1 DBA Tools with System i Navigator Doug Mack IBM DB2 for i Center of Excellence Follow Learn more at IBM Corporation
2 Why do I need a DBA? IBM Corporation
3 Ease of Database Management Typical DBA Tasks Manage DASD Space Allocation Review Table Space Allocations & Extents Review & Balance Indexes Application Rebinding Maintain Database Integrity Update Database Statistics Synchronized OS & DB User Security Reload Data for Hardware & Software Upgrades Load Data into Database Build and Manage DB Backup & Recovery Create & Review Indexes for Tables Performance Analysis & Tuning (DB & System) Create and Maintain DB Schema Automated DB Performance Profiling Advanced DB Performance Analysis & Tuning Data Replication & Consolidation DB2 for IBM i Automated Automated Automated Automated Automated Automated Automated Automated System i Navigator System i Navigator System i Navigator / Automated Index Advisor System i Navigator System i Navigator & 3rd Party Tools 3rd Party Tools System i Navigator 3rd Party Tools Multiple IBM & 3rd Party Products IBM Corporation
4 DBA tasks that an IBM i Administrator or Developer SHOULD care about: Monitoring, Analyzing, and Improving Database Performance Keeping an eye on database limits You don t want your application to fail by exceeding a built in limit Wasted space Reducing Redundancy (e.g., unneeded indexes) Files with empty records or no data at all SQL Optimization and Tuning ODBC, Reporting Tools, Applications using SQL SQL is the STRATEGIC database interface.you want to ensure it is optimized! System Performance Tools are not DATABASE performance tools System performance should assume a well tuned application, and that includes database! If you haven't tuned the database, you could be making decisions based on questionable data IBM Corporation
5 Why Use SQL? Take advantage of features and functions only available via SQL XML, Text Search, EVI s, etc. Programmer Productivity PERFORMANCE Take advantage of modern solutions and tooling based on SQL Data modeling tools More easily turn data into information Protect sensitive data Field Level Encryption Increase reusability of existing components in both current and future applications Increase the life expectancy and extend the value of legacy applications Reusability of data, functions, procedures, across platforms and systems Availability of talented SQL programmers IBM Corporation
6 IBM i Navigator the DBA tool for DB2 for i Ships with IBM i Access for Windows The database graphical user interface is a component of System i Navigator IBM i Navigator comes with the base operating system for no extra charge None of the database GUI support requires an IBM i Access License When installing IBM i Access on your PC Database is not selected by default. Select Custom" install For general information on IBM i Access Express for Windows check our web site at: (PTFs are available from a link off the above page) We recommend the latest version of the client be installed. Some new functions available Works fine with down level servers 6
7 Other DB2 DEVELOPER Tools of Interest (not discussed here) Infosphere Data Architect Data Modeling Reverse Engineer PFs/LFs to document or recreate with SQL Rational Developer for Power for Business Adds Data perspective build stored procedures, work with objects Optim Data Studio DB2 family database functions DB2 Connect Plug Ins for workbenches such as MS Visual Studio and Ruby on Rails 3 rd party Development Tools SQuirreL
8 Side Note: You need to get the appropriate Authority to DO YOUR JOB!!! *JOBCTL (Job Control Authority) Whatever worked with *JOBCTL in IBM i 6.1 will continue to work QIBM_DB_SQLADM Database Administrator This is a database specific alternative to *JOBCTL. It is a superset of the function authorized by QIBM_DB_SYSMON. Examples: - Change parallel degree for DB2 SMP feature - Work with Plan Cache - Work with OmniFind Text Search Server QIBM_DB_SYSMON Database Information This allows a user to view some system level details, but not specifics about operations or anything related to changing or controlling the database. Examples: - QUSRJOBI for SQL information - Show SQL Information for Jobs User Authorization Commands: CHGFCNUSG FCNID(QIBM_DB_SQLADM) USER(userid) USAGE(*ALLOWED) CHGFCNUSG FCNID(QIBM_DB_SYSMON) USER(userid) USAGE(*ALLOWED) No Special Authority required when using OnDemand Performance Center with own job Starting and ending SQL Performance Monitors on your own job Analysis of SQL Monitor data and Plan Cache snapshots Visual Explain in Run SQL Scripts
9 General Navigation through inav + Expand Left click to show Information in display window Display Window Right click on any object for context sensitive Menu 10
10 Add a connection Right Click on My Connections 11
11 Select Schemas (Libraries) to display right click on Schemas 12
12 Select Schema to include in the list 13
13 View objects within schema by selecting that schema SQL Aliases User Defined Functions Index Info Stored Procedures Table Info Triggers User Defined Types XML Schema (7.1) OmniFind Text Indexes (6.1) 14
14 Click on Tables Right click on specific Table for more info 15
15 Table Definition 16
16 Show Column Definitions 17
17 View or Add Constraints 18
