Skip to main content

SQLException: ORA-02020: too many database links in use.



You can limit the number of connections from a user process to remote databases using the static initialization parameter OPEN_LINKS. This parameter controls the number of remote connections that a single user session can use concurrently in distributed transactions.

If you are not sure how many database links are opened up concurrently by your session's database application, you can query v$dblink

select in_transaction, count(*) from v$dblink group by in_transaction;

To Increase the Database Links limit.  Follow the below.

SQL> select name from v$database;

NAME
---------------------------
ORCL


SQL> show parameter open_links;

NAME                                 TYPE                                         value
------------------------------------ --------------------------------- ------------------------------
open_links                           integer                                         4  


Default Value is > 4

Here have changed from 4 To 60.

SQL> ALTER SYSTEM SET OPEN_LINKS=60 SCOPE=SPFILE;

System altered.

NOTE: Parameter 'OPEN_LINKS' its static parameter. Hence database bounce is required, once change is made. Then only the new value will be effected.

SQL> select name from v$database;

NAME
---------------------------
ORCL

SQL> shut immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

SQL> startup
ORACLE instance started.

Total System Global Area 1073741824 bytes
Fixed Size                  2101808 bytes
Variable Size             377490896 bytes
Database Buffers          687865856 bytes
Redo Buffers                6283264 bytes
Database mounted.
Database opened.

SQL> show parameter open_links;

NAME                                 TYPE                                         value
------------------------------------ --------------------------------- ------------------------------
open_links                           integer                                         60


Thank You!
Labels:

Comments

Post a Comment

Popular posts from this blog

Issues and Solutions for Oracle 19c Grid Infrastructure Installation

     Common Issues and Solutions for Oracle 19c Grid Infrastructure Installation •       Check Log Files for Details Oracle installation issues often provide valuable clues in the log files. If the installer seems stuck or fails, check the following logs: ▪ Install log : /u01/app/oraInventory/logs/installActions<date>.log •       ▪ Grid Infrastructure log : $ORACLE_BASE/cfgtoollogs/ •         •       These logs can provide error messages and help identify the exact issue. •         •        Check Permissions and Ownership Verify that the Oracle Grid Infrastructure installation directories have the correct ownership and permissions. •        For example: •        Make sure the grid user has permission to write to the directories where the i...
Post a Comment
Read more

How to Improve Oracle Data Pump Performance - IMPDP

  How to Improve Oracle Data Pump Performance:- Use Parallelism : Set the PARALLEL parameter to at least 2 * number of CPUs . This allows multiple worker processes to perform tasks simultaneously, speeding up both export and import processes. Example: PARALLEL=4 for a system with 2 CPUs. Perform Import Using NETWORK_LINK : Use the NETWORK_LINK parameter to import data directly from the source database. This method is particularly helpful when space is constrained, as it streams the data without needing to generate dump files on the source. It can also reduce time compared to exporting and then importing, as data is streamed directly from the source to the target database. Disable Archivelog Mode (Standalone Databases) : For standalone databases, temporarily disable archive logging during the import process. Import operations can generate a lot of redo logs, slowing down the import. Disabling...
Post a Comment
Read more

Difference between AWR, ADDM and ASH reports

AWR: Automatic Workload Repository gathers, processes and maintains performance stats used for problem detection and self-tuning the databases. Different Components that uses AWR are: Automatic Database Diagnostic Monitor Undo Advisor SQL Tuning Advisor Segment Advisor Different types of AWR Reports for different purposes: For Single Instance Environment: @$ORACLE_HOME/rdbms/admin/awrrpt.sql For Oracle RAC Environment : @$ORACLE_HOME/rdbms/admin/awrgrpt.sql For a particular SQL Statement : @$ORACLE_HOME/rdbms/admin/awrsqrpt.sql For Comparing the reports : @$ORACLE_HOME/rdbms/admin/awrddrpt.sql ADDM: Automatic Database Diagnostic Monitoring Report analyzes the AWR data on a regular basis, to give you overview of the root cause of the problem which is affecting your database’s performance. It also provides suggestions or recommendations for rectifying any problem identified and lists the areas which are having no issues. ADDM recommends multiple solutions for the DBA to choose from which...
Post a Comment
Read more