Db2 Version 12 Stuff - neodbug• Db2 12, plus Function Level 503 activated), plus APAR PH02878 •...

© 9/12/2019 BMC Software, Inc. 1© 9/12/2019 BMC Software, Inc.

Bill Moran

Db2 Version 12 Stuff

© 9/12/2019 BMC Software, Inc. 2

• Release Objectives- Continuous enhancement- Add features requested from Db2 customers- Continuous delivery – more later

• Release Timeline

Db2V12 Product Release

3/4/16

IBM BETA Db2 V12

Db2 V12.1 – GA10/16

SPE’s and PTF’s2017



More SPE’s and PTF’s

Db2 V11.1 – End of Service

9/20


—

Db2 12What Was New – a brief look


Sowhat

was new with

Db2 12?✓ Performance

Management

✓ Performance

✓ Changes for Applications

Perf

orm

ance

Man

agem

ent ✓ Security

✓ Utilities

Ad

min

istr

atio

n

✓ Availability

✓ Scalability

How do we get there?

✓ Continuous Delivery


Performance

Better Use of Storage

✓ Contiguous bufferpools✓ Improvement on

PGSTEAL NONE✓ Automatic overflow area✓ Save up to 8% CPU

In-Memory Indexes

✓ Index “Fast Traverse Block”✓ Faster traversal of index

pages✓ Storage area separate from

bufferpools✓Usage managed by Db2

✓ -DISPLAY STATS✓ IFCIDs 389 and 477✓ Exclude indexes if needed

✓ SYSINDEXCONTROL catalog table

✓ “Up to 23% CPU reduction” for index lookup✓ From IBM material

✓ Insert Algorithm 2✓Up to 20% CPU reduction✓Over 1 million inserts per

second

New Insert Algorithm

As always, “the new Db2 performs better than the old one”


Performance Overview – OLTP & Query *

OLTP✓ 2%-3% CPU reduction✓ 5%-10% increase with

Index FTB✓ Contiguous bufferpools

can improve this further

Query✓ 0-20% CPU reduction with

older access paths✓ 10%-40% reduction with new

access paths✓ 90% CPU reduction is possible

* Data from IBM Material


Dynamic SQL StabilityAdvanced Plan Management & Predictable Performance

• Bring advantages of Static SQL bind to dynamic SQL

• Allows dynamic SQL access paths to be retained in the catalog

• Can explain and free stabilized plans

• New SQL matched against stabilized plans before prepare/execute

• Access path can be read into cache from catalog


RUNSTATS ImprovementsMainly around Profiles

• Inline stats now support RUNSTATS profiles

• Optimizer can automatically update profiles

• Statement cache invalidations

• CLUSTERRATIO calculation “improvements”


• NEW! UTS PBR RPN– Relative Page Number

• Pages are numbered per partition

• Eliminates inverse relationship between number of partitions and individual partition size

• 7 byte RID (2 for partition, 5 for page number)

• Start of partition level attributes

Partition LimitsRoom for further growth


Insert Partition Index Compression

Online Schema Enhancements

Pending Altersfrom Immediate

More “DROP Avoidance”


Security Changes

• Transfer of ownership

• Installation/Migration without SYSDADM

• Unload privilege

• Long and CaMeL based DBRM names


Migration Requirements• Continuous Delivery Changes Single Phase Migration

Requirements✓ DFSMS v2.1✓ z/OS v2.1+✓ RACF v2.1✓ Db2 11 NFM✓ z196 machine or higher

Pre-Requisites✓ Db2 11 with fallback SPEs✓ BSDS supporting 10-byte RBAs✓ No pre Db2 10 bound packages✓ Basic row format is deprecated


Continuous Delivery

• IBM will deliver future changes in the maintenance stream- Much more aggressively than they have

in the past

• They will maintain “continuous production level reliability”

• Customers will not have to go through (as many) function upgrades

• RSU’s will be the same• This started after Db2 12 GA• This is IBM wide

- But Db2, IMS, CICS, MQ, and z/OS are all doing it differently


Continuous DeliveryFunction Levels

• “BNFA” (“CM” ) is now “function level 100” (FL100 or M100)

• Activate function level 500 (V12R1M500) to get new Db2 12 function

– Was “ANFA” aka “NFM”

• Activate function level (V12R1Mnnn) to get newer functions as appropriate

• Display group will tell us where we are and where we have been.

• Test option for activate

• Can (un)activate backwards


Continuous DeliveryFunction Levels

Db2 11

Db2 12


New Db2 12 Function Levels

•FL501 Onwards


The Function Levels after FL500

• FL501 (May 2017)• LISTAGG function

• FL502 (May 2018)• Encryption KEY LABEL

support in DDL• Explicit numeric casting

• FL503 (Oct 2018)• Support for Db2 AI• Temporal replication• Temporal auditing• Level change messaging

• FL504 (April 2019)• Huffman Compression• Deprecated Objects• Pass Through Functions• New SQL Alternatives

https://www.ibm.com/support/knowledgecenter/en/SSEPEK_12.0.0/wnew/src/tpc/db2z_db2functionlevels.html

• FL505 (June 2019)

• Rebind Phase-In

• Encryption Functions

• DECFLOAT Extensions

• RUNSTATS Page Sampling

• Temporal/Archive Transparency



The Function Levels after FL500

• “Roughly 4-monthly” delivery

• FL505 AND FL506 this year?

