# SQL Bridge Historical Scan

**URL:** <https://forum.inductiveautomation.com/t/sql-bridge-historical-scan/8593>\
**Category:** Ignition\
**Created:** [June 19, 2014, 6:57pm UTC](https://forum.inductiveautomation.com/t/sql-bridge-historical-scan/8593 "2014-06-19T18:57:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Juan\_Pablo\_Manson](https://avatars.discourse-cdn.com/v4/letter/j/8edcca/32.png) [@Juan\_Pablo\_Manson](https://forum.inductiveautomation.com/u/Juan_Pablo_Manson)\
**Post date:** [June 19, 2014, 6:57pm UTC](https://forum.inductiveautomation.com/t/sql-bridge-historical-scan/8593/1 "2014-06-19T18:57:40Z")

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Hi, I have a problem with SQL Bridge 5.3.4 and Vision Module 5.3.6  
I have defined a Scan Class call “Production” with mode Direct - Analog Type and Scan Rate 5000ms but the tags doesn’t historicizes with the given frequency, some tags si but others do not.  
More over, if I set up the Default Scan (real time) all the tags start to historicized but after a few minutes some tags stop their historicizing and I see the change of the tagvalue in the designer.

Thanks.