Every time I work on database migrations with GoldenGate, I have the same talks with application teams about missing primary keys. Especially when it comes to LOB replication with GoldenGate. In a previous blog, I wrote about how to interpret the DBA_GOLDENGATE_NOT_UNIQUE view, which lists tables with no primary key or non-null unique indexes. There are two main groups of…
GoldenGate is a powerful replication tool, but it is so versatile that you should always check whether what you intend to do is supported or not. Oracle provides a few interesting scripts and views to check your environments before attempting a replication with GoldenGate, and I wanted to write about the DBA_GOLDENGATE_NOT_UNIQUE view. Before explaining what this view contains and…
By Franck Pachot . Storing documents within the database is the easiest, especially because you get them consistent with the metadata stored in the database. If you store them externally, then you need to manage their backup, their synchronization to standby site, the consistency in case of flashback or PITR, etc. However, documents grow (in number and in size thanks…
By Franck Pachot . 12c has introduced character strings that can can go above 4000 bytes. In the previous versions, in PL/SQL only we were allowed to have VARCHAR2 up to 32k. In SQL the VARCHAR2 datatype was limited to 4000 and CHAR was limited to 2000. That became a bit small especially when lot of applications needed to store…
LOBs (Large OBjects) first appeared in Oracle 7 and were created to store large amount of data such as document files, video, pictures, etc. Today, we can store up to 128 TB of data in a LOB, depending on the DB_BLOCK_SIZE parameter settings. In this posting, I will show you how to load LOB files into the Oracle database and…
Last week by a customer, we experienced an excessive redo log generation filling up rapidly the FRA (Flash/Fast Recovery Area) with archivelog files which caused the database to crash.
Le stockage des LOB est souvent négligé lors de la création des tables. Hors les choix de stockage ont un impact sur la performance d’accès aux données. nous allons voir rapidement dans cet article l’avantage à utiliser le stockage SecureFiles proposé par Oracle à partir de la version 11gR1.
