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Revamp the tablespace reorg process with ibm db2 automation tool

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Bharath Nunepalli
Bharath Nunepalli

The speaker discussed how their organization revamped their tablespace reorganization (REORG) process using IBM's DB2 Automation Tool for z/OS. Previously, REORGs for over 1000 tablespaces ran monthly with limited parameters to determine need, taking over 8 hours. The new process uses the tool to create object, utility, exception, and job profiles to automate building REORG JCLs. This allows REORGs based on more parameters and exceptions, shortening the process while still reorganizing all needed tablespaces.

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Revamp the Tablespace REORG process with IBM DB2 Automation Tool for z/OS Bharath Nunepalli Senior Database Administrator Hospital Corporation of America Session Code: A09 8 AM, 05/03/2017 | Platform: DB2 for z/OS
Contents • HCA Inc. – Some details about us • Our ERP Environment • Why we need to change our REORG strategy? • Previous Tablespace REORG setup • Issues with previous Tablespace REORG setup • Requirements for new Tablespace REORG setup • How we changed our REORG strategy? 2
3 HCA Inc. – Some details about us: - 250 Hospitals & surgery centers - Ranked 63rd in Fortune 500. - 233,000 employees 37,000 active physicians 79,000 nurses 5,000 IT employees - 26 million patient encounters 8.1 million emergency visits per year
4 ERP System Financials Customer Relations Supply Chain Resource Planning Human Resource ERP Environment: - 120+ DBs supporting ERP package. In Prod: - 1000+ Tablespaces - 2,800 Tables & 7,500 IX per DB - Largest table has 1.5+ billion rows and 7 Indexes.
Previous Tablespace REORG setup Basic approach of executing REORGs for Tablespaces on monthly basis. 5
Issues/limitations with previous Tablespace REORG setup 1. REORG process for all (1000+) Tablespaces ran long (more than 8 hours sometimes, if no errors). 2. REORG not needed for all TS every time. 3. Using only 2 parameters to decide whether REORG is needed or not. OFFPOSLIMIT INDREFLIMIT Requirements for new strategy 1. Shorten overall REORG execution time. 2. More parameters to decide the need for REORG for a TS. 6
DB2 Automation Tool for z/OS v4.2 Phase 1: Create Object Profile Phase 2: Create Utility Profile Phase 3: Create Exception Profile Phase 4: Create Job Profile Phase 5: Build REORG JCLs 7
Phase 1: Create Object Profile 8 Option 1 to add Objects to a Profile
9 Option 2 to add Objects to a Profile
Phase 2: Create Utility Profile 10
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Revamp the tablespace reorg process with ibm db2 automation tool
Phase 3: Create Exception Profile 16
Exception criteria 17 AND/ OR Statistics Type Column Cond Exception Value Comments OR REALTIME REORG TS INS_UPD_DEL_PCT > 30 The number of inserts, updates, and deletes as a percentage of the total number of rows RELOCATED_ROWS_PCT > 20 Total number of relocated rows as a percentage of the total number of rows AND REALTIME REORG TS UNCLUST_INS_PCT > 15 The number of inserted rows placed greater than 16 pages away from target page, as a percentage of the total number of rows CLUSTERSENS > 1000000 The number of times data has been read by SQL sensitive to clustering sequence of data since last REORG or LOAD REPLACE OR MVS CATALOG PERCENT_USED > 90 The percentage of space used for each individual object partition OR DB2 DISPLAY STATUS STATUS_AREOR = YES The object is in the advisory REORG-pending status and needs reorganization to apply pending definition changes STATUS_AREO* = YES The object is in the advisory REORG-pending status
Phase 4: Create Job Profile 18
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20 Combination not allowed. One of these fields must be 0 and the other field greater than zero. With ‘Y’, dummy jobs will be generated. Helpful to maintain the consistent job count.
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Phase 5: Build REORG JCLs 23
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Special Thanks to John Casey (Tech Sales Specialist) Richard Schaufuss (DB2 for z/OS Tools Advocate) 26
27 Questions
Bharath Nunepalli Senior Database Administrator Hospital Corporation of America Bharath.nunepalli@hcahealthcare.com bharathstechblog.blogspot.com A09 Revamp the Tablespace REORG process with IBM DB2 Automation Tool for z/OS Please fill out your session evaluation before leaving!

