GLOBAL DDF ACTIVITY

QUANTITY

/MINUTE

/THREAD

/COMMIT

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

--------

-------

-------

-------

DBAT QUEUED-MAXIMUM ACTIVE

N/P

N/P

N/P

N/A

CONV.DEALLOC-MAX.CONNECTED

N/P

N/P

N/P

N/A

INACTIVE DBATS - CURRENTLY

N/P

N/A

N/A

N/A

INACTIVE DBATS - HWM

N/P

N/A

N/A

N/A

ACTIVE

DBATS - CURRENTLY

N/P

N/A

N/A

N/A

ACTIVE

DBATS - HWM

N/P

N/A

N/A

N/A

TOTAL

DBATS - HWM

N/P

N/A

N/A

N/A

COLD START CONNECTIONS

N/P

N/P

N/P

N/P

WARM START CONNECTIONS

N/P

N/P

N/P

N/P

RESYNCHRONIZATION ATTEMPTED

N/P

N/P

N/P

N/P

RESYNCHRONIZATION SUCCEEDED

N/P

N/P

N/P

N/P

Figure 61. DB2 PM Statistics, Global DDF Activity Section

12.1.2 Data Access

The next step of this analysis is the examination of the buffer pools to establish the pattern of data access. The accounting report shows that the following buffer pools are being used:

BP0

System table and index spaces

BP2

User table spaces

BP4

User index spaces

BP5

Work DB table spaces

BP0 contains little data which is all in the buffer pool; this buffer pool contains the DB2 Catalog and Directory. BP5 is another special case; it contains the work DB. Both BP2 and BP4 contain interesting data. The corresponding sections from the accounting report are in Figure 62 on page 144 and in Figure 63 on page 145.

The query accesses 5.8 million pages in BP2 (A) and 0.3 million pages in BP4 (F). No data is updated in either buffer pool.

In buffer pool BP2, 18796 pages (B) are read synchronously and 5.8 million pages (E) are read with prefetch operations. The prefetch operations are sequential prefetch (C) and dynamic prefetch (D). The total is 186060 prefetches that read 5795249 pages, an average of 31.15 pages per prefetch.

BP2

TOTAL

 

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

--------

 

BPOOL HIT RATIO (%)

0

 

GETPAGES

5835348

A

BUFFER UPDATES

0

 

SYNCHRONOUS WRITE

0

 

SYNCHRONOUS READ

18796

B

SEQ. PREFETCH REQS

163939

C

LIST PREFETCH REQS

0

 

DYN. PREFETCH REQS

22121

D

PAGES READ ASYNCHR.

5795249

E

Figure 62. DB2 PM Accounting, BP2 Section

144Storage Management with DB2 for OS/390

Page 166
Image 166
IBM 5655-DB2, 5695-DF1 manual Data Access, BP0, BP2, BP4, BP5

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.