Oracle

Large Pages and MEMORY_TARGET on Windows

By Franck Pachot . In a previous post about enabling large page on Windows Server, I explained that it's possible to use large pages with Automatic Memory Management (AMM, where sizing if SGA and PGA is(…)

Redo log block size on ODA X6 all flash

By Franck Pachot . On the Oracle Database Appliance, the redo logs are on Flash storage (and with X6 everything is on Flash storage) so you may wonder if we can benefit from 4k redo blocksize. Here are some tests(…)

AMM and ASMM derived parameters

By Franck Pachot . The latest DBA Essentials Workshop training I've given raised a question about PGA_AGGREGATE_LIMIT. The default depends on PGA_AGGREGATE_TARGET. So how is it calculated in AMM where PGA_AGGREGATE_TARGET is dynamic? Is it also(…)

Oracle Public Cloud patch conflict

By Franck Pachot . This morning I wanted to test a patch (18633374) in the Oracle Cloud Service. The DBaaS was created as an 'Enterprise Edition Extreme Performance' which comes with all options, including multitenant option. I applied my patch.

Nulls in composite keys

By Franck Pachot . Comparison of NULL can be misleading and it's even worse for unique constraint validation. Having partial nulls in a composite key can be tricky because the SQL ANSI specification is not very easy to understand, and(…)

Compare source and target in a Dbvisit replication

By Franck Pachot . You've setup a logical replication, and you trust it. But before the target goes into production, it will be safer to compare source and target. At least count the number of rows. But tables are continuously(…)

Script to suggest FK indexes

By Franck Pachot . In Oracle, when the referenced key is deleted (by delete on parent table, or update on the referenced columns) the child tables(s) are locked to prevent any concurrent insert that may reference the old key. This(…)

GoldenGate 12.2 – Installation of the monitoring agent

As described in my last post, GoldenGate Studio requires the monitor agent on each GoldenGate instance. The goal of this agent is to allow GoldenGate Studio to interact with GoldenGate, for example, to(…)

Question is: upgrade now to 12.1.0.2 or wait for 12.2 ?

By Franck Pachot . Let's look at Release Schedule of Current Database Releases (Doc ID 742060.1) 12.2.0.1 is planned for 2HCY2016 on platforms Linux x86-64, Oracle Solaris SPARC (64-bit), Oracle Solaris x86-64 (64-bit). 2HCY2016 starts next(…)

ODA X6-2S and ODA X6-2M for EE and SE2

By Franck Pachot . After the announcement of the death of SE1 and SE we wondered what Oracle will do for Small and Medium Enterprises and entry level products. The answer was postgres the Oracle Cloud Services, but that's for(…)