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Revamp the tablespace reorg process with ibm db2 automation tool

  • 1. Revamp the Tablespace REORG process with IBM DB2 Automation Tool for z/OS Bharath Nunepalli Senior Database Administrator Hospital Corporation of America Session Code: A09 8 AM, 05/03/2017 | Platform: DB2 for z/OS
  • 2. Contents • HCA Inc. – Some details about us • Our ERP Environment • Why we need to change our REORG strategy? • Previous Tablespace REORG setup • Issues with previous Tablespace REORG setup • Requirements for new Tablespace REORG setup • How we changed our REORG strategy? 2
  • 3. 3 HCA Inc. – Some details about us: - 250 Hospitals & surgery centers - Ranked 63rd in Fortune 500. - 233,000 employees 37,000 active physicians 79,000 nurses 5,000 IT employees - 26 million patient encounters 8.1 million emergency visits per year
  • 4. 4 ERP System Financials Customer Relations Supply Chain Resource Planning Human Resource ERP Environment: - 120+ DBs supporting ERP package. In Prod: - 1000+ Tablespaces - 2,800 Tables & 7,500 IX per DB - Largest table has 1.5+ billion rows and 7 Indexes.
  • 5. Previous Tablespace REORG setup Basic approach of executing REORGs for Tablespaces on monthly basis. 5
  • 6. Issues/limitations with previous Tablespace REORG setup 1. REORG process for all (1000+) Tablespaces ran long (more than 8 hours sometimes, if no errors). 2. REORG not needed for all TS every time. 3. Using only 2 parameters to decide whether REORG is needed or not. OFFPOSLIMIT INDREFLIMIT Requirements for new strategy 1. Shorten overall REORG execution time. 2. More parameters to decide the need for REORG for a TS. 6
  • 7. DB2 Automation Tool for z/OS v4.2 Phase 1: Create Object Profile Phase 2: Create Utility Profile Phase 3: Create Exception Profile Phase 4: Create Job Profile Phase 5: Build REORG JCLs 7
  • 8. Phase 1: Create Object Profile 8 Option 1 to add Objects to a Profile
  • 9. 9 Option 2 to add Objects to a Profile
  • 10. Phase 2: Create Utility Profile 10
  • 11. 11
  • 12. 12
  • 13. 13
  • 14. 14
  • 16. Phase 3: Create Exception Profile 16
  • 17. Exception criteria 17 AND/ OR Statistics Type Column Cond Exception Value Comments OR REALTIME REORG TS INS_UPD_DEL_PCT > 30 The number of inserts, updates, and deletes as a percentage of the total number of rows RELOCATED_ROWS_PCT > 20 Total number of relocated rows as a percentage of the total number of rows AND REALTIME REORG TS UNCLUST_INS_PCT > 15 The number of inserted rows placed greater than 16 pages away from target page, as a percentage of the total number of rows CLUSTERSENS > 1000000 The number of times data has been read by SQL sensitive to clustering sequence of data since last REORG or LOAD REPLACE OR MVS CATALOG PERCENT_USED > 90 The percentage of space used for each individual object partition OR DB2 DISPLAY STATUS STATUS_AREOR = YES The object is in the advisory REORG-pending status and needs reorganization to apply pending definition changes STATUS_AREO* = YES The object is in the advisory REORG-pending status
  • 18. Phase 4: Create Job Profile 18
  • 19. 19
  • 20. 20 Combination not allowed. One of these fields must be 0 and the other field greater than zero. With ‘Y’, dummy jobs will be generated. Helpful to maintain the consistent job count.
  • 21. 21
  • 22. 22
  • 23. Phase 5: Build REORG JCLs 23
  • 24. 24
  • 25. 25
  • 26. Special Thanks to John Casey (Tech Sales Specialist) Richard Schaufuss (DB2 for z/OS Tools Advocate) 26
  • 28. Bharath Nunepalli Senior Database Administrator Hospital Corporation of America [email protected] bharathstechblog.blogspot.com A09 Revamp the Tablespace REORG process with IBM DB2 Automation Tool for z/OS Please fill out your session evaluation before leaving!