Answer / venu

There are 4 Tiers:
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The platform for SAS BABIEBI consists of multiple-tier environment, that is
1. Server Tier
2. Middle Tier (is known as Web Tier)
3. Client Tier and
4. Data Tier

The (4 Tiers) servers and applications are rely on a common, integrated Metadata Environment.

Server Tier: OLAP Server, Object Spawner, Workspace Server, Pooled Workspace Server, Stored Process Server etc.

MiddleWeb Tier: WRS, Dashboard, Portal, Stored Process Web App. etc. (Web Applications, URL based)

Client Tier: AMO, EG, OLAPCube Studio, InfoMap Studio, DI, SMC etc. (Client Applications)

Data Tier: SAS Datasets, OLAPCubes, RDBMS Table, SPD Files, ERP etc.

Answer / varun

there are one tier, two tier, three tier, four tier architecture
0NE TIER :stand alone server (all info in one server, our pc)
TWO TIER : client tier, server tier(web tier, data tier)
THREE TIER : client tier, web tier, server tier(data tier) most of companies use this.
FOUR TIER : client tier, web tier, server tier, data tier.

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