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Status Delivered
Workspace Informix
Components Informix Server
Created by Guest
Created on Apr 18, 2017

temp Dbspace in RAM

We make high use of temp. Tables in our applications. With todays hardware availability it seems reasonable to me to hold the complete tmp. dbspace in the RAM (or RAMDISK). Unfortunately this is not supported by Informix IDS directly.

Advantages of this solution are IMHO:

* Performance of temp tables
* Reduce writes to SSD
* Other informix users have similar needs (Headline: Only in-memory temp table ID: 54307)
  • Admin
    Karen Qualley
    Jun 12, 2019

    Thanks for the input on this!

  • Guest
    Jun 12, 2019

    I would add that in v14.10 the chunk file for a temp dbspace no longer has to have proper reserved pages. The engine will recreate the temp dbspace at startup. The file just has to exist. From the v14.10 documentation:

    Whenever you start the database server, all chunks in temporary dbspaces are recreated from scratch. These chunks can therefore be located on RAM drives if desired.

    So essentially this one is done.

  • Guest
    Jan 16, 2019
    1. Note that you CAN do this.
    2. Create one or more RAM disks
    3. Create a "chunk" file on each RAM disk.
    4. Create a temp dbspace using each RAM disk chunk file.
    5. Shutdown the instance.
    6. Copy the chunk files to permanent storage (you can gzip/bzip2 the files down to a few KB since they will be empty except for the reserved pages.
    7. Restart the instance. 

    Now you can have your startup scripts do the following:

    1. Recreate the RAM drives
    2. Copy the saved file images back to the correct RAM drives (uncompressing if needed)
    3. Start the Informix instance.

    This even works if the server's host crashes since the engine assumes anything left in temp spaces is not needed and clears them out anyway on startup.