-02020: too many database links in use”.
The pipeline code, at the start of its execution, determine which remote slave database to use. It then proceed to close any database links to the other remote slave databases that may exist in that remote master db session.
A close db link fails when there are open cursor handles not yet closed, referencing objects via the db link. But my pipeline code explicitly opens, and explicitly closes, the ref cursor created to query the remote slave database.
Any ideas why the ORA-02020 can be triggered, in such a case?
Troubleshooting this is difficult due to the number of database layers, and the lack of access to X$ views on the remote master database to look at what db links exists and for which sessions.
ORA-02020 – Too many database links in use
i have a web based application which uses weblogic connection pooling while accessing oracle db. there is a procedure in which i must use db link to fetch and update remote table. but after a few call my service which triggers procedure call i got ORA-02020 – Too many database links in use error.
I think it causes from weblogic connection pool, it does not close session so db link is not closed and it reached max dblink count after a few try.
i’ve found http://dbtricks.com/?p=198 work around solution but it have not worked for me. i must use db link so what should i do? is there any solution for my case?
thanks.
How to Resolve ORA-02020: too many database links
How to Resolve ORA-02020: too many database links
We have prepared a script to learn the fra status of database instances Oracle cloud control. It caused the ORA-02020 error because the open_links parameter was insufficient.
SQL> select * from dual@dbllink; ORA-02020: too many database links in use
This is because both the OPEN_LINKS and the OPEN_LINKS_PER_INSTANCE server parameter are too small.
SQL> show parameter open_links
NAME TYPE VALUE
———————————— ———- ——————————
open_links integer 5
open_links_per_instance integer 5
The first solution did not work for us.
SQL> exec dbms_session.close_database_link (‘dbllink’); PL/SQL procedure successfully completed.
Or
exec dbms_session.close_database_link (‘dbllink’);
Unfortunately, we are left with no other choice but the second solution.
SQL> alter system set open_links=50 scope=spfile sid=’*’;
SQL> alter system set open_links_per_instance=50 scope=spfile sid=’*’;
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