dba course day 2

8/14/2019 DBA Course Day 2

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DBA TrainingDBA Training


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Day 2:Day 2:

x Session 1 : DB2 environment dependentUtilities, Restricted states of DB2objects, independent utilities


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DB2 utilities EnvironmentDB2 utilities Environment

x Batch Utilities:LOAD REPAIRREORG RUNSTATSCOPY STOSPACEMERGECOPY CHECK(IND/DATA)QUIESCE MODIFYREPORT RECOVER


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LOAD UtilityLOAD Utilityx Used to load data into one or more

tablesx Input:x LOAD DATA statement describing the

data to be loadedx File containing datax Output:x

Loaded table or partition


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LOAD UtilityLOAD Utilityx Features:

x Automatic data conversion betweencompatible data types

x Data loaded in the sequence presented;no sort invoked

x Indexes built; duplicates checked


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LOAD UtilityLOAD Utilityx Phase Flow:x UTILINITx RELOADx SORTx

BUILDx INDEXVALx ENFORCEx DISCARD


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LOAD Utility (Example)LOAD Utility (Example)LOAD DATA INDDN(SYSREC)RESUME YES

ENFORCE CONSTRAINTS

INTO TABLE TRGD55.PROJ

(PROJNO POSITION(1) CHAR(6),

PROJNAME POSITION(8) VARCHAR,

DEPTNO POSITION(33) CHAR(3))

Data File contains : 31 8 3

PROJ01 08training TRG

PROJ02 07Support SSG


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REORG UtilityREORG Utilityx Reorganizes tablespace to reclaim

fragmented space and improve accessperformance

x Alter the physical space parameters forthe tablespace

x Unload data in a format acceptable bythe LOAD utility


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REORG UtilityREORG Utilityx Input:x Name of tablespace or partition or

index to be reorganized

x Output:x Reorganized tablespace and / or

indexes


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REORG UtilityREORG Utilityx Phase Flow:

x UTILINITx UNLOADx

RELOADx SORTx BUILDx UTILTERM


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RUNSTATS UtilityRUNSTATS Utilityx Gathers information about data in

tablespaces and indexes and updatesDB2 catalog.

x Use RUNSTATS whenx * a table is loadedx * a table is reorganizedx * an index is createdx * extensive modifications done on

tablespace


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RUNSTATS UtilityRUNSTATS Utilityx Input:x Tablespace for which statistics is to be

updated / reported

x Output:x Report containing new statisticsx

Updated DB2 catalog tables


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RUNSTATS UtilityRUNSTATS Utilityx Phase Flow:

x UTILINITx

RUNSTATSx UTILTERM


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Data Backup - StandardData Backup - Standard

Utilities - COPY overviewUtilities - COPY overviewx COPY generates imagecopies of a ts,ts

partition or a dataset within a ts.x You cannot copy a tablespace with the

CHKP or RECP status.x Does not copy an Indexspace.


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COPY UtilityCOPY Utilityx Creates backup copies of a tablespace or

a single partition

x Reset copy pending status

x Two types: Full image copy,

Incremental image copy


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COPY UtilityCOPY Utilityx Input:x Name of tablespace or partition to be

copied

x Output:x A sequential dataset containing the

imagecopyx

SYSIBM.SYSCOPY updated


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Data Backup - COPY Data Backup - COPY

Outputs:x Creates upto 4 imagecopiesx Rows in SYSIBM.SYSCOPY for catalog

and SYSUTILX , SYSLGRNX for direct.x Either FULL or INCREMENTALx Can generate 2 sets of ics - local and

remote setx

Used by RECOVER TABLESPACE


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COPY utility - FULLCOPY utility - FULL

x A Full imagecopy with SHRLEVELREFERENCE is required, to reset theCOPY pending state of a tablespace.

x Recommended to take a full imagecopyafter a LOAD or a REORG

x Page Validation - inconsistencies arechecked for.


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COPY utility - IncrementalCOPY utility - Incremental

x FULL NO SHRLEVEL CHANGEx Has to be taken only after a FULL icx For large tables with update rates of

10% or less, an incremented ic maybefaster than a full ic


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Using DFSMS ConcurrentUsing DFSMS Concurrent

COPY and Local/RemoteCOPY and Local/Remotex CONCURRENT option of COPYx Restrictions exist on using Concurrent

copiesx 2 copies at Local site and 2 at Recovery

site can be taken using COPYDDN andRECOVERYDDN


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MERGECOPY utility MERGECOPY utility

x All incremental ICs are merged with anentry for the new incrementalimagecopy.

x NEWCOPY YES creates a full ICx NEWCOPY NO creates an incremental

IC


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REPORT UtilityREPORT Utility

x Report Tablespaceset reports tables andRIs.

x Report Recovery givesx Syscopy entriesx syslgrnx entries for log rangesx Archive log dataset infox DSNUM option for ts/partitionx History - CURRENTx Local Site/Recovery site


