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…
View More APPEND_VALUES and SYS_DL_CURSOR Hints with HCC
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…
View More How to Increase MEMORY_TARGET
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…
View More PostgreSQL “bind variable peeking”
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…
View More Postgresql PREPARE — prepare a statement for execution
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…
View More Adaptive Cursor Sharing in Oracle Database 11g Release 1
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…
View More Partition an existing table on PostgreSQL
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…
View More Partitioning in Postgres, 2022 edition
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…
View More How to Swap SQL_Profiles?
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…
View More SQL Profiles in the Data Dictionary
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…
View More Useful Gather Statistics Commands In Oracle