Oracle 10gR2 – Conditional PL/SQL Compilation – AMIS Oracle and Java Blog

For one of our sessions for the Knowledge Center Oracle Server Development I had to prepare a presentation and demonstration on new Oracle 10gR2 features in SQL and PL/SQL – as well as reflect on some by now somewhat more established 10gR1 features. If you are interested in this presentation, you can download it here... Continue Reading →

PLSQL corner

PLSQL loop inexed by letters

But this is not portable across character sets. I think a better solution is to declare up front your index variables like this:

That way if you change character sets (e.g. to utf8) you are not reliant on a collating sequence that doesn't match your char set.

Unique session ID

The UNIQUE_SESSION_ID function returns a character string unique to the session among all sessions currently connected to the database. The return string can be up to 24 bytes in length. Multiple calls to the function from the same session will always return the same string. The program header follows:

Notes UNIQUE_SESSION_ID is functionally identical... Continue Reading →

Narzędzia to projektowania baz danych

GNU-GPL OpenSystemArchitect http://www.codebydesign.com/ Power*Architect http://code.google.com/p/power-architect/ Druid http://druid.sourceforge.net/ ERW http://erw.dsi.unimi.it/ Dia http://live.gnome.org/Dia XML to DDL (python scripts) http://xml2ddl.berlios.de/ Graphiz - I believe I've read of people using it to reverse engineer from DDL http://graphviz.org/ Multiple versions/licenses (each has a "free" and a "not-free" version) DBVisualizer Toad http://www.toadsoft.com/ Not-free Microsoft Visio - (If you already have it,... Continue Reading →

Oracle PL/SQL: Bulk Processing with BULK COLLECT and FORALL

Bulk Processing with BULK COLLECT and FORALL· BULK COLLECT: SELECT statements that retrieve multiple rows with a single fetch, improving the speed of data retrieval· FORALL: INSERTs, UPDATEs, and DELETEs that use collections to change multiple rows of data very quicklyPL/SQL is so tightly integrated with the SQL language, you might be wondering why special... Continue Reading →

Generic DataSource on CDHDR and CDPOS Tables

http://www.docfoc.com/generic-datasource-on-cdhdr-and-cdpos-tables

Pomiar wydajności bazy danych

Przy wyborze hostingu warto sprawdzić jak prezentuje się wydajność zakupionych serwerów może w tym pomóc skrypt http://www.linux.pl Po przeróbkach skryptu zainstalowałem go na serwerze http://ultimasolution.pl/projects/bechmark_phpmysql/?iterations=50000&tabletype=MYISAM i oto co wyszło: Testing a(n) MYISAM table using 50000 rows. Successfully created database speedtestdb Sucessfully created table speedtesttable This MySQL instance does NOT support MYISAM tables Table Type Verified:... Continue Reading →

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