Adam Leszczyński

Oracle GoldenGate Parallel Integrated Replicat – DML rearrangement in transactions

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While preparing my presentation for POUG 2018 conference I have found some different behavior in Parallel Intgrated Replicat. This is a new Replicat type available from version 12.3. According to Oracle internal tests Parallel Replicat can be up to 5 times faster than Integrated Replicat in the same test case. I have done a number […]

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Oracle GoldenGate data filtering with WHERE and FILTER parameters the right way

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One of the most trivial tasks for data replication is to define a replica of the table with just a subset of the rows from the source table. For example we would like just to replicate the ACCOUNTS table with some type (one column has some defined value). If you want to replicate that using

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Oracle GoldenGate point in time source database recovery

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Even though you would like to secure the database from any disaster with HA, still it might happen that the database gets corrupted and a recovery from backup is needed to recover the database. In a critical scenario you might need to use Point In Time Recovery (PITR). Let’s focus on a scenario when the

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Oracle GoldenGate Coordinated Replicat unsynchronized mode troubleshooting

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According to the Oracle GoldenGate Coordinated Replicat documentation if the Replicat is stopped in an unclean manner the threads may be unsynchronized. Different threads may reach different checkpoint positions. Let’s find out what what might be the consequences of this situation.

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Oracle GoldenGate Coordinated Replicat – is it a fully transactional replication?

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Oracle GoldenGate till version 11.2 could only work serially. The only way of creating parallel replication and speeding up the apply process was to create multiple Replicat processes. In version 12.1 there was a new option available: the Coordinated Replicat. It is often misunderstood as a way of speeding up transactional replication. But … is

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Oracle GoldenGate Replicat Checkpoint table

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In one of my previous posts I have described the rationale for using a checkpoint table in the Replicat process. This is a summary of all possible combinations of Replicat process and which of them are able of (not) using checkpoint table.

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Oracle GoldenGate Integrated Replicat and NOSCHEDULINGCOLS

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According to the documentation it is not allowed to use NOSCHEDULINGCOLS with ADD TRANDATA when you would use Integrated Replicat. Why would Oracle care for that? Let’s find out what can happen if you don’t apply the rules.

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Oracle GoldenGate Classic Replicat checkpointing

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One of the key aspects for replication is checkpointing. A target database checkpoint tells which transactions are actually committed and which not yet. This is a key aspect of transactional replication. Let’s look how that works for the Oracle GoldenGate Classic Replicat.

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Oracle GoldenGate remote Classic Extract

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Most people I have spoken to are are absolutely convinced that the Extract process has to be running on the source database host. This thinking comes from all Oracle diagrams where the Extract process is located on the source database host. Till OGG version 11.1.1 this was indeed true. Some have heard that the Extract

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How Oracle GoldenGate Replicat handles Foreign Key Constraints

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According to the Oracle database documentation there are two types of constraints: DEFERRED and NOT DEFERRED. The first one can be evaluated at the and of the transaction, and the second one if validated immediately. On the other hand Oracle GoldenGate can handle the replication when the target uses both of them. Let’s find out

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