Sometimes it is required to flush the BAD SQL_PLAN from shared_pool so that new (or old) better execution plan can be picked by SQL_ID 1)…
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Month: April 2023
Postgres — Live Table Partitioning
the partitioning of 1TB of data on a live system, with zero downtime Summary A few months ago we faced an engineering challenge of having…
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Partitioning Existing Tables in Postgres
So, your database is growing rapidly, as, ideally, is your business. The problem is, its performance is getting worse. You’re starting to wonder whether partitioning…
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Oracle CBO is ignoring SYS_DL_CURSOR
Some days ago i came across with a pl/sql code where they used (for some reason) an Oracle hint called SYS_DL_CURSOR. I got it when i…
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APPEND_VALUES and SYS_DL_CURSOR Hints with HCC
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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