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Posts Tagged ‘replication’

OGG-01201 Error reported by MGR Access denied

Posted by FatDBA on August 22, 2021

Hi Guys,

Last week encountered a problem with one old GG setup running on v12.2 where the extract was failing with errors OGG-01201/OGG-01668 when doing Initial load.

ERROR   OGG-01201  Oracle GoldenGate Capture for Oracle, exld1.prm:  Error reported by MGR : Access denied
ERROR   OGG-01668  Oracle GoldenGate Capture for Oracle, exld1.prm:  PROCESS ABENDING

This ‘access denied’ error was there even when the login information was correct for both source and target systems. I was overly confused and wasn’t sure what was causing the issue!

What I come to know after reading a particular piece of documentation, in version 12.2 of GG, the default behavior is the MANAGER and related EXTRACT/REPLICAT cannot be started or stopped remotely as by default there is only deny rule. And while I was trying to do the initial load on the source server and attempts to starts the replicat on target server, I hit the error. This is a security feature and is to prevent unauthorized access to Oracle GoldenGate manager processes and the processes under its control.

Solution to the problem is add “ACCESSRULE, PROG *, IPADDR *, ALLOW” to your manager parameter file on the target system, something like below. The ACCESSRULE parameter restricts the remote system access.

-- GoldenGate Manager Parameter File (mgr.prm) on Target system
--
userid xxxxxxx, password xxxxxxx
PORT 7810
ACCESSRULE, PROG REPLICAT, IPADDR 10.11.01.15, ALLOW
PURGEOLDEXTRACTS ./dirdat/rp*, USECHECKPOINTS, MINKEEPHOURS 4

Here you can also set priority using PRI (0-99) which specifies the priority. The PROG parameter could be anything like GGSCI, GUI, MGR/MANAGER, REPLICAT, COLLECTOR|SERVER and * for all options (default). IPADDR specifies from which IP can access the specified program. Login_ID specifies with RMTHOST configuration and ALLOW | DENY specifies allow or deny the access.

Hope It Helped!
Prashant Dixit

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What’s new in Golden Gate version 21c ?

Posted by FatDBA on August 20, 2021

Hi Guys,

Oracle has recently released Golden Gate version 21.1, this happened immediately after they released database version 21c (21.3) for on-prem. Today’s post is all about new features and changes happened with this new GG version.

  • Oracle GoldenGate is available with Microservices Architecture : This release of Oracle GoldenGate is available with Microservices Architecture only.
  • This release of Oracle GoldenGate is available with Microservices Architecture only.
  • Automatic Extract of tables with supplemental logging is supported : Oracle GoldenGate provides a new auto_capture mode to capture changes for all the tables that are enabled for logical replication. You can list the tables enabled for auto-capture using the LIST TABLES AUTO_CAPTURE command option. Use the TRANLOGOPTIONS INTEGRATEDPARAMS auto_capture option to set up automatic capture.
  • Oracle native JSON datatype is supported : Oracle GoldenGate capture and apply processes now support the new native JSON datatype, which is supported by Oracle Database 21c and higher.
  • Enhanced Automatic Conflict Detection and Resolution for Oracle Database 21c
  • Autonomous Database Extract is supported : Oracle GoldenGate can now capture from the Autonomous Databases in OCI.
  • Large DDL (greater than 4 MB) replication is supported : DDLs that are greater than 4 MB in size will be provided replication support.
  • DB_UNIQUE_NAME with heartbeat table : DB_UNIQUE_NAME is available with the heartbeat table to allow users to uniquely identify the source of the heartbeat.
  • Oracle GoldenGate binaries are no longer installed on a shared drive : Oracle always recommended installing the Oracle GoldenGate binaries (OGG_HOME) on a local file system as a best practice. From this release onward, it is a requirement. The binaries must be installed on local drives.
  • Partition Filtering
  • A new Extract needs to be created when the DB timezone is changed : You need to create new Extract if DB timezone is changed, especially in case of Oracle Cloud deployment.
  • DB_UNIQUE_NAME with trail file header : DB_UNIQUE_NAME is added in the trail file header along with DB_NAME, which helps in troubleshooting replication in active-active environments, where mostly all replicas have the same DB_NAME but identify each replica site uniquely using the DB_UNIQUE_NAME.
  • Per PDB Capture
  • Parallel Replicat Core Infrastructure Support for Heterogeneous Databases : Parallel Replicat is supported with SQL Server, DB2 z/OS, and MySQL.

