1. Authoring for Performance
Sandeep Mekala
IRM, UIS

2. Cognos Structure for Analysis
Cognos Server Architecture
Presentation
Cognos Connection
Cognos Studios
Framework Manager
Data Warehouse (Dimensions and Facts)
ETL/ELT
Source Data (ICS, HCM, FIN, AD,DOM, ERA, DATC)

3. What happens when you run the report?

4. Level of performance Database Tier Framework Tier Report Tier
Table stats
Indexes
Summary Vs Detail Tables.
Framework Tier
Governors
Joins
Single schema
Report Tier
Report query
Prompt query
Query hints
Query processing
Filter
functions

5. Query Hints Goal Child Element to Add to the queryHints Element
Overrides this Governor, if Set in the Model
Warn about, prevent, or allow cross-product joins
crossProductAllowed
Cross-Product joins
Warn about, prevent, or allow outer joins
outerJoinAllowed
Outer joins
Specify whether and how to automatically sort level keys
autoSort
Specify that a request continues or terminates when a calculation or expression encounters a divide by zero error
avoidZeroDiv
Retrieve either all rows or the first row when rendering the output
executionOptimization
Specify whether any of the query processing is performed by the database server
queryProcessing
Specify whether rollup aggregates are computed by the database server, and if not, whether extended or running aggregates are computed
rollupProcessing
Specify whether to allow the query to run concurrently or to run the query sequentially.
executionMethod
Specify whether this query is given priority in determining parameter information.
useForParameterInfo
Allow or prevent local caching
localCache
Allow usage of local cache
Generate WITH clauses in the SQL, or generate derived tables instead
useSQLWithClause
Use WITH clause when generating SQL
Stop a query from continuing if the length of time it runs exceeds the number of seconds that you specify
maxQueryExecutionTime
Query execution time limits
Stop a query from continuing if the number of rows retrieved exceeds the value you specify
maxRowsRetrieved
Data retrieval limits
Stop a query from continuing if the number of tables queried exceeds the value you specify
maxTablesPerQuery
Report table limits
Stop a query from continuing if the size of any text BLOB exceeds the number of characters that you specify
maxTextBlobCharacters
Large text items limit
Specify whether to suppress null values
suppress
Specifies whether to use explicit or implicit join syntax in IBM Cognos SQL.
useSQLJoinSyntax
SQL Join Syntax
Specifies whether to use the complete SAP MUN as the business key.
useSAPMUNAsBusinessKey
Specifies whether to use the cache server for dimensions specified in the query.
cacheServerQuery
Specifies whether generated SQL uses parameter markers or literal values.
useSQLParameters
SQL Parameter Syntax