Overview
Use the stream attributes properties tab to specify the characteristics of the the data in a table column.
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| Field | Description | ||||||||||
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| Indexed |
To improve performance, index an attribute when the stream has a large data set and an output pipe from the stream uses this attribute to:
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| Filter conditions are case-independent by default |
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| Key |
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| Cache Key | Enter an expression to be evaluated for each stream item (data record) in the stream. The expression can
Once calculated, the cache key value persists throughout subsequent stream calculation, rather than being created from scratch for each stream item as normal. This allows you to keep track of the calculation as it progresses. This means you can use a "persistent" attribute value in other expressions. CHECK THIS |
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Which fields can have "null"?
String
Apply a string type to sequences of characters (i.e., letters, numerals, symbols and punctuation marks). By default string attribute types have a fixed length of 50. The minimum length is 1 and the maximum length is 4000.
do we need to tell users about any information-loss if data that is naturally a different type gets loaded as a string?
Anchor Bigstring Bigstring
Bigstring
| Bigstring | |
| Bigstring |
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The maximum bigstring size can be configured in System Configuration → System Tuning → Maximum Bigstring Size.
Integer
Apply an integer type to whole numbers (not a fractions or decimals) that can be positive, negative, or zero.
What happens if you attempt to load a float or decimal number into an integer attribute? If you store a number with decimal places as an integer it will be truncated.
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- the international standard format has not separators and is yyyyMMdd, for example 20190214.
- the following variations (examples shown with space separators).
| 14 02 2019 | 14 Feb 2019 | 02 14 2019 | Feb 14 2019 |
|---|---|---|---|
| dd/MM/yyyy | dd-MMM-yyyy | MM/dd/yyyy | MMM/dd/yyyy |
| dd-MM-yyyy | dd/MMM/yyyy | MM-dd-yyyy | MMM-dd-yyyy |
| dd MM yyyy | dd MMM yyyy | MM dd yyyy | MMM dd yyyy |
| MM d yyyy | MMM d yyyy | ||
| 14 02 19 | 14 Feb 19 | 02 14 19 | Feb 14 19 |
| dd/MM/yy | dd/MMM/yy | MM/dd/yy | MMM/dd/yy |
| dd MM yy | dd-MMM-yy | MM-dd-yy | MMM-dd-yy |
| dd-MM-yy | dd MMM yy | MM dd yy | MMM dd yy |
| MM d yy | MMM d yy |
Datetime
Apply a datetime type to representations of a day and a time. It cannot be used to represent a time alone.
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The international datetime uses a full stop/period as a separator between the date and time, yyyyMMdd.HHmmss, for example 20190214.15:35:06.
| Note |
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PhixFlow recognises date and date-time formats, but does not recognise time-only formats, for example HH:mm:ss. When a collector loads time data, it applies the string data-type to times. |
Graphic
Is this still available?
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