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QUIESCE UtilityQUIESCE Utility

x Stores a point of consistency for list oftablespaces

x Only concurrent read access is allowedfor QUIESCE utility

x SYSCOPY has ICTYPE Q and LogRBA in SYSIBM.SYSCOPY with timesta

x Run QUIESCE on all RI related tablesafter a REPORT

x Use QUIESCE at time of low activity


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CHECK INDEX CHECK INDEX

x Checks if indexes are consistent withthe data

x Used before CHECK DATA to ensurevalidity of indexes

x DBADM, DBCTRL , DBMAINT for dbx RECOVER INDEX can be used to re-

establish consistency.x Cannot be run for RECP objects


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CHECK DATA utilityCHECK DATA utility

x Verifies RIx Can be used to rectify RI violations by

deleting invalid rows from dependanttablespaces


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RECOVER INDEX RECOVER INDEX

x Indexes are recreated based on thetables they use

x Can refer tox one indexx a list of indexesx all indexes of a table spacex one partition of a partitioning index


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Monitoring Utilities Monitoring Utilities

x -DISPLAY UTILITYx -TERM UTILITY


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Starting and StoppingStarting and Stopping

Database ObjectsDatabase Objectsx - Start db2 access(maint) -access to only

Install Sysadm and Install Sysoprx -start db2 access(*) - general accessx -start db(*) spacenam(*)

access(force/ut/ro)x -stop db2x -stop db(*) - all except dsndb01,dsndb06

and dsndb07x -sto db * at commit sets STOPP stat


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States of Database ObjectsStates of Database Objects

x Monitored by -DISPLAY DATABASESPACENAM

x RECP, STOP, STOPP, CHKP, COPY,REST, PSRCP, RO, UT,UTRO,UTRW,UTUT - Restricted States

x RW - normal state


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Restricted States - COPY Restricted States - COPY

Cause : LOAD LOG NO

REORG LOG NOIncorrect page during COPYRECOVER ..TORBA

Action : COPY FULL YES SHRLEVELREFERANCE

REPAIR..SET TABLESPACE...NOCOPYPEND


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COPY - copy pendingCOPY - copy pending

A COPY pending state prevents anyupdate on ts and you cannot recoveryour ts. It will be reported at -displaydatabase....

Restrictions:x No update operationsx No QUIESCE


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Restricted States - CHKPRestricted States - CHKP

Cause : LOAD REPLACEAction: CHECK DATA..Cause: RECOVER TORBAAction: (verify first)

Cause : CHECK..DELETE NOAction: LOAD REPLACE..ENFORCECONSTRAINTS


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CHKP- Check pendingCHKP- Check pending

CHKP is a state of dependent tablespacesonly. A dependant ts is placed in CHKPstatus whenever RI in in doubt - RIviolation on any of the tables in ts.CHECKFLAG columns of

SYSTABLEPART and SYSTABLES.Restrictions: - No DML operations

No COPY, REORG, QUIESCE,

MODIFY, REPORT, RUNSTATS,


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Restricted States- RECPRestricted States- RECP

Cause: Abnormal end of LOAD,RECOVER,REORG

Action: RECOVERLOAD REPLACE

Cause : RECOVER..TORBA


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RECP - Recover pendingRECP - Recover pending

RECP is a state of a ts or an index. This isset when consistency of data in the ts orpartition or index is in doubt.

Restrictions:- No DML ALTER operations- No CHECK, COPY, REORG, MODIFY,

QUIESCE, LOAD RESUME, REPORT,RUNSTATS, STOSPACE


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Pending States - ExceptionalPending States - Exceptional

casescasesIf no alternatives, usex REPAIR SET TABLESPACE

NOxxxxPENDx -START DB(..) SPACENAM(..)

ACCESS(FORCE)x DROP TABLESPACE/TABLE*** If cause is not removed,

inconsistencies exist.


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INDOUBT Database ObjectsINDOUBT Database Objects

x Objects in INDOUBT state are LOCKedfor READ and UPDATE.

x Result of incomplete UR after anabnormal term between db2 and CICS.

x After re-establishing connections, theseare resolved automatically

x -RECOVER INDOUBTx -RESET INDOUBT


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Deffered Database ObjectsDeffered Database Objects

x Objects on DEFER list and log recordsx Object was in DEFER state at

terminationx Objects to be restarted with log records

to be applied at restart but these cannotbe written


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DB2 independant utilitiesDB2 independant utilities

x DSNJU004 - Print Log inventoryx DSN1LOGP - Log Print utilityx DSN1COPYx DSN1PRNTx

DSN1CHKRTo be run when DB2 is downx DSN1JU003 - Change Log inventory


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DSN1COPY Service AidDSN1COPY Service Aid

x DB2 VSAM data sets to sequential ds

x DSN1COPY sequential ds to DB2VSAM ds

x DB2 IC ds to DB2 VSAM dsx DB2 VSAM ds to other DB2 VSAM ds

x DSN1COPY sequential ds to othersequential ds.


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DSN1LOGP utilityDSN1LOGP utility

x A detailed report of individual logrecords

x Produces a summary report which aidsx perform conditional restartx resolve indoubt threads with a remote sitex Detect problems with data propogation

x Used on Archive log ds


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DSN1CHKR utilityDSN1CHKR utility

x Verifies the integrity of directory(DSNDB01) and catalog (DSNDB06)

tablespaces for broken links, brokenhash chains, and records that are notpart of any link or chain.


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DSN1PRNT DSN1PRNT

x Prints hex dumps ofx DB2 VSAM dsx IC dsx DSN1COPY sequential ds (ts or ix)

x Expands if data is compressed(EXPAND option)

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