Release announcement link : https://blogs.oracle.com/dataintegration/oracle-goldengate-21c-release-announcement

Hope It Helped
Prashant Dixit

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Kafka Producer: Error while fetching metadata with correlation id INVALID_REPLICATION_FACTOR

Posted by FatDBA on August 14, 2021

Hi Guys,

Recently I was working on a replication project where we used Kafka to move data from source to target. I tried to create a test topic using Kafka producer console and immediately kicked out with error which says “INVALID_REPLICATION_FACTOR”. This we were doing on a test VM with single CPU and with limited system resources.

[root@cantowintert bin]#
[root@cantowintert bin]# kafka-console-producer.sh --broker-list 127.0.0.1:9092 --topic first_topic
OpenJDK 64-Bit Server VM warning: If the number of processors is expected to increase from one, then you should configure the number of parallel GC threads appropriately using -XX:ParallelGCThreads=N
>hello prashant
[2021-07-26 08:18:30,051] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 40 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:30,154] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 41 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:30,260] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 42 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:30,367] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 43 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:30,471] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 44 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:30,576] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 45 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:30,681] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 46 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:30,788] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 47 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:30,896] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 48 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:31,000] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 49 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:31,103] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 50 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:18:31,221] WARN [Producer clientId=console-producer] Error while fetching metadata with correlation id 51 : {first_topic=INVALID_REPLICATION_FACTOR} (org.apache.kafka.clients.NetworkClient)
^Corg.apache.kafka.common.KafkaException: Producer closed while send in progress
        at org.apache.kafka.clients.producer.KafkaProducer.doSend(KafkaProducer.java:909)
        at org.apache.kafka.clients.producer.KafkaProducer.send(KafkaProducer.java:885)
        at kafka.tools.ConsoleProducer$.send(ConsoleProducer.scala:71)
        at kafka.tools.ConsoleProducer$.main(ConsoleProducer.scala:53)
        at kafka.tools.ConsoleProducer.main(ConsoleProducer.scala)
Caused by: org.apache.kafka.common.KafkaException: Requested metadata update after close
        at org.apache.kafka.clients.producer.internals.ProducerMetadata.awaitUpdate(ProducerMetadata.java:126)
        at org.apache.kafka.clients.producer.KafkaProducer.waitOnMetadata(KafkaProducer.java:1047)
        at org.apache.kafka.clients.producer.KafkaProducer.doSend(KafkaProducer.java:906)
        ... 4 more
[root@cantowintert bin]#

Lets check what is captured in Kafka server startup logs, and we found the hint that the RF is > than the available brokers.

org.apache.kafka.common.errors.InvalidReplicationFactorException: Replication factor: 1 larger than available brokers: 0.
[2021-07-26 08:24:45,723] WARN [Controller id=0, targetBrokerId=0] Connection to node 0 (cantowintert.bcdomain/192.168.20.129:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:25:06,830] WARN [Controller id=0, targetBrokerId=0] Connection to node 0 (cantowintert.bcdomain/192.168.20.129:9092) could not be established. Broker may not be available. (org.apache.kafka.clients.NetworkClient)
[2021-07-26 08:25:27,950] WARN [Controller id=0, targetBrokerId=0] Connection to node 0 (cantowintert.bcdomain/192.168.20.129:9092) could not be established. Broker may not be available. 

Solution to the problem is to uncomment this line and restart and try to edit the topic all over again.

listeners=PLAINTEXT://:9092

changed this to

listeners=PLAINTEXT://127.0.0.1:9092

Hope It helped
Prashant Dixit

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What is that strange looking TRANLOGOPTIONS EXCLUDETAG in parameter file ?

