1. Holger Klemt hklemt@h-k.de
801 Serverperformance
Holger Klemt

2. Client Issues Use Parameters Prepare Queries
Active Transaction Control
Use SQL Components with execsql
Demodatabase and Example1

3. Index Issues Create Indexes where useful Avoid too many indexes
Read the Query Plan
Set Statistics
Demodatabase

4. Performance Analysis Indexed or Nonindexed Reads Memory Reads Writes
Fetches
Demodatabase SQL Commands

5. Database Statistics Difference Oldest to Next Transaction
Database fill distribution
Index Depth
Demodatabase Statistic

6. Try to avoid fields like varchar(32000) Small Segment Size for Blobs
Order by with more than one Column
UDF, Upper()
DESC without index
Containing, Like %XXX%
Subselects and Exists
Count, Sum, AVG, ...

7. Try to avoid Selects without a where clause
Where Clause on non Indexed fields
Too many tables in one Query (better create a stored procedure)
Long running Transactions
Too many Updates on the same row

8. Try to avoid
Requestlive
Recordcount
Filter
TTable

9. HK Tipps&Tricks
Set Buffers for each Database
Check forced Writes

10. HK Tipps&Tricks Like with Param vs. Like with const
Group by and Order By
Demodatabase

11. HK Tipps&Tricks Use extra harddisk for database,os and isc_temp
Use a fast writing Harddisk or RAID
Delete all Open GL (or unknown) Screen Saver on the Server
Demodatabase and filemon

12. HK Tipps&Tricks
Comparison of a client based and a server based operation
Demodatabase and Example2

13. HK Tipps&Tricks Use IDs in every Table for Primary Key
Foreign Keys only on IDs

14. Serverperformance
Q&A