[minor] Increase Manage sequence caches

[tomklapiscak]

https://jsw.ibm.com/browse/MASCORE-3761

Description

Adds Job(s) that run once Manage is configured and healthy that execute into the db2u pods and increase the cache value of sequences created in DB2 by Manage. This is to improve performance when loading large amounts of data into Manage.

A separate Job is created for each DB2 instance reserved for use my Manage. Most likely there will only ever be a single DB2 reserved for use by Manage; i.e. exactly 1 entry in ibm-db2u-databases.yaml with mas_application_id: "manage". But as our config model (in theory) permits more than one, it seems prudent to ensure this post Manage-sync DB2 maintenance Job is executed against all.

Roles permitting pod/exec access are created in the db2 namespaces and bound to a ServiceAccount in the manage namespace. This service account is used by the Job(s) in the Manage namespace to execute the necessary commands on the db2u pod.

Testing

• Test Job in an existing fvtsaastran cluster:

In Manage config ArgoCD app (masdev.manage.fvtsaastran.fvtsaastran) manifest:

            manage_db2u_databases:
              - db2_namespace: db2u-fvtsaastran
                db2_instance_name: db2wh-fvtsaastran-manage
                db2_dbname: BLUDB

Job and associated sources are successful created, Job executes successfully:

Before Job:

db2 => SELECT SEQNAME, CACHE FROM SYSCAT.SEQUENCES WHERE SEQNAME in ('ACCOUNTDEFAULTSSEQ', 'ACTCIRELATIONSEQ', 'MAXSEQ')

SEQNAME                                                                                  CACHE      
---------------------------------------------------------------------------------------- -----------
ACCOUNTDEFAULTSSEQ                                                                                 0
ACTCIRELATIONSEQ                                                                                   0
MAXSEQ                                                                                             0

  3 record(s) selected.

Job runs:

================================================================================
Settings
================================================================================
DB2_INSTANCE_ID ..................... db2wh-fvtsaastran-manage
DB2_DBNAME .......................... BLUDB
AVP_TYPE ............................ aws
DB2_NAMESPACE ....................... db2u-fvtsaastran
DB2_POD_NAME ........................ c-db2wh-fvtsaastran-manage-db2u-0

Create /tmp/alterseq.sh
--------------------------------------------------------------------------------
  #!/bin/bash
  db2 connect to BLUDB
  if [ $? != 0 ]; then
    echo "Failed to connect to database!"
    exit 1
  fi

  db2 "select 'alter sequence maximo.' || sequencename || ' cache 500;' from maximo.maxsequence" | grep "alter sequence" > "/tmp/alterseq.sh.sql"
  echo "alter sequence maximo.maxseq cache 2000;" >> "/tmp/alterseq.sh.sql"

  db2 -tvf "/tmp/alterseq.sh.sql" | tee "/tmp/alterseq.sh.sql.log" || exit $?

Copy /tmp/alterseq.sh to db2u-fvtsaastran/c-db2wh-fvtsaastran-manage-db2u-0
--------------------------------------------------------------------------------
... done

Executing /tmp/alterseq.sh file on db2u-fvtsaastran/c-db2wh-fvtsaastran-manage-db2u-0
--------------------------------------------------------------------------------
Defaulted container "db2u" out of: db2u, instdb (init), init-labels (init), init-kernel (init)

   Database Connection Information

 Database server        = DB2/LINUXX8664 11.5.9.0
 SQL authorization ID   = DB2INST1
 Local database alias   = BLUDB

alter sequence maximo.ACCOUNTDEFAULTSSEQ cache 500
DB20000I  The SQL command completed successfully.

alter sequence maximo.ACTCIRELATIONSEQ cache 500
DB20000I  The SQL command completed successfully.

...

alter sequence maximo.maxseq cache 2000
DB20000I  The SQL command completed successfully.

After Job:

db2 => SELECT SEQNAME, CACHE FROM SYSCAT.SEQUENCES WHERE SEQNAME in ('ACCOUNTDEFAULTSSEQ', 'ACTCIRELATIONSEQ', 'MAXSEQ')

SEQNAME                                                                                  CACHE      
---------------------------------------------------------------------------------------- -----------
ACCOUNTDEFAULTSSEQ                                                                               500
ACTCIRELATIONSEQ                                                                                 500
MAXSEQ                                                                                          2000

  3 record(s) selected.