18 Table Description 19
19 Table Description Answers questions like: How big is this table/file getting anyway? Works for indexes and views too! 20
20 Show Indexes from TABLE list right click, Show Indexes 21
21 Index Information for a table 22
22 Additional index information 23
23 Creating Objects with SQL Scripting and Wizards 24
24 Run SQL Scripts Settings Set up your default environment CONNECTIONS -> JDBC Settings Can set: SQL or System Naming Convention Schema list override or use libl Isolation level Some Performance Settings Some translation settings OPTIONS Check SQL Portability Change Query Attributes Allow Save Results to save into a spreadsheet, for instance 25
25 Run SQL Scripts Create/save scripts for repetitive tasks Both SQL statements and CL commands Debug Stored Procedures Do Visual Explain on queries, for performance analysis and tuning Syntax error highlighting SQL state errors in message box, including second level text Prompting of CL commands Support for Global Variables 7.1 (new tab) 26
26 Creating a Schema (Library) with Free Form SQL CREATE SCHEMA MYSCHEMA; Organizational construct Library/Folder A stored procedure is shipped with IBM i that can create sample schemas CALL CREATE_SQL_SAMPLE( CORPDATA ); Contains tables (including sample data), views, aliases, indexes, and RI CORPDATA is used in the SQL manuals and labs 27
27 SQL/CL Scripting with Assists Enter SQL/CL Command Right Click to get menu Insert from Examples Choose from many prebuilt SQL Statements SQL Assist/Prompt CL Wizard guides you through creation 28
28 Generate SQL Regenerate SQL CREATE/ALTER statements directly from the existing objects Helpful for when the original statements are no longer available Teach programmers about SQL syntax of objects See what the SQL form of my DDS-created files would be like Include generating short names of objects Save to SRCPF IFS file UTF8 file Spread sheet Does not generate RI and triggers for tables 29
29 Scenario Find the first occurrence of IBM in a very large book What do you do first? Turn to the index! in dex Something that serves to guide, point out, or otherwise facilitate efficient reference.
30 Creating a useful index is both a Science and an Art.
31 DB2 for i Two types of indexing technologies are supported Radix Index Encoded Vector Index Each type of index has specific uses and advantages Respective indexing technologies compliment each other Indexes can be used for statistics (building a plan) and implementation (query execution) Indexes can provide RRNs and/or data Indexes are scanned or probed Probe can only occur on contiguous, leading key columns Scan can occur on any key column Probe and scan can be used together
32 Radix Index ROOT Database Table 001 ARKANSAS 002 MISSISSIPPI Test Node MISS 003 MISSOURI 004 IOWA 005 ARIZONA IZONA 005 AR KANSAS 001 IOWA 004 ISSIPPI 002 OURI 003 ADVANTAGES: Very fast access to a single key value Also fast for small, selected range of key values (low cardinality) Provides order DISADVANTAGES: Table rows retrieved in order of key values (not physical order) which equates to random I/O s No way to predict which physical index pages are next when traversing the index for large number of key values
33 Encoded Vector Index (EVI) Index for delivering fast data access in analytical and reporting environments Advanced technology from IBM Research Used to produce dynamic bitmaps and RRN lists Fast access to statistics to improve query optimizer decision making Not a tree structure Can only be created through an SQL interface or Navigator for i GUI CREATE ENCODED VECTOR INDEX MySchema.IXName ON MySchema.TabName(KEY(s)) INCLUDE ( SUM(SomeOtherColName)); New in 7.1 Maintained aggregate
34 Encoded Vector Index (EVI) Symbol Table Key Value Include Include Code Count Sum() Sum() Arizona Arkansas Wisconsin Wyoming optional Vector RRN Symbol table contains information for each distinct key value - Each key value is assigned a unique code (key compression) - Code is 1, 2, or 4 bytes depending on number of distinct key values - Enhanced in i 7.1 to include SUM and COUNT in the definition Rather then a bit array for each distinct key value, use one array of codes
35 Index ANDing Zig Zag Example EVI State EVI Workdept SELECT * FROM EMPLOYEE WHERE STATE = MINNESOTA' AND WORKDEPT IN ( 'B01', C01, 'E01') Intermediate RRN list Intermediate RRN list Final RRN list AND (Merge) Represents all the local selection State Workdepts
36 Autonomic Index Creation DB2 Optimizer can have DB2 automatically create a temporary index Both full and sparse ( where statement added) indexes can be created Temporary indexes are not used for statistics Temporary indexes are maintained CQE Temporary indexes are not reused and not shared Usually a bottleneck in query performance Can impact overall system performance Can increase the amount of temporary storage used SQE Temporary indexes are reused and shared across jobs and queries Creation is based on watching the query requests over time Creation is based on optimizer s own index advice Temporary index maintenance is delayed when all associated cursors closed
37 Create all advised indexes? Nothing, let the system handle it? Monitor, analyze, and tune important tables and queries?
