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Index Compression – aargh
The problem with telling people that some feature of Oracle is a “good thing” is that some of those people will go ahead and use it; and if enough people use it some of them will discover a hitherto...
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Indexing LOBs
Many years ago, possibly when most sites were still using Oracle 8i, a possible solution to a particular customer problem was to create a function-based index on a CLOB column using the...
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Auto Sample Size
In the past I have enthused mightily about the benefits of the approximate NDV mechanism and the benefit of using auto_sample_size to collect statistics in 11g; however, as so often happens with Oracle...
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Duplicate database
One of the people attending my seminar in Munich last week has emailed me some details about a nasty little surprise you may get if you’re thinking about TSPITR (tablespace point in time recovery), and...
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12c Temporary
Just one of those little snippets to cover something new and remind of something old. A single session can now have three (or more) temporary tablespaces in use at the same time for different reasons....
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Temporary Segments
A question came up on oracle-l recently about identifying which temporary segment in v$tempseg_usage is associated with which global temporary table. Here’s my answer: v$tempseg_usage is a synonym for...
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RLS bug
RLS – row level security, aka VPD (virtual private database) or FGAC (fine grained access control) has a critical bug in 11g. The bug is unpublished, but gets mentioned in various other documents, so...
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RLS bug
RLS – row level security, aka VPD (virtual private database) or FGAC (fine grained access control) has a critical bug in 11g. The bug is unpublished, but gets mentioned in various other documents, so...
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Bigfiles
It’s always the combinations that catch you out. Bigfile tablespaces have their uses – especially in big systems Materialized views have their users – especially in big systems There’s absolutely no...
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Bigfiles
It’s always the combinations that catch you out. Bigfile tablespaces have their uses – especially in big systems Materialized views have their users – especially in big systems There’s absolutely no...
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