On : 11.2.0.4 version, Clusterware, when attempting to connect to database via listener, the following error occurs: ERROR ----------------------- ERROR: ORA-12518: TNS:listener could not hand off client connection 15-AUG-2017 01:40:01 * (CONNECT_DATA=(CID=(PROGRAM=myapp)(HOST=__jdbc__)(USER=admin))(SERVER=DEDICATED)(SERVICE_NAME=oracle)) * (ADDRESS=(PROTOCOL=tcp)(HOST=11.22.33.44)(PORT=1521)) * establish * oracle * 12518 TNS-12518: TNS:listener could not hand off client connection … [Read more...] about ORA-12518: TNS:listener Could Not Hand Off Client Connection
Oracle 12c Multitenant Architecture: Troubleshooting Ora-12518
The Problem When attempting to connect to PDB via listener, the following error occurs. ORA-12518: TNS:listener could not hand off client connection Listener log: 03-APR-2017 08:57:31 * (CONNECT_DATA=(SID=wd1)(CID=(PROGRAM=d:\orasfw\prd1\bin\sqlplus.exe)(HOST=Host name )(USER=ismeirb))) * (ADDRESS=(PROTOCOL=tcp)(HOST=XX.XX.XX.XX)(PORT=63994)) * establish * wd1 * 12518 TNS-12518: TNS:listener could not hand off client connection TNS-12560: TNS:protocol adapter error TNS-00530: … [Read more...] about Oracle 12c Multitenant Architecture: Troubleshooting Ora-12518
Empty Directories in the Flash Recovery Area (FRA) are not deleted
The Problem RMAN archived redolog backups and maintenance commands are deleting files from the Flash Recovery Area (FRA) when needed. For example: RMAN> backup archivelog all delete input; delete obsolete; These commands only delete the files, but not the actual directories when they are empty after the deletion of the files. The Solution When there is an empty subdirectory that is more than 7 days old, they will get purged automatically at the end of controlfile backup. The … [Read more...] about Empty Directories in the Flash Recovery Area (FRA) are not deleted
Beginners Guide to Flash Recovery Area in Oracle Database
This post discusses the below topics: Benefits of using Flash Recovery Area. Explains how to Create FRA using DB_RECOVERY_FILE_DEST_SIZE and DB_RECOVERY_FILE_DEST Database Files that can reside in Flash Recovery Area. How to Disable FRA What is a Flash Recovery Area? The flash recovery area can be defined as a single, unified storage area that keeps all the database recovery related files and performs recovery activities in an Oracle database. The flash recovery area is the most … [Read more...] about Beginners Guide to Flash Recovery Area in Oracle Database
Oracle Interview Questions – Flash Recovery Area
Naming convention: Oracle 10g: FLASH Recovery Area Oracle 11g: FAST Recovery Area 1. What is a Flash Recovery Area ? The flash recovery area is an Oracle-managed directory, file system, or Automatic Storage Management disk group that provides a centralized disk location for backup and recovery files. All the files you need to completely recover a database from a media failure are part of the Flash Recovery Area. Oracle creates archived logs and flashback logs in the flash recovery area. … [Read more...] about Oracle Interview Questions – Flash Recovery Area
How to Identify Different File types and space used in Flash Recovery Area
Question: How to find out the existence of different types of files and backups available with the usage of space in the Flash Recovery Area? Starting with Oracle 10G Release 2, a new view has been made available: V$FLASH_RECOVERY_AREA_USAGE. V$FLASH_RECOVERY_AREA_USAGE shows the percentage of the total disk quota used by different types of files, and how much space for each type of file can be reclaimed by deleting files that are obsolete, redundant, or already backed up to tape. SQL> … [Read more...] about How to Identify Different File types and space used in Flash Recovery Area
Database Crashed With ORA-19815, ORA-19809, ORA-16038
The Problem Instance terminated due to error 16038 as its not able to archive the log in FRA: ORA-19815: WARNING: db_recovery_file_dest_size of 99614720000 bytes is 100.00% used, and has 0 remaining bytes available. Sat Mar 8 00:57:07 2008 ************************************************************************ You have following choices to free up space from flash recovery area: 1. Consider changing RMAN RETENTION POLICY. If you are using Data Guard, then consider changing RMAN … [Read more...] about Database Crashed With ORA-19815, ORA-19809, ORA-16038
How to Verify a Lun is in Active/Optimized Mode when ALUA Is Configured on Storage
If the Linux server has device-mapper-multipath configured, you can run 'multipath -ll' to list how disks are grouped together. For ALUA mode, you can check if a disk is in the Active/Optimized or non-optimized group. This post, however, is to discuss how to use sg_rtpg command to check the target port group asymmetric access state (aas). Along with sg_inq command, you can check if a specific disk (/dev/sdX) is in Active/optimized group or not. You can use sg_rtpg to decode the status code … [Read more...] about How to Verify a Lun is in Active/Optimized Mode when ALUA Is Configured on Storage
Oracle Database – Measuring Network Capacity using oratcptest
The Basics Oratcptest is a command line tool that runs on two hosts, one in client mode and the other in server mode, to measure network bandwidth and latency between client and server. Oratcptest establishes a TCP connection between the client host and server host and then sends network messages to Oratcptest on the server host. Oratcptest running on the server host writes, if desired, the received messages to disk before replying with the ACK message. Oratcptest could be used as a general … [Read more...] about Oracle Database – Measuring Network Capacity using oratcptest
How to Create Yum Repository For System Packages Installation in CentOS/RHEL
A yum repository holds the rpms and metadata about the rpms. A yum repository must be configured in order to use yum on any yum based Linux system. This post provides steps to configure a yum repository for installing packages on CentOS/RHEL systems. Configuring yum repository server 1. Create a directory for you local repository, e.g. /home/mypackage_dir/repository. Move the RPMs into that directory. # cp /media/packages/* /home/mypackage_dir/repo 2. Fix some ownership and filesystem … [Read more...] about How to Create Yum Repository For System Packages Installation in CentOS/RHEL