The APPEND_VALUES hint was introduced in 11.2 to allow direct path inserts with variables using the VALUES clause. i.e. INSERT INTO XYZ (COL1, COL2) VALUES…
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Author: Bulent Soylu
How to Increase MEMORY_TARGET
Before you can increase memory in oracle database, you must first understand four oracle memory parameters which govern the instance. SGA_TARGET and SGA_MAX_SIZE MEMORY_TARGET and…
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PostgreSQL “bind variable peeking”
custom vs. generic plans With my Oracle database background, I know how important it is to balance the pros and cons of using bind variables…
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Postgresql PREPARE — prepare a statement for execution
Synopsis PREPARE name [ ( data_type [, …] ) ] AS statement Description PREPARE creates a prepared statement. A prepared statement is a server-side object that…
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Adaptive Cursor Sharing in Oracle Database 11g Release 1
DBAs are always encouraging developers to use bind variables, but when bind variables are used against columns containing skewed data they sometimes lead to less…
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Partition an existing table on PostgreSQL
Release after release PostgreSQL is better and better on table partitioning, if you do run a version12 or 13 today you must have a look…
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Partitioning in Postgres, 2022 edition
Partitioned tables aren’t an everyday go to, but are invaluable in some cases, particularly when you have a high volume table that’s expected to keep…
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How to Swap SQL_Profiles?
The central idea behind “swapping” SQL profiles is simple. You define a SQL profile that specifies the SQL statement that you want to tune, and an…
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SQL Profiles in the Data Dictionary
In the paper SQL Profiles (page 22) I described the data dictionary tables where the hints belonging to SQL profiles are stored. For example, with the following…
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Useful Gather Statistics Commands In Oracle
This article contains all the useful gather statistics related commands. 1. Gather dictionary stats: — It gathers statistics for dictionary schemas ‘SYS’, ‘SYSTEM’ and other…
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