In today’s business world, consistent access to real-time, online transactional data is a competitive advantage. To realize this advantage, this data must be current and available from anywhere at all times. Otherwise, the inability to access or update, or the loss of this data carries a significant potential business cost: up to thousands of dollars per second (Figure 1 and Table 1), loss of brand reputation, regulatory fines, and other unforeseen consequences.
(Source: Network Computing, the Meta Group, Contingency Planning Research.)
In some cases, absolutely no data loss can be tolerated:
|Technology Architecture||Recovery Point Objective||Retail||Credit/Debit Card||EFT||Stock Trade|
|Active/Passive and Sizzling-Hot-Takeover||~ 1 sec||$47.5K||$35.6K||$688K||$31.6M|
|Active/Active||~ 0.5 sec||$23.8K||$17.8K||$344K||$15.8M|
|1Example assumes rate of 500 transactions per second|
2Retail average transaction ~ $95 (US Online) (Source: Monetate)
3Credit/Debit Card Average Transaction ~ $71 (UK) (Source: European Central Bank)
4EFT average transaction ~ $1,376 (Source: Canadian Payments Association)
5Stock trade average transaction ~ $63,284 (Source: London Stock Exchange)
Most other data replication software uses asynchronous replication that leads to the possibility of data loss for unplanned outages. For this reason, companies must consider a zero data loss solution to protect their invaluable data. Shadowbase ZDL guarantees that all committed data changes made on one system are replicated to a backup system. Therefore, unplanned system outages never result in lost data, and the business will never face these costs or the headache of trying to recover lost data.
Shadowbase ZDL uses synchronous replication, which eliminates all possibility of data loss, as explained in these definitions:
Shadowbase ZDL avoids data loss for active/passive architectures. Shadowbase ZDL support for active/active architectures, called Shadowbase ZDL+, is forthcoming in a future release.
Shadowbase ZDL+ Automatically Resolves Data Collisions
In active/active architectures, data collisions can occur when using asynchronous replication. By their very nature, active/active architectures run multiple application copies, with each application maintaining its own database copy. If two requests are routed to different application environments for processing, and they both act on the same account’s data, different values may result in each database. This result is referred to as a data collision. Data collisions cannot arise when using synchronous replication because the replication engine automatically resolves them. (This feature will be forthcoming in a future release, Shadowbase ZDL+.)
Table 2 compares the benefits of synchronous replication (Shadowbase ZDL and Shadowbase ZDL+) to asynchronous replication.
|Attribute||Asynchronous Active/Passive||Synchronous Active/Passive||Asynchronous Sizzling-Hot-Takeover||Synchronous Sizzling-Hot-Takeover||Asynchronous Active/Active||Synchronous Active/Active|
|Data Collisions||Not possible||Not possible||Not possible||Not possible||Possible||Not possible|
|Data/Request Partitioning||Not required2||Not required2||Not required||Not required||Possible||Not Possible|
|1All users affected, but takeover time is the same as Active/Active modes|
2"Required" if run in Reciprocal Mode (Reciprocal Mode allows each system to be active for a separate data set)
3"Yes" if run in Reciprocal Mode
Use Shadowbase ZDL and Shadowbase ZDL+ to significantly reduce outage costs by avoiding any data loss, eliminating data collisions, and applying active/active architecture benefits to any application. Shadowbase ZDL and Shadowbase ZDL+ are the pinnacle of replication solutions for business continuity and data integration, providing the ultimate protection level against unplanned service outage costs. Shadowbase ZDL is available now for active/passive architectures, and Shadowbase ZDL+ will be available in a future release.