# No scan class information found for tags

**URL:** <https://forum.inductiveautomation.com/t/no-scan-class-information-found-for-tags/9814>\
**Category:** Ignition\
**Created:** [March 18, 2015, 3:12pm UTC](https://forum.inductiveautomation.com/t/no-scan-class-information-found-for-tags/9814 "2015-03-18T15:12:54Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Serhii](https://avatars.discourse-cdn.com/v4/letter/s/df788c/32.png) [@Serhii](https://forum.inductiveautomation.com/u/Serhii)\
**Post date:** [March 18, 2015, 3:12pm UTC](https://forum.inductiveautomation.com/t/no-scan-class-information-found-for-tags/9814/1 "2015-03-18T15:12:54Z")

</div>

Hello!  
I have some errors in the console and i dont know how to fix it.

```auto
(D)	17:06:17	History.SQLTags.QueryResultWriter	(id=65e30a68) 5001 additional rows where written as part of the dataset finalization, and took 21 ms.
(D)	17:06:17	History.SQLTags.QueryResultWriter	(id=65e30a68) Write of 0 rows (created from 0 datapoints) took 2 ms. More rows may be written to fill in requested result size.
(D)	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) Finished loading data values.
(D)	17:06:17	History.SQLTags.PartitionManager.TetrapakDB_PMgr	(id=65e30a68) Partition query returning result set: [] Query: 'SELECT `pname`, `start_time`, `end_time`, `blocksize`, `flags` FROM sqlth_partitions WHERE `drvid`=? and `start_time`<=? and `end_time`>=? and (`blocksize` is NULL or `blocksize`<=?) ORDER BY `start_time` ASC' Params: [[1, 1264290620537, 1264287020537, 720]]
(D)	17:06:17	History.SQLTags.QueryResultWriter	(id=65e30a68) Result dataset initialized with the following columns/data types: [[t_stamp, [TetrapakDB]Cooling/HM3/PercentTotalCapacityNew, [TetrapakDB]Cooling/HM2/PercentTotalCapacityNew, [TetrapakDB]Cooling/HM1/PercentTotalCapacityNew]]/[[class java.sql.Timestamp, class java.lang.Long, class java.lang.Long, class java.lang.Long]]
(D)	17:06:17	History.SQLTags.QueryResultWriter	(id=65e30a68) Using block window size of 720 ms [720 ms].
WARN	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) No scan class information found for tags. All returned data will be bad quality.
(D)	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) Loaded 0 of 0 post values in 1 ms. Values: []
(D)	17:06:17	History.SQLTags.PartitionManager.TetrapakDB_PMgr	(id=65e30a68) Partition query returning result set: [] Query: 'SELECT `pname`, `start_time`, `end_time`, `blocksize`, `flags` FROM sqlth_partitions WHERE `drvid`=? and `start_time`<=? and `end_time`>=? and (`blocksize` is NULL or `blocksize`<=?) ORDER BY `start_time` ASC' Params: [[1, 1264290620537, 1264290620537, 0]]
(D)	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) Loaded 0 of 0 seed values in 1 ms. Values: []
(D)	17:06:17	History.SQLTags.PartitionManager.TetrapakDB_PMgr	(id=65e30a68) Partition query returning result set: [] Query: 'SELECT `pname`, `start_time`, `end_time`,`blocksize`, `flags` FROM sqlth_partitions WHERE `drvid`=? and `start_time`<? and (`blocksize` is NULL or `blocksize`<=?) ORDER BY `end_time` DESC LIMIT 2' Params: [[1, 1264287020537, 0]]
(D)	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) Tag info loaded for 'cooling/hm2/percenttotalcapacitynew'. Values: []
(D)	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) Tag info loaded for 'cooling/hm1/percenttotalcapacitynew'. Values: []
(D)	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) Tag info loaded for 'cooling/hm3/percenttotalcapacitynew'. Values: []
(D)	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) Tag information took 1 ms to load. Registered 3 ids for 3 tag paths.
(D)	17:06:17	History.SQLTags.DataLoader.TetrapakDB_Loader	(id=65e30a68) Initializing history loader. Data source: 'TetrapakDB' System: 'Tetrapak' Driver id: '1' Read seed values: 'true'
(D)	17:06:17	History.SQLTags	(id=65e30a68) Starting history query for 3 tag(s). Parameters: [2010-01-24 00:50:20.537 -> 2010-01-24 01:50:20.537, 5000 points, 'MinMax', 'Wide'] Tags: [[[TetrapakDB]Cooling/HM3/PercentTotalCapacityNew, [TetrapakDB]Cooling/HM2/PercentTotalCapacityNew, [TetrapakDB]Cooling/HM1/PercentTotalCapacityNew]] Aliases: []
```

Old tags was “PercentTotalCapacity” and i tried to delete them and created “PercentTotalCapacityNew”. Problem still happens.

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<div class="post-metadata">

**Author:** ![Serhii](https://avatars.discourse-cdn.com/v4/letter/s/df788c/32.png) [@Serhii](https://forum.inductiveautomation.com/u/Serhii)\
**Post date:** [March 18, 2015, 3:13pm UTC](https://forum.inductiveautomation.com/t/no-scan-class-information-found-for-tags/9814/2 "2015-03-18T15:13:28Z")

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This error shows every 1 sec.