Posted by FatDBA on August 11, 2021

Hi Guys,

Recently someone asked why we have this strange looking entry in Golden Gate extract parameter file which reads ‘TRANLOGOPTIONS EXCLUDETAG 00‘. Why is that, what are those numbers ? I was able to explain him the purpose, would like to write a short post about it.

OGG v12.1.2 has a new EXTRACT parameter TRANLOGOPTIONS EXCLUDETAG. This is typically used to exclude the REPLICAT user in bi-directional configurations. When Extract is in classic or integrated capture mode, use the TRANLOGOPTIONS parameter with the EXCLUDETAG tag option. This parameter directs the Extract process to ignore transactions that are tagged with the specified redo tag. For example:

extract exttestpd
useridalias clouduser
EXTTRAIL ./dirdat/rp, format release 12.1
ddl include all
ddloptions addtrandata, report
tranlogoption excludetag 00 
TABLE dixituser.*;

Changes made by Integrated REP are tagged by default in redo as 00. So adding the EXTRACT parameter TRANLOGOPTIONS EXCLUDETAG 00 Would exclude those operations. The tag can also be explicitly set in REPLICAT using:

DBOPTIONS SETTAG 0885

Then in EXTRACT param:

TRANLOGOPTIONS EXCLUDETAG 0885

The TRANLOGOPTION EXCLUDETAG 00 prevents Golden Gate extract from capturing transactions from the replication which are by default tagged with “00”. The excludetag will ensure that the we don’t run into problems with ping-pong updates.

Some other possible examples of using this parameter are …

TRANLOGOPTIONS EXCLUDETAG 00
TRANLOGOPTIONS EXCLUDETAG +
TRANLOGOPTIONS EXCLUDETAG 0991
TRANLOGOPTIONS EXCLUDETAG 2222 4444

Hope It Helped
Prashant Dixit

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Running on Oracle 19c ? – Why to enable full supplemental logging when SUBSET DATABASE REPLICATION is there

Posted by FatDBA on June 26, 2021

Hi Folks,

Today’s post is about one of the cool feature added in Oracle 19c, that is very useful and I recently discovered about it while working on one GG setup.

This is about Supplemental logging which enables database to capture extra logging for a redo-based application i.e. logical standby or Golden Gate, this may require that additional columns be logged in the redo log files and causes a great stress and overhead on the database. Things looks very unworthy specially if you are doing only a partial Golden Gate replication, I mean for only few tables.

Starting from Oracle 19c, this is something that you can now control. With this version, you can enable the fine grain supplemental logging (SUBSET DATABASE REPLICATION) which will reduce lot of logging overhead. This feature allows you to disable supplemental logging on the entire database and on all tables. So, if you are running on Oracle 19c and your have the COMPATIBLE parameter to 19.0.0.0.0 or greater and have enabled enable_goldengate_replication parameter to TRUE, you can use this option.

Note: I know few of the products where ‘Supplemental Log Data Subset Database Replication’ doesn’t work or the product doesn’t support it, i.e. HVR 6

SQL> select BANNER_FULL from v$version;

BANNER_FULL
--------------------------------------------------------------------------------
Oracle Database 19c Enterprise Edition Release 19.0.0.0.0 - Production
Version 19.3.0.0.0


SQL> SELECT  FORCE_LOGGING, supplemental_log_data_min, supplemental_log_data_sr from v$database;

FORCE_LOGGING                           SUPPLEMENTAL_LOG_DATA_MIN                                    SUPPLEMENTAL_LOG_DATA_SR
--------------------------------------- ------------------------------------------------------------ ----------------------------------------
YES                                     YES                                                          NO


SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA SUBSET DATABASE REPLICATION;

Database altered.

SQL> SELECT  FORCE_LOGGING, supplemental_log_data_min, supplemental_log_data_sr from v$database;

FORCE_LOGGING                           SUPPLEMENTAL_LOG_DATA_MIN                                    SUPPLEMENTAL_LOG_DATA_SR
--------------------------------------- ------------------------------------------------------------ ----------------------------------------
YES                                     YES                                                          YES

You can disable it anytime using below mentioned steps/commands.

SQL>
SQL> ALTER DATABASE ADD SUPPLEMENTAL LOG DATA;

Database altered.

