Oracle Database compresses data during all DML operations on the table. You will get no compression benefits from conventional path inserts, updates or deletes. Or if video is more your thing, check out Connor's latest video and Chris's latest video from their Youtube channels. Classes, workouts and quizzes on Oracle Database technologies. This document is focused solely on OLTP Compression which is one of several types of heap segment compression (HSC), the other features of the Advanced Compression Option as listed above are not covered here. This form of compression is recommended for OLTP environments. In the above explanation can you mention why was the blocks space not got released even though the table is compressed what could be done to release the blocks, Is this answer out of date? Enhancement has been logged to request the possibility to disable/un-install the option. The strategies I used in the original article were: 1. When a table is set to use OLTP compression and rows are inserted into a new block in that table they are inserted uncompressed, just as with a non-compressed table. Answered by: Connor McDonald - Last updated: August 16, 2017 - 11:58 am UTC. NOTE: Currently Advanced Compression cannot be disabled. ALTER TABLE sales MERGE PARTITIONS sales_q1_1998, sales_q2_1998 INTO PARTITION sales_1_1998 TABLESPACE ts_arch_1_1998 COMPRESS FOR OLTP UPDATE INDEXES; For more details and examples for partition management operations, refer to Partition Administration . In earlier releases, OLTP table compression was enabled using COMPRESS FOR ALL OPERATIONS. OLTP Table Compression, therefore, extends the benefits of compression to all application workloads. Create table as select from all_obje… It is designed for use with direct path loads only. * When you enable table compression by specifying either COMPRESS or COMPRESS BASIC, you enable basic table compression. Compressing securefile columns have different syntax, syntax that specifiles compression within the LOB clause. We’ll start by creating a table with 50,000 rows selected from view all_objects, and check to see if different strategies produce different results. The Oracle11g Advanced Compression Option includes OLTP Compression, SecureFiles Deduplication and Compression (LOBs), Recovery Manager Compression, Data Pump Compression, and DataGuard redo compression. COMPRESS FOR ALL OPERATIONS - This option is considered suitable for OLTP systems. If a table contains LOB columns then it is possible to compress table only  without compressing the LOB data. Note that Hybrid Columnar Compression has specific requirements for underlying storage including Exadata, ZFS, or Pillar. Oracle Database attempts to compress data during direct-path INSERT operations when it is productive to do so. And of course, keep up to date with AskTOM via the official twitter account. 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