1. TEMP-TABLE Performance Tuning & Other Important Stuff
Dan Foreman
Progress BravePoint

2. Introduction- Dan Foreman
Progress user since 1984
This year is my 30 year anniversary with Progress
Guest Speaker at dozens of Progress Conferences 1990 until Today

3. Dan Foreman Publications
Progress Performance Tuning Guide
Progress Database Admin Guide
Progress System Tables Guide
All updated through V11.3
Hope to have them in ePub and/or Kindle format in the next few months

4. Who Are You?
Progress V6, V7, V8, V9, V10, V11

5. Miscellaneous Mobile phones on silent or vibrate please
TT = Temp Table
V11 = OE11

6. To Do for Next Time
Does monitoring EMPTY TEMP-TABLE “lie” about the number of records deleted?
Example showing dynamic temp-tables
Program to show all fields for the various “pseudo VSTs”
Why does tt-data1/3.p not show the dynamic TTs?
What are the mystery tables (count 2, peak 9) ????
Benchmark the overhead of turning on the TT monitors

7. Before TT there were WORK-FILEs
100% Memory resident
No indexes
Record access is sequential
FIND FIRST > FIND LAST > FIND FIRST
Increasing the size of a record can be very expensive
Can potentially crash a system with three 4GL statements…….

8. Temp-Table Basics Similar to DB Tables
CRUD (Create, Read, Update, Delete)
Changes are not logged to the Before Image or After Image files
Subject to LBI activity unless NO-UNDO is used
Type 2 Storage “Areas”
No record locking
No latching (in DB shared memory)

9. TEMP-TABLE Basics
TT data is written to a Client temporary file with a DBI prefix
DBI file is similar to a “real” DB but with no AI, BI, LG, LK files
Location of Client Temp Files can be set with –T parameter
Temp Files are hidden on Win & Unix
Unix/Linux: -t
Windows: DIR /ah

10. Emptying a TEMP-TABLE EMPTY TEMP-TABLE tablename
Much faster than a Loop

11. NO-UNDO NO-UNDO on the TEMP-TABLE Definition
If NO-UNDO isn’t used, changes to TT inside of a transaction are logged to a Client Temp file with lbi prefix

12. TT Startup Options
-tmpbsize – the block size used for the TT “database”
Client Startup Parameter
The default has changed more than once so we recommend setting it explicitly
-tmpbsize 8 recommended
-Bt – memory buffers for Temp-Tables
Memory = (-Bt * -tmpbsize) * (# of Clients)

13. Pre-V11 TT Monitoring Options
None – at least nothing that’s built in
Monitoring the size of the DBI file is about the only useful metric available

14. V11 Delayed TT Instantiation
The app doesn't incur the overhead of instantiating a TT until it's actually referenced
The pre-V11 model instantiates all TT's when a new program is run, regardless of whether they are referenced or not
Use -nottdelay to revert to the old functionality

15. Temp Table Logging
“The OpenEdge Logging Infrastructure has been enhanced so that application developers can trace the creation and deletion of temp-tables in their applications. This logging capability strengthens the ability to troubleshoot applications that utilize temp-tables and ProDataSets as their primary data structures.”

16. VSTs for Temp Tables
“This ABL enhancement allows clients to gather information about the temp-tables used by the application via Virtual System Tables. These tables give the application access to database activity and status information, enabling an application to understand, debug, and tune the use of temp-tables within their application at runtime.”

17. Progress.Database.TempTableInfo Class
“Provides information about a temp-table and its indexes and provides static properties and methods for retrieving and archiving temp-table information for an ABL session”

18. TempTableInfo Properties
ArchiveIndexStatistics
ArchiveTableStatistics
TempTableCount
TempTablePeak

19. TempTableInfo Methods
GetIndexInfoByID()
GetIndexStatHistoryHandle( )
GetTableInfoByID( )
GetTableStatHistoryHandle( )
GetTableInfoByPosition( )
GetVSTHandle( )

20. Starter Code
USING Progress.Database.*. Progress.Database.TempTableInfo:ArchiveTableStatistics = YES. Progress.Database.TempTableInfo:ArchiveIndexStatistics = YES.

21. Instant Error So you lookup Message# 15247:
Cannot set Progress.Database.TempTableInfo:ArchiveTableStatistics (15247)
So you lookup Message# 15247:
“Update to the property or field is not allowed. This can happen if the given object only provides read-only access to the property based on its state.”
What ????

22. V11 Client Startup Parameters
-ttbasetable
-tttablerangesize
Default is 0; no statistics are recorded
Default for the DB –tablerangesize is 50

23. V11 Client Startup Parameters
-ttbaseindex
-ttindexrangesize
Default is 0; no statistics are recorded
Default for the DB –indexrangesize is 50

24. Try Again Using this .pf file -ttbaseindex 1 -ttindexrangesize 100
-ttbasetable
-tttablerangesize

25. Progress.Database.VSTTableId Class
“Provides static properties that identity the VST for returning specific temp-table information for an ABL session”

26. VSTTableId Properties
ActBufferId
DbStatusId
ActIOTypeId
MstrBlkId
ActSpaceId
TransId
BuffStatusId
UserTableStatId
IndexStatId
ActIOFileId
TableStatId
ActRecordId
UserIndexStatId
BlockId
ActIndexId
FileListId
ActOtherId
StatBaseId
ActSummaryId
UserIOId

27. Demonstration
basic.p
tt2.p
tt-data1.p

28. Questions? Questions? Conference Evaluations Thank You! Contact:
Dan Foreman
(but not right now please)