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dineshgowda.com | ||
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postgrespro.com
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| | | | | In previous articles we discussed query execution stages and statistics . Last time, I started on data access methods, namely Sequential scan . Today we will cover Index Scan. This article requires a basic understanding of the index method interface. If words like "operator class" and "access method properties" don't ring a bell, check out my article on indexes from a while back for a refresher. Plain Index Scan Indexes return row version IDs (tuple IDs, or TIDs for short), which can be handled in one of... | |
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pganalyze.com
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| | | | | Explore Postgres VACUUM with the VACUUM Simulator, a new playground feature that pganalyze introduce. | |
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timilearning.com
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| | | | | Have you ever wondered how data stored in databases actually gets represented on your computer's hard disk? Or why some queries to your database tables benefit from adding indexes on columns? Well, whether you have or not, here's a series of posts that aim to detail my understanding of the journey from inserting a row to a database table, to actually retrieving that row. | |
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carlschwan.eu
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| | | One design characteristic of our QtWidgets is that they contain a lot of frames and frames inside other frames. This worked well with Oxygen style and its skeuomorphism shadow, less so with Breeze. I first thought this was inheriten with QtWidgets and couldn't be fixed without much effort. But fortunately, after looking a bit into Qt source codes and in particular in the internals of QDockAreaLayout, I discovered that the engine to draw and style the built-in components of QtWidgets: QStyle has a QStyle::PE_IndicatorDockWidgetResizeHandle primitive which allows drawing separators between detachable docks and similarly there is QStyle::CE_Splitter to paint the separator between elements inside a QSplitter. This is huge because this means instead of drawing frames, we can render separator and then get rid of most of our frames in our apps. | ||
