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stand-alone environments. However, the benefits of the logical n-layer architecture are still desirable in terms of maintainability and code reuse. It probably goes without saying that everything can be installed on a single client workstation. An optimal performance smart client is usually implemented using WPF or Windows Forms for the interface, with the business logic and data access code running in the same process and talking to a Microsoft SQL Server Express or a Microsoft SQL Server Compact Edition database. The fact that the system is deployed on a single physical tier doesn t compromise the logical architecture and separation, as shown in Figure 1-2.

6 from ( 7 select dbms_rowidrowid_block_number(deptrowid) dept_blk, 8 dbms_rowidrowid_block_number(emprowid) emp_blk, 9 deptdeptno 10 from emp, dept 11 where empdeptno = deptdeptno 12 ) 13 ) 14 where flag = '*' 15 order by deptno 16 / no rows selected That was exactly our goal to get every row in the EMP table stored on the same block as the corresponding DEPT row But what would have happened if we estimated incorrectly, what if 1024 was insufficient What if some of our departments were close to 1024 and others exceeded that value Then, obviously, the data could not fit on the same block and we d have to place some of the EMP records on a block separate from the DEPT record.

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We can see this easily by resetting our example above (I m starting with the tables as they were before the load above, right after creating them) When I load this time, we ll load every EMP record eight times, to multiply the number of employee records per each department: ops$tkyte%ORA11GR2> insert into dept 2 ( deptno, dname, loc ) 3 select deptno+r, dname, loc 4 from scottdept, 5 (select level r from dual connect by level < 10); 36 rows created ops$tkyte%ORA11GR2> insert into emp 2 (empno, ename, job, mgr, hiredate, sal, comm, deptno) 3 select rownum, ename, job, mgr, hiredate, sal, comm, deptno+r 4 from scottemp, 5 (select level r from dual connect by level < 10), 6 (select level r2 from dual connect by level < 8); 882 rows created ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> select min(count(*)), max(count(*)), avg(count(*)) 2 from dept 3 group by dbms_rowid.

Sparta vs. Athens (Determinism vs. Creative Chaos)

rowid_block_number(rowid) 4 / MIN(COUNT(*)) MAX(COUNT(*)) AVG(COUNT(*)) ------------- ------------- ------------1 7 6 So far, it looks just like the prior example, but when we compare the blocks the EMP records are on to the blocks the DEPT records are on.

Figure 1-2. The five logical layers running on a single machine It s important to remember that n-layer systems can run on a single machine in order to support the wide range of applications that require stand-alone machines. It s also worth pointing out that this is basically the same as a 2-tier, fat-client physical architecture; the only difference is that in a 2-tier physical architecture, the Data Storage and Management layer would be running on a central database server, such as SQL Server or Oracle, as shown in Figure 1-3.

ops$tkyte%ORA11GR2> select * 2 from ( 3 select dept_blk, emp_blk, 4 case when dept_blk <> emp_blk then '*' end flag, 5 deptno 6 from ( 7 select dbms_rowid.rowid_block_number(dept.rowid) dept_blk, 8 dbms_rowid.rowid_block_number(emp.rowid) emp_blk, 9 dept.deptno 10 from emp, dept 11 where emp.deptno = dept.deptno 12 ) 13 ) 14 where flag = '*' 15 order by deptno 16 / DEPT_BLK EMP_BLK F DEPTNO ---------- ---------- - ---------523 554 * 12 523 554 * 12 526 554 * 39 526 554 * 39 45 rows selected. we can see there are 45 out of 882 EMP rows on a block separate and distinct from the block their corresponding DEPTNO is on in the DEPT table. Given that we undersized the cluster (the SIZE parameter was too small given our real life data), we could recreate it with a cluster SIZE of 1200 and then we would discover ops$tkyte%ORA11GR2> select min(count(*)), max(count(*)), avg(count(*)) 2 from dept 3 group by dbms_rowid.rowid_block_number(rowid) 4 / MIN(COUNT(*)) MAX(COUNT(*)) AVG(COUNT(*)) ------------- ------------- ------------6 6 6 ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> select * 2 from ( 3 select dept_blk, emp_blk, 4 case when dept_blk <> emp_blk then '*' end flag, 5 deptno 6 from ( 7 select dbms_rowid.rowid_block_number(dept.rowid) dept_blk, 8 dbms_rowid.rowid_block_number(emp.rowid) emp_blk, 9 dept.deptno 10 from emp, dept 11 where emp.deptno = dept.deptno 12 )

13 14 15 16

Figure 1-3. The five logical layers with a separate database server Other than the location of the data storage, this is identical to the single-tier configuration, and typically the switch from single-tier to 2-tier revolves around little more than changing the database connection string.

) where flag = '*' order by deptno /

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