SQL>  ALTER DATABASE DROP SUPPLEMENTAL LOG DATA SUBSET DATABASE REPLICATION;

Database altered.

SQL> SELECT  FORCE_LOGGING, supplemental_log_data_min, supplemental_log_data_sr from v$database;

FORCE_LOGGING                           SUPPLEMENTAL_LOG_DATA_MIN                                    SUPPLEMENTAL_LOG_DATA_SR
--------------------------------------- ------------------------------------------------------------ ----------------------------------------
YES                                     YES                                                          NO

Hope It Helps!
Prashant Dixit

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repmgr failover done, but where is my Standby ?

Posted by FatDBA on December 15, 2020

Hey Guys,

Last weekend I’ve got a call from one of my friend asking about a weird issue in his master-slave (primary-standby) setup where he’s using repmgr for automatic failover and switchover operations. He said after the failover (server crashed) with role reversal or promotion the old standby becomes new primary (expected, all good till here), but as soon as the old primary comes back online and rejoins the configuration, it started as a primary too. I mean you can imagine something like below, both of the two hosts becomes master and there is no sign of a new standby.


[postgresdb@fatdba ~]$ repmgr -f /etc/repmgr.conf cluster show

 ID | Name  | Role    | Status    | Upstream | Location | Connection string
----+-------+---------+-----------+----------+----------+-----------------------------------------
 1  | node1 | primary | * running |          | default  | host=db_node1 dbname=repmgr user=repmgr
 2  | node2 | primary |   running |          | default  | host=db_node2 dbname=repmgr user=repmgr
 

He checked repmgr logs on the standby node and everything looks okay, standby promotion was sucessfull. It seems something was stopping the repmgr to update the information and bring that crashed node (previous primary) back as a standby. So the final situation is there are two primary nodes at this point.

So, how to and where to start from ?
A quick solution to this problem is to create an UPDATE TRIGGER on one of the internal table EVENTS of repmgr database (it creates its own database with default name of repmgr). The logic of creating a trigger is to handle events “standby_promote”, I mean when it happens a script is triggered that will bring back the old primary as new standby.

Next we would be needing a script that will help to automate the standby promotion. For that purpose you can use this script (link) or you can write something similar. And now when we have to call a bash script or to write stored procedures in a shell, we need the ‘.plsh’ extension in the database. Let’s install one of the most popular extension to do that, petere/plsh (link)


[postgresdb@fatdba ~]$ cd /usr/share/postgresql/12/extension/
[postgresdb@fatdba ~]$ sudo git clone https://github.com/petere/plsh.git
[postgresdb@fatdba ~]$ cd plsh
[postgresdb@fatdba ~]$ sudo make PG_CONFIG=/usr/bin/pg_config
[postgresdb@fatdba ~]$ sudo apt-get install make
[postgresdb@fatdba ~]$ sudo apt-get install gcc
[postgresdb@fatdba ~]$ sudo apt-get install postgresql-server-dev-12
[postgresdb@fatdba ~]$ sudo make install PG_CONFIG=/usr/bin/pg_config
 

Now, next create the extension in the database.


[postgresdb@fatdba ~]$ psql -U repmgr
 

This one needs to be executed only n primary side.


repmgr=# create extension plsh;
 

Now, let’s create the function and a trigger to invoke the script failover_promote.sh


[postgresdb@fatdba ~]$ psql
postgres=# CREATE FUNCTION failover_promote() RETURNS trigger AS $$
#!/bin/sh
/bin/bash /tmp/psqlscripts/failover_promote.sh $1 $2
$$
LANGUAGE plsh;
 

And the UPDATE TRIGGER on EVENTS table to call function created above.


postgres=#  create trigger failover
after insert
on events
for each row
execute procedure failover_promote();
 

Yes, that’s it. All done!
Now you can mimic the failover scenario i.e by stopping the primary database and check repmgr logs on the standby server.
You will see the standby is promoted and becomes new primary and as soon it’s finished, it will start pinging the crashed node and the moment it is back it will be promoted as a new standby.

Hope It helped!
Prashant Dixit

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