Post by account_disabled on Mar 4, 2024 7:32:14 GMT
Replication for multi-node infrastructures Replication is several seconds slower than Always On and Mirroring. This slowdown is affected by the very principle on which replication works. Logs are first read, changes are subsequently written to the distribution database and only then to the subscriber. However, the fundamental difference arises from the properties of the secondary node – in this context, the subscriber.While Always On and Mirroring can only copy data to the secondary nodes and any other operations are not available, in the case of replication, writing is also possible.
This feature is sometimes referred to as " writable secondary " and is USA Phone Number List critical for load distribution needs . It enables reading and writing at the level of secondary databases (subscribers) that can communicate with each other . At the same time, replication is the only method that can only work with a certain part of the data , not the entire database. Data recovery using Log Shipping Log Shipping is an easily configurable method for disaster recovery purposes. It is not limited by distance from the primary target , nor does it have requirements for matching SQL versions. It is a proven technology offering a wide range of settings.
![](https://static.wixstatic.com/media/ad8ebf_34528caafecd4a4d847027539955825b~mv2.png/v1/fill/w_490,h_295,al_c,lg_1,q_85,enc_auto/ad8ebf_34528caafecd4a4d847027539955825b~mv2.png)
For multi-node infrastructures, it is offered to combine Log Shipping with the support a higher number of target locations. Technology comparison Technology Always On Replication Log Shipping Instant data Primary node Primary node Publications Primary node Data copy delay By network, milliseconds By network, milliseconds At least - seconds, it can be many times more + minutes, depending on configuration The possibility of working only with part of the data No No Yes No Writing to the secondary node No No Yes No Deployment across SQL versions No No Yes Yes aspects to consider when choosing technology.
This feature is sometimes referred to as " writable secondary " and is USA Phone Number List critical for load distribution needs . It enables reading and writing at the level of secondary databases (subscribers) that can communicate with each other . At the same time, replication is the only method that can only work with a certain part of the data , not the entire database. Data recovery using Log Shipping Log Shipping is an easily configurable method for disaster recovery purposes. It is not limited by distance from the primary target , nor does it have requirements for matching SQL versions. It is a proven technology offering a wide range of settings.
![](https://static.wixstatic.com/media/ad8ebf_34528caafecd4a4d847027539955825b~mv2.png/v1/fill/w_490,h_295,al_c,lg_1,q_85,enc_auto/ad8ebf_34528caafecd4a4d847027539955825b~mv2.png)
For multi-node infrastructures, it is offered to combine Log Shipping with the support a higher number of target locations. Technology comparison Technology Always On Replication Log Shipping Instant data Primary node Primary node Publications Primary node Data copy delay By network, milliseconds By network, milliseconds At least - seconds, it can be many times more + minutes, depending on configuration The possibility of working only with part of the data No No Yes No Writing to the secondary node No No Yes No Deployment across SQL versions No No Yes Yes aspects to consider when choosing technology.