BP4

TOTAL

---------------------

--------

BPOOL HIT RATIO (%)

50

GETPAGES

300350

BUFFER UPDATES

0

SYNCHRONOUS WRITE

0

SYNCHRONOUS READ

754

SEQ. PREFETCH REQS

702

LIST PREFETCH REQS

0

DYN. PREFETCH REQS

3944

PAGES READ ASYNCHR.

148634

HPOOL WRITES

0

HPOOL WRITES-FAILED

0

PAGES READ ASYN-HPOOL

0

HPOOL READS

0

HPOOL READS-FAILED

0

Figure 44. DB2 PM Accounting, Buffer Pool Section

11.1.1.2 I/O Suspensions

If accounting trace class 3 is activated, the DB2 accounting reports show a summary of the wait times of a DB2 application. This summary shows when the DB2 application is suspended (waiting) for a DB2 system task to complete. These suspensions include the waits for I/O operations.

Figure 64 on page 145 shows an example of class 3 suspend times. The values shown for A, B, C are total elapsed times for I/O and the number of occurrences of each type of I/O (events).

A: SYNCHRON. I/O

The total elapsed time due to synchronous I/O

 

and the total number of synchronous I/O

 

suspensions.

B: OTHER READ I/O

The total waiting time due to asynchronous

 

read I/O and the total number of suspensions

 

due to asynchronous read I/O.

C: OTHER WRTE I/O

The total elapsed time due to asynchronous

 

write I/O and the total number of

 

asynchronous write I/O suspensions.

Note: Another example of other write I/O is the case in which a transaction is waiting because the page that the transaction wants to update is currently being written out by a write engine. In this case, the wait time is captured in other write I/O.

Note: Wait time for force at commit time is included in SYNC I/O WAIT with V5 and LOG FORCE WRITE WAIT with V6.

11.1.2Statistics I/O Information

11.1.2.1Data I/O Operations

The statistics report provides detailed information on I/O operations for each buffer pool at the DB2 susbsystem level. This means that this report summarizes the information of all applications executing during the interval that statistics are gathered. The information provided is much more detailed than the information in

I/O Performance and Monitoring Tools

121

Page 143
Image 143
IBM 5695-DF1, 5655-DB2 manual Statistics I/O Information, 11.1.1.2 I/O Suspensions, Data I/O Operations, 121

5695-DF1, 5655-DB2 specifications

IBM 5655-DB2 and 5695-DF1 are significant components within the IBM software ecosystem, predominantly focusing on data management and integration solutions. These offerings cater primarily to enterprise environments that require robust database management systems and associated frameworks to maintain and manipulate data efficiently.

IBM 5655-DB2 is a well-known relational database management system (RDBMS) that excels in managing large volumes of structured data. Its architecture is designed to support high availability, scalability, and performance, crucial for businesses operating in today’s data-driven world. Some of its main features include advanced indexing capabilities, support for complex queries, and dynamic workload management. Additionally, it provides strong concurrency controls, which enable multiple users to access and manipulate data simultaneously without compromising data integrity.

One of the key characteristics of DB2 is its support for various data types, including JSON and XML, making it versatile for modern applications that generate data in diverse formats. It also features robust security mechanisms to protect sensitive data, aligning with compliance standards across industries. Integration with analytics tools further allows businesses to derive insights from their data, enhancing decision-making processes.

On the other hand, IBM 5695-DF1, also known as the InfoSphere DataStage, is a powerful data integration tool that facilitates the extraction, transformation, and loading (ETL) of data from various sources to target systems. It empowers organizations to streamline their data flows, ensuring that clean, consistent information is available for analysis and operational use. Key features of 5695-DF1 include a user-friendly graphical interface that enhances developer productivity and a rich set of connectors for numerous data sources, enabling seamless data integration.

DataStage also supports real-time data integration, allowing businesses to keep their data synchronized across multiple platforms. Its parallel processing capabilities dedicatedly optimize performance, enabling organizations to handle vast datasets efficiently. It incorporates data quality tools that help in validating and cleansing data before it is used for decision-making processes.

Both IBM 5655-DB2 and 5695-DF1 are part of a broader strategy to accommodate the evolving landscape of data management. Businesses leverage these technologies to enhance their data architectures, fostering agility and competitive advantage in their respective markets. Their integration capabilities, along with a focus on security and scalability, position them as vital assets in modern enterprise environments. Whether managing critical data within a database or ensuring seamless data flow across systems, these IBM offerings provide a comprehensive approach to handling complex data challenges.