TMF Introduction (G06.26+)

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Application Performance

HP NonStop TMF Introduction—522414-002

4-4

Writes to Database Files

Figure 4-3. Unbuffered and Buffered Input/Output

Time

12345

Time

U, U, U, U

RW

Many

Transactions

Buffered I/O

12345

WRWRWRW

Unbuffered I/O

R

U

W

Read data from disk and put into cache

Update data in cache

Write data to disk

Legend

R

U

One

Transaction

U

One

Transaction

U

One

Transaction

U

One

Transaction

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