Read or Repeatable read or committed read with a shared table lock. This – don’t forget to update statistics), the isolation mode must be dirty Must be larger than the buffer pool (note this implies that the optimizer knows To enable a light scan the table to be read Times faster than a traditional sequential scan. Pools which do not have the same associate overhead, they are typically 1-4 Insert, update and select statements, the row in question is read from theĭoing an insert the row to be inserted is placed into, potentially, the sameĮntire table or large quantities of inserts this can flood the buffer withĭata, and implies substantial overhead to manage.Ī light scan avoids this by using it’s own set of buffer When doing traditional reads or writes to a table using the Stores information on the error within the row. Tables are created, one which stores the row in question and another which Table xxx' and enable logging to them using the "set [constraints | You can create them using the SQL command `start violations for Inserted into the table due to violations such as uniqueness or tableĬonstraints. 'These are tables which store rows that could not be That you use one of the parallel loaders anyway. You may get around this when writing to tape,īut if you are dealing with that much data in a table it is highly recommended Limitation when dealing with output or input files. With the exception of the parallel loaders (HPL and Ploader) all of these utilities are subject to the 2GB Provide some concept of expected performance. These load rates are intended to be compared to one another and to *MUST* be programmed, 2GBĭatabases support violations tables which can handle most errors, see the topic Performance does not exceed dbload, load, etc. NotĮxtremely powerful data massaging capability. Not distributed by Informix, 2GB LimitĢGB file size limits. Entire databaseĭoes not lock the database on unloads. More complex, requires programming, 2GB Limitĭoes not retain database info, 2GB limit per table. Matrix to describe where each loader is most effectiveĭiscussion of issues involved with loading and unloading dataĪppendix of examples which will be added to as time goes by. ![]() This section of the FAQ is organized into: Point on your road to understanding this topic and a roadmap of where to visit This is not meant to be a definitive document definingĮverything there is to know about the subject. Than admit that they had anything to do with this: Jay Aymond, “Obnoxio The Clown”, Andrew Hamm,Īrt Kagel, Jonathan Leffler, Jack Parker (editor), David Williams (FAQ owner). The following individuals would rather slit their throats Note, for simplicity these facilities will herein be
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