Using Database Diagnostic and Tuning Packs through Oracle Enterprise Manager 12c. Eric Siglin OCM, OCP, CTT+ Senior Oracle DBA

Transcription

1 Using Database Diagnostic and Tuning Packs through Oracle Enterprise Manager 12c Eric Siglin OCM, OCP, CTT+ Senior Oracle DBA

2 ERCOT Quick Facts ERCOT covers 75% of Texas land ERCOT handles 85% of Texas load (23 million consumers) via More than 40,500 miles of transmission lines and 550+ generation units (more than 74,000 MWs of capacity) Peak Demand in ERCOT was set on August 3, 2011 at 68,305 MWs Physical assets are owned by transmission providers and generators, including Municipal Utilities and Cooperatives Responsibilities The Texas Legislature restructured the Texas electric market in 1999 by unbundling the investor-owned utilities and creating retail customer choice in those areas, and assigned ERCOT four primary responsibilities: System reliability planning and operations Open access to transmission Retail switching process for customer choice Wholesale market settlement for electricity production and delivery. 9/28/14 2

3 Eric Siglin Senior Oracle DBA 28+ years of IT experience 20+ years of Oracle experience (DBA and Developer) 10 years of instructing Oracle University courses Experience in: Oracle Database versions 6 on up Oracle RAC and Data Guard Oracle GoldenGate, Streams and Advanced Replication Oracle Enterprise Manager 9/28/14 3

4 Session Topics Set up User Access Determine Workload Gather SQL Statements Analyze SQL Bring It Together Questions 9/28/14 4

5 Session Topics Set up User Access Determine Workload Gather SQL Statements Analyze SQL Bring It Together Questions 9/28/14 5

6 OEM User Access Create users through OEM UI Each user takes about 15 mouse clicks Time consuming for large number of users Use LDAP-authenticated accounts Auto-generated accounts ease administration LDAP groups matching EM roles ease authorization Create users through command line interface Generate your user create script Allows for batch processing of user creation Example of EMCLI: emcli create_user -name="sparke" -password="my14oem#1 -type="em_user -roles="ercot_dev_user -profile="mgmt_admin_user_profile" -desc="spark-e -expired="true" -department="354" -location="taylor" 9/28/14 6

7 User Access Requirements Diagnostic and Tuning Packs are a database feature EM provides a user-friendly interface Privileges are required by the database user accessing the feature Create a role for each pack Grant the Diagnostic Pack role to the Tuning Pack role Grant the appropriate role to the database user Example: CREATE ROLE diagnostic_pack_access_role; GRANT select any dictionary TO diagnostic_pack_access_role; GRANT oem_advisor TO diagnostic_pack_access_role; GRANT EXECUTE ON dbms_workload_repository TO diagnostic_pack_access_role; CREATE ROLE tuning_pack_access_role; GRANT diagnostic_pack_access_role TO tuning_pack_access_role; GRANT administer sql management object TO tuning_pack_access_role; GRANT tuning_pack_access_role TO sparke; 9/28/14 7

8 Session Topics Set up User Access Determine Workload Gather SQL Statements Analyze SQL Bring It Together Questions 9/28/14 8

9 Narrow your scope Look at top SQL in latest ADDM report Identify candidate statements in Real-Time SQL Monitoring Use the performance tab of the database target Run user-defined ADDM report for time period of interest 9/28/14 9

10 ADDM Report Analyzes the AWR data for you! SQL ID Impact on the workload. 9/28/14 10

11 Real-Time SQL Monitoring See what s going on as it happens! Make note of the SQL ID. You ll want that later. 9/28/14 11

12 Real-Time SQL Monitoring Living, breathing explain plan! Great for justification report 9/28/14 12

13 Real-Time SQL Monitoring Live SQL execution statistics! Links to SQL tools 9/28/14 13

14 Identify Your Time Period of Interest We re about to gather some SQL. End of workload 9/28/14 14

15 Session Topics Set up User Access Determine Workload Gather SQL Statements Analyze SQL Bring It Together Questions 9/28/14 15