• Each delivering multiple functions/capabilities

• See https://www.ibm.com/support/knowledgecenter/en/SSEPEK_12.0.0/wnew/src/tpc/db2z_db2functionlevels.html



FL501 - LISTAGG

• Produces a list of all values in a group

• Optional separator argument can be provided

• Ordering can also be specified for the items within the group

20


FL503 – Support for Db2 AI

“IBM Db2 AI for z/OS leverages machine learning technology to empower the Db2 for z/OS optimizer to determine the best-performing query access paths, based on your workload”

21


Db2 AI – Pre-requisites

In addition to the hardware requirements specified for Machine Learning for z/OS• An additional 1 GB memory and available capacity

on the zIIP processors on the LPAR where Db2 12 is running

• z/OS 2.1 or later, with the Product Registration Services component

• Db2 12, plus Function Level 503 activated), plus APAR PH02878

• Machine Learning for z/OS, V1.2.0, plus APARs PI99400, PI99401 and PH02006

• Linux package 1.2.0.1 (separate packages are provided for x86-64 and Linux on Z)

22


Db2 AI – Other Thoughts

• This seems to be a non-trivial series of steps• Did you see that “… can easily consume all available resources on

the host z/OS system” statement?• Db2 AI is also a chargeable extra component

- How to cost-justify the expense- Who pays for the benefit this may bring?

• IBM development has SQL script to identify SQL statements with risk of a sub-optimal access path

23


FL503 – Temporal Auditing

• System Temporal historical queries COULD return incomplete data• Due to NULL values in the audit DATA CHANGE OPERATION column• Queries about the past would exclude these nulls• FL503 fixes this anomaly

24


FL503 – Temporal Replication

• A new built-in global variable, SYSIBMADM.REPLICATION_OVERRIDE• Default is “N”

• Applications not allowed to specify values for row-begin, row-end, transaction-start-ID, and generated expression

• Temporal history for system temporal data is enabled

• Alternate “Y”• Applications are allowed to specify values for row-begin, row-end, transaction-start-ID, and

generated expression• Temporal history for a system temporal data is disabled

• “Y” allows replication of temporal data, as if it were regular Db2 data• Intended for use by replication tools

• “… not intended for general use”

25


FL503 – CL/FL Messaging

• New console message DSNG014I• Issued whenever the function level or catalog level changes• DSNG014I member-name

DB2 NEW CATALOG|FUNCTION LEVEL (new-level)

DB2 CATALOG LEVEL (catalog-level)

CURRENT FUNCTION LEVEL (activated-level)

• Remember the SYSIBM.SYSLEVELUPDATES catalog table has the full story

26


FL504 – Huffman Compression

• Compression of Db2 data with hardware-based encoding (Huffman)With the IBM z14™ Compression Coprocessor (CMPSC)

• More efficient and greater compression

• Only available for universal table spaces

27


FL504 – Prevent creation of deprecated objects

• SQL statement in packages that are bound with APPLCOMPAT(V12R1M504) or higher, or with comparable SQL options in effect, are prevented from creating deprecated objects:

• Synonyms• Segmented or Classic Partitioned tablespaces

• SIMPLE tablespaces already blocked from creation

• Hash tables

• SET CURRENT APPLICATION COMPATIBILITY = V12R1M503 in an emergency

• But please take the hint

28


FL504 – New SQL alternatives for special registers and NULL predicates

• New syntax alternatives to simplify porting of applications from other platforms

• For example, support is introduced in Db2 for z/OS for the following alternative syntax for referencing existing special registers

29


FL505 – Rebind Phase-In

• Rebind a package concurrently with execution of the package• When rebind finishes, new threads use the new package copy immediately

• Existing threads continue to use the prior copy (the phased-out copy)• New threads immediately use the new copy (the phased-in copy)• Also enables switching to previous access paths and runtime structures

gradually• Switch to the previous access path is phased-in• Allowing regression recovery without incurring an application outage

30


FL505 – Encryption/Decryption Functions

• New built-in encrypt and decrypt data key functions• ENCRYPT_DATAKEY converts a block of plain text to a block of encrypted

text using a specified algorithm and key label• DECRYPT_DATAKEY functions return the block of encrypted text from

ENCRYPT_DATAKEY as a block of the datatype specified by the function used

31


FL505 – More Support for DECFLOAT

• Improved support for DECFLOAT datatype columns• Improved performance of mission critical applications• DECFLOAT columns can be specified

• In an index• As part of a primary or unique key

32


FL505 – RUNSTATS Auto Page Sampling

• Changes the default meaning of the STATPGSAMP subsystem parameter• Now means the same as YES• RUNSTATS uses page-level sampling by default for universal table

spaces• In function level 504 and lower, the default meaning is NO

• RUNSTATS does not use page sampling by default• Sampling is determined by the options that the RUNSTATS statement

specifies

33


FL505 – Temporal and Archive Transparency

• System-period temporal tables and archive-enabled tables can be referenced in WHEN clauses of both basic and advanced triggers

• Regardless of the settings of the SYSTIMESENSITIVE and ARCHIVESENSITIVE bind options

• Time machine and transparent archive data retrieval are fully supported in the WHEN clause

34


•https://www.ibm.com/support/knowledgecenter/SSEPEK_12.0.0/wnew/src/tpc/db2z_12_wnew.html

Lists ALL of the changes, OTHER than Function Levels, to Db2 12

https://www.ibm.com/support/knowledgecenter/SSEPEK_12.0.0/wnew/src/tpc/db2z_12_wnew.html


What Next?


The Future

• Who knows?

• Function delivery is accelerating

• 1 in 2017

• 2 in 2018

• 2 so far in 2019

• And delivering more functionality in each function level


The Future

• Performance and Administration of “worlds best server”

• Some preparation for future changes

• Continued relaxation of limits

• Even more growth?

• Continuous Delivery ….

• Allied items, like “IDAA on z”


Thank You

Any More Questions ?

Db2 Version 12 Stuff - neodbug• Db2 12, plus Function Level 503 activated), plus APAR PH02878 •...

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