SQL Server: Compare Database Tables/Indexes/Views/SP’s etc. For Differences Across Instances

There are a bunch of tools in the market to do the database comparisons for differences but if you want to do it for free (and programmatically)  at a basic level, you could use the method outlined below. For me, this came about as a result of an user asking "So, what is different between … Continue reading SQL Server: Compare Database Tables/Indexes/Views/SP’s etc. For Differences Across Instances

SQL Server: Identify And Defragment Indexes Using DBCC SHOWCONTIG & DBCC INDEXDEFRAG

Update Sep 7, 2018: This article uses deprecated commands. Please checkout this blog post on "Alter Index Vs DBCC IndexDefrag Vs DBCC DBReIndex". In the newer versions, I prefer ALTER INDEX although it has not been good at defragmenting in all cases. A good defrag script is worth its weight in gold. This time, I copied … Continue reading SQL Server: Identify And Defragment Indexes Using DBCC SHOWCONTIG & DBCC INDEXDEFRAG

Oracle – TRUNCATE vs DELETE – Spoiler: TRUNCATE Wins & Why? Hours vs Seconds!

Why DELETE is bad? In Oracle, when it comes to deleting  ** A L L **   the data from a table (clearing the contents of a staging table for example), using a DELETE statement is the most inefficient choice. Here are some reasons why DELETE is bad It uses UNDO It uses REDO It fires … Continue reading Oracle – TRUNCATE vs DELETE – Spoiler: TRUNCATE Wins & Why? Hours vs Seconds!

Oracle’s APPEND Hint – The Key Secret To Fast BULK Loading With NOLOGGING!

Oracle's logical storage structures: To developers who work with Oracle, the concept of tablespace is familiar.  We create tables and indexes in tablespaces taking appropriate care not to place all of our data into one tablespace. Let us take a quick look at the logical structure of an Oracle database A database has one or … Continue reading Oracle’s APPEND Hint – The Key Secret To Fast BULK Loading With NOLOGGING!

Oracle – Explain Plan Basics & Brief History

Whenever a SQL statement is submitted to the database server (be it Oracle or SQL Server), the server generates an execution plan which it uses to get the data in a well-defined order. The engine that does this work is called the “optimizer”. History of optimizers: RBO – Rule based optimizer Back in the day, … Continue reading Oracle – Explain Plan Basics & Brief History