16 Organize Statements in SQL Tuning Sets DB Object for SQL Analysis SQL Statement(s) Execution Context Execution Statistics Managed with DBMS_SQLTUNE from SQL command line or OEM. Portable Pack SQL Tuning Set into a staging table. Export staging table and import into another database. Unpack staging table in receiving database. Used as input to SQL Analysis tools 9/28/14 16

17 Create SQL Tuning Set 9/28/14 17

18 Name and Load SQL Tuning Set 9/28/14 18

19 Load SQL Tuning Set from AWR Snapshots 9/28/14 19

20 Filter SQL Statements 9/28/14 20

21 Submit OEM Job to Create STS 9/28/14 21

22 Session Topics Set up User Access Determine Workload Gather SQL Statements Analyze SQL Bring It Together Questions 9/28/14 22

23 Tools to Analyze SQL SQL Tuning Advisor Each SQL statement analyzed individually Displays information about execution plans Reports recommendations and rationale SQL Access Advisor Analyzes statements with respect to workload Can recommend indexes, materialized views and partitioning Displays recommendations, rationale and potential impact 9/28/14 23

24 SQL Tuning Advisor Analysis shows performance improvement may be possible. Recommendations for changes to statement access path is not this tool s forte. Review recommendations to understand situation. 9/28/14 24

25 SQL Access Advisor Summary Summarizes the impact on the workload by the generated recommendations. Displays the number of recommendations based on analysis constraints. Displays the number of SQL statements analyzed based on filtering constraints. 9/28/14 25

26 SQL Access Advisor Recommendations Recommendations are ordered by their impact to the workload analyzed. Focus on the recommendation with the most impact. Drill down into the details to identify the statements affected by this recommendation. 9/28/14 26

27 SQL Access Advisor Recommended Actions Allows you to customize and harvest the implementation script. 9/28/14 27

28 SQL Access Advisor Recommended Actions Lists actions to take Indicates whether recommended action has already been implemented. Field to enter schema and/or tablespace name(s) for use when generating the implementation DDL. 9/28/14 28

29 Scrutinize Recommended Actions Apply your system expertise to the recommended actions. Does it make sense to partition all of the tables in the list? Use meaningful object names that fit with your standards. Does the partitioning method make sense? What is the column data value distribution? How many hash buckets? 9/28/14 29

30 Session Topics Set up User Access Determine Workload Gather SQL Statements Analyze SQL Bring It Together Questions 9/28/14 30

31 Put the Pieces Together Collaboration is needed for an effective solution. Technical experts confer. Data Architect Database Administrator Application Developer Review technical analysis. Determine best hypothesis. Deploy and test solution. Check to see if the execution plan is as expected. Test work load to see if performance improves. Monitor system for any side effects from the change. 9/28/14 31

32 Summary Utilize tools to assist you in analyzing SQL performance issues. Automatic Database Diagnostic Monitor (ADDM) Database SQL Tuning Advisor SQL Access Advisor Use SQL Tuning Advisor to help identify statements that need attention. Use SQL Access Advisor to help recommended changes to improve SQL access to the data Collaborate with colleagues to develop best solution. Deploy and test hypothesis. Did the change have the intended result? Has the performance improved? Are there any side effects from the change? 9/28/14 32

33 Resources Oracle Enterprise Manager product page on the Oracle Technology Network: Product overview Demonstrations (Screenwatches): Product documentation: Community discussion forums and blogs Links to other learning opportunities like live webcast events: Oracle by Example Using SQL Tuning Advisor through SQL Developer 3.0: ::NO:24:P24_CONTENT_ID,P24_PREV_PAGE:5591,29 My Oracle Support (MOS) document Release Schedule of Current Enterprise Manager Releases and Patch Sets (10g, 11g, 12c) (Doc ID ) 9/28/14 33

34 Questions 9/28/14 34