πŸ’ PostgreSQL: Documentation: Logical Decoding Examples

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postgres=# SELECT * FROM pg_create_logical_replication_slot('my_slot', '​test_decoding');. slot_name | lsn. + my_slot | 0/.


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each read. postgres=# SELECT * from pg_create_logical_replication_slot('​my_slot1', 'test_decoding'); slot_name | xlog_position.


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2ndQuadrant The SQL Interface: postgres=# SELECT * FROM pg_create_logical_replication_slot. 'my_stream', 'test_decoding'); slotname | xlog_position.


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pg_create_logical_replication_slot(slot_name name, plugin name), (slot_name name, xlog_position pg_lsn), Creates a new logical (decoding) replication slot.


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postgres=# SELECT * FROM pg_create_logical_replication_slot('regression_slot'​, 'test_decoding'); slot_name | lsn +


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2ndQuadrant The SQL Interface: postgres=# SELECT * FROM pg_create_logical_replication_slot. 'my_stream', 'test_decoding'); slotname | xlog_position.


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select pg_create_logical_replication_slot('my_slot', 'pgoutput');. Or you create the replication slot using the replication protocol.


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pg_create_logical_replication_slot('my_slot', 'wal2json');. And either connect to it using pg_recvlogical or making special SQL queries. This.


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1. select pg_create_logical_replication_slot('my_logical_slot', 'pgoutput'). – pgoutput is name of plugin used for logical replication. it is better to.


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SELECT * FROM changes; -- Changeset Extraction

The process of logical2sql is described in the diagram below :. The ReorderBufferChange will be set into recordbuffer by their TransactionID, as one TransactionID is committed, the ReorderBufferChange in recordbuffer related to the transaction will be analyzed by the pointed plugin. SQL from the new output plugin to the new tool will also have some efficiency loss. I believe you are not familiar with this process. This paper mainly explains the principle instead of going into many functional demonstrations. Logical Replication Schematics Concepts About Recognize Logical A picture to known every things about logical Logical Decoding is the key technology of all logical replication feature. Send to Email Address. In the logical2sql idea mapI we can see that the SQL is formed in the new output plugin and then sent to the new tool , the SQL forwarding is done by the new tool.

These words puzzle me so much so I decided to start the blog with explaining these click the following article and describing the relationships between them.

Save my name, email, and website in this browser for the next time I comment. Insert Logical Replication Schematics 5. Here is simple Logical Replication progress, I will show what Postgres do with every step. We can then build a new tool which will receive the SQL and forward to other databases instead of writing down to the temporary file.

Search for:. Now we have completed a simple demo of the function of logical replication. Replication Or Physical Replication is a more ancient or traditional data synchronize approach.

You can use publish option to point more detail publication information insert,delete,update. Your email address will not be published. The detailed analysis below will help in understanding this :.

The Logical Replication makes us use logical replicate with a build-in feature of Postgres. At the same time because there is no intermediate file, there is no need to worry about the problem of escape characters. The pg_create_logical_replication_slot almost has the same feature as built-in Logical Replication with different operational steps however we can use pglogical for a low version of Postgres while Logical Replication can support from pg The walsender process continue receiving wal record from replicate slotthe wal records will be filtered and sent to ReorderBufferChange It is mainly oldtuple and newtuple for DML records.

Pg_create_logical_replication_slot is Walminer which can analyze history wal file to SQL. Also, walsend and logical replication work processes are created for logical replication services in IP43 and IP89, respectively. We can even abandon new tool to directly implement SQL forwarding in the plugin.

Hello Now he has joined the HighGo community team and hopes to make more contributions to the community pg_create_logical_replication_slot the future.

Email contact highgo. We can use the plugin in two ways as below, you can check it in the document. The pgoutput plugin will then do a filter and data reorganization to the Pg_create_logical_replication_slot and send it to subscription.

Leave a Reply Cancel reply Your email address will not be published. Pglogical can support pg 9. Physical Replication Schematics Logical Replication support table-level data synchronization, in princial it is very different from physical replication.

The New Concept: logical2sql 1. Secondly, it will cause a problem with the escape character. Logical Decoding is the key technology of all logical replication feature.

Movead Li. It plays an important role in the data synchronization of Postgres. There was also a data transfer in the process of SQL from the new output plugin to the new tool. Your Email Address.

Notice that Physical Replication will copy data from wal record to data pages while Logical Replication will execute an insert, update, delete again in the subscription. Li is kernel development of Highgo Software. The principle of convective replication has been described in detail in the previous section Difference Between Physical And Logical Replication below is a miniature of this simple insert statement in Logical Replication Schematics. Logical Replication support table-level data synchronization, in princial it is very different from physical replication. If we can combine the two tools, we can solve the problem by avoiding the loss of transmission efficiency of read and write data. Your Name. Base on the experience Movead has two open-source software on the Postgres database. It copies data in the WAL record by using exact block addresses and byte-by-byte replication. Now he has joined the HighGo community team and hopes to make more contributions to the community in the future.