Oracle SQL
  • LICENSE

Tracing Hybrid Columnar Compression in an offload server

Posted on May 4, 2017 by Roger MacNicol Posted in cell_offload, oracle, SmartScan, trace 1,666 Page views 3 Comments

I had previously commented on how to use the FPLIB facility in a trace event but the question came up today of how to trace HCC in an offload server.  The facility name in this case is ADVCMP (Advanced Compression) and the hierarchy is:

ADVCMP_MAIN
    ADVCMP_COMP
    ADVCMP_DECOMP

No compression occurs on the cell so we are only interested in the decompression tracing in an offload server.

So in this case the correct syntax is [facility.event] so: 

cellcli -e 'alter cell offloadgroupEvents = "trace[advcmp.advcmp_decomp.*] disk=lowest"'
oracle Roger MacNicol SmartScan traces troubleshooting
« Using trace events with an offload server
More on tracing the offload server »
Page views: 1,666
photo Sayan Malakshinov

Oracle ACE Pro Oracle ACE Pro Alumni

DEVVYOracle Database Developer Choice Award winner

Oracle performance tuning expert

UK / Cambridge

LinkedIn   Twitter
sayan@orasql.org

Recent Posts

  • Oracle Telegram Bot
  • Partition Pruning and Global Indexes
  • Interval Search: Part 4. Dynamic Range Segmentation – interval quantization
  • Interval Search Series: Simplified, Advanced, and Custom Solutions
  • Interval Search: Part 3. Dynamic Range Segmentation – Custom Domain Index

Popular posts

Recent Comments

  • Oracle SQL | Interval Search: Part 4. Dynamic Range Segmentation – interval quantization on Interval Search: Part 3. Dynamic Range Segmentation – Custom Domain Index
  • Oracle SQL | Interval Search: Part 4. Dynamic Range Segmentation – interval quantization on Interval Search: Part 2. Dynamic Range Segmentation – Simplified
  • Oracle SQL | Interval Search: Part 4. Dynamic Range Segmentation – interval quantization on Interval Search: Optimizing Date Range Queries – Part 1
  • Oracle SQL | Interval Search Series: Simplified, Advanced, and Custom Solutions on Interval Search: Part 2. Dynamic Range Segmentation – Simplified
  • Oracle SQL | Interval Search: Part 2. Dynamic Range Segmentation – Simplified on Interval Search: Part 3. Dynamic Range Segmentation – Custom Domain Index

Blogroll

  • Alex Fatkulin
  • Alexander Anokhin
  • Andrey Nikolaev
  • Charles Hooper
  • Christian Antognini
  • Coskan Gundogar
  • David Fitzjarrell
  • Igor Usoltsev
  • Jonathan Lewis
  • Karl Arao
  • Mark Bobak
  • Martin Bach
  • Martin Berger
  • Neil Chandler
  • Randolf Geist
  • Richard Foote
  • Riyaj Shamsudeen
  • Tanel Poder
  • Timur Akhmadeev
  • Valentin Nikotin
©Sayan Malakshinov. Oracle SQL