38 System Wide Index Advice right click on SYSTEM 40
39 Index advice 41
40 Index advise (Scroll right ) 42
41 Create Index by.right clicking on Index advised 43
42 SQL Statement Analysis Database Monitor Requires you to turn it on (inav, also STRDBMON CL Command) Summary no problem, run all day, but limited analysis available Detail BE VERY CAREFUL Performance hit may be significant Captures SQL being processed by CQE as well as SQE Try to collect problem statements/apps Try to use FILTERS to isolate what you collect Can send captured data to another system to analyze SQL Plan Cache SQE Only Data collected by system all day with negligible impact to system performance Can analyze statements while still running Save (capture) SQL Plan Cache snapshots for later analysis Useful for comparing before and after 44
43 Starting a DB performance Monitor 45
44 Analyzing Database (SQL Performance) Monitor Data 46
45 Show Statements (consider Filtering) Filter to minimize statement loading time and analysis Sort on any column to zero in on what you are looking for Longest running statements User or job specific statements 47
46 Live Analysis through SQL Plan Cache: Show Statements 48
47 Filtering 49
48 Save statements to a Plan Cache Snapshot 50
49 Analyze the snapshot Same options available for Monitors 51
50 Invoking Visual Explain Visually explain how the statement was processed by DB2 Incredibly powerful information Right click on a statement 52
51 Visual Explain Active window - Look at DB objects (indexes, constraints, etc.) involved Attributes show all the settings that impact query optimizer Labels include optimizer s estimates SQE plans show decomposed SQL statement for each operation Icon Highlighting to speed analysis Expensive nodes Index Advised nodes Debug messages help bridge to picture 53
52 Visual Explain Index Advisor
53 Index Advice at statement level Click on walking shoes icon Click on CREATE to walk through creation of index 55
54 Indexing Strategy Case Study Part_Orders O 15 GB 60,000,000 rows 595 LPAR V5R4 (4) CPUs 10 GB in memory pool (45) 70 GB disk units O.Custkey = C.Custkey O.Partkey = P.Partkey Customers C Parts P 322 MB 1,500,000 rows 236 MB 1,600,000 rows 56
55 Indexing Strategy Case Study 80 SQL requests from a single JDBC connection 2 SETs 53 SELECTs 15 INSERTs 5 UPDATEs 15 DELETEs 73 via SQE 5 via CQE Scenarios 1. No indexes 2. Indexes on join columns only 4 radix indexes 3. Indexes for selecting, joining, grouping, ordering 13 radix indexes 2 encoded vector indexes
56 Indexing Strategy Case Study Indexes on join columns only create index part_orders_ix1 on part_orders (custkey); create index part_orders_ix2 on part_orders (partkey); create index customers_ix1 on customers (custkey); create index parts_ix1 on parts (partkey); Index for selecting, joining, grouping, ordering create index part_orders_ix3 on part_orders (returnflag, custkey); create index part_orders_ix4 on part_orders (shipmode, custkey); create index part_orders_ix5 on part_orders (orderkey, linenumber, custkey); create index part_orders_ix6 on part_orders (orderkey, custkey); create index part_orders_ix7 on part_orders (returnflag, partkey); create index part_orders_ix8 on part_orders (shipmode, partkey); create index part_orders_ix9 on part_orders (orderkey, linenumber, partkey); create index customers_ix2 on customers (customer, custkey); create index parts_ix2 on parts (part, partkey); create encoded vector index part_orders_evi1 on part_orders create encoded vector index part_orders_evi2 on part_orders (returnflag); (shipmode);
57 Indexing Strategy Case Study Results 7,000 6,000 5,000 4,000 3,000 2,000 1,000 0 All IX Join IX No IX Total Runtime Max Runtime Avg Runtime Total Time Max Time Avg Time All Indexes Join Indexes 5, , No Indexes 6, ,
58 Starting Health Center Right Mouse Click on DB name 61
59 Health Center Overview to see database object counts by category View database wide or schema specific % wildcards can be used Capture to history file View history of counts for trending Environmental Limits 62
60 Monitoring Long Running Jobs Database Maintenanace (7.1) 63
61 Table Re-orgs (as an example) 64
62 Reorganize Table Progress Monitoring New reorganize table options: Allow suspend (cancel) Allow online access Allow changes Influence when to rebuild access paths Allow reorganize to be suspended and resumed later 65
63 Right Mouse click on the reorg to see status 66
64 DB2 for i Center of Excellence (Lab Services) How can we help? IBM i for Business Intelligence Installation Services DB2 Web Query Getting Started Services Query/400 Modernization Services DB2 for i Modernization Workshop(s) DB2 for i SQL Performance Workshop DB2 for i SQL Performance Health Check DB2 for i Very Large Database (VLDB) Assessment* DB2 for i remote database administration and engineer services For more information, contact Mike Cain Or Doug Mack
DB2 for i Monitoring, Analysis and Tuning Mike Cain IBM DB2 for i Center of Excellence Rochester, MN USA firstname.lastname@example.org 8 Copyright IBM Corporation, 2008. All Rights Reserved. This publication may refer
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