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Evolution of storage 

To reiterate, RDBMS technology was developed primarily to address business data which is 

transactional and record oriented. Event data is different than relational data. RDBMS technology is 

unable to adequately address the unique characteristics of event data, and attempts to force an 

RDBMS solution on event data management often create significantly diminished performance and 
increased storage requirements. Strategies aimed at smoothing over the wrinkles simply produce even 

more issues.  
There is a clear need for an event storage technology that overcomes RDBMS shortfalls and leverages 

the unique characteristics of event data. This technology is not intended to compete across the board 
with RDBMS technology, but instead follows recent trends of purpose-built storage solutions. As such, 

it reflects the advantages of the third-generation storage-systems technology. 

First generation: Direct attached storage 
First generation architectures—direct attached storage (DAS)—consisted of a hard disk attached directly to 

a computer, with storage controlled by a computer’s CPU. Today, greater that 95 percent of all computer 
storage devices (disk drives, disk arrays, and RAID systems) are directly attached to a computer through 

various adapters—through standardized software protocols such as SCSI, Fiber Channel, and others. This 

type of storage is alternatively called ‘captive storage’ or ‘server attached storage’. 

Second generation: Storage architectures 
As architectures evolved, new ones began utilizing a combination of computers, networks, and DAS 

that essentially provide virtual DAS for client computers. 

Third generation: Data-type-specific storage architectures 
Third generation storage architectures are similar to generic data storage architectures, but are specifically 

designed to manage the unique characteristics of the type of data stored, such as event data. 

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