%Get() accepts a type parameter -- you can specify a type of stream and it will return a stream object, which is not limited by the max size of strings.

In the management portal you can view that under System Explorer >> Globals. From terminal you can use zwrite. In both cases, make sure you're in the correct namespace:

zwrite ^ztest

Have a look at square bracket syntax for referring to properties in the message. With it you can refer to (for example) OBX:3 and it will return the third field in every OBX segment as a single delimited string.

It's possible that your data set doesn't include the name Xiang. Run "zwrite ^Data" and choose a name to search for.

This piece from your code works for me:

set idx = ""
for {
    set idx = $o(^Data(idx)) quit:idx=""
    write !,"idx: "_idx
    write ^Data(idx, "name")
}

What response did you get?

You can query Ens_Config.Item on ClassName:

SELECT ID, Category FROM Ens_Config.Item WHERE ClassName = "EnsLib.HL7.Service.FileService"

But you'll want to keep in mind that a production can have multiple items that use the same class, so this query could return multiple rows all with different categories.

Category applies to the item as it is configured in the production, not to the underlying class it uses.

This is a great question. In your example you haven't created an index for name. But you can still find entries by name if you iterate through all of the entries.

You can do that like this:

set searchName="Xiang"

set id=""  
for {
    set id=$ORDER(^Data(id))  
    quit:id=""
    if ^Data(id,"name")=searchName {
        write ^Data(id,"surname"),":",^Data(id,"name"),":",^Data(id,"birthday"),!
    }
}

This gave me the output:

Kevin:Xiang:36411

The key command in this code is $ORDER. You'll definitely want to review the $ORDER documentation to understand what it is doing.

Another convenient utility is zwrite, which will allow you to see all of the entries you inserted in ^Data.

This is what it looks like if I run zwrite in the terminal:

DEMO> zwrite ^Data
^Data(1,"birthday")=44136
^Data(1,"name")="Murray"
^Data(1,"surname")="Nataliya"
^Data(2,"birthday")=33465
^Data(2,"name")="Black"
^Data(2,"surname")="Samantha"
^Data(3,"birthday")=49183
^Data(3,"name")="Lee"
^Data(3,"surname")="Liza"
^Data(4,"birthday")=44951
^Data(4,"name")="Ravazzolo"
^Data(4,"surname")="Quigley"
^Data(5,"birthday")=39369
^Data(5,"name")="Faust"
^Data(5,"surname")="Zoe"
^Data(6,"birthday")=31477
^Data(6,"name")="Gomez"
^Data(6,"surname")="Maria"
^Data(7,"birthday")=31574
^Data(7,"name")="Eagleman"
^Data(7,"surname")="Samantha"
^Data(8,"birthday")=62100
^Data(8,"name")="Ragon"
^Data(8,"surname")="Jose"
^Data(9,"birthday")=35228
^Data(9,"name")="Lee"
^Data(9,"surname")="Pam"
^Data(10,"birthday")=47920
^Data(10,"name")="Evans"
^Data(10,"surname")="Will"
^Data(11,"birthday")=63253
^Data(11,"name")="Rogers"
^Data(11,"surname")="Uma"
^Data(12,"birthday")=55410
^Data(12,"name")="Novello"
^Data(12,"surname")="Terry"
^Data(13,"birthday")=64002
^Data(13,"name")="Perez"
^Data(13,"surname")="Terry"
^Data(14,"birthday")=39783
^Data(14,"name")="Uberoth"
^Data(14,"surname")="Wolfgang"
^Data(15,"birthday")=46360
^Data(15,"name")="Zubik"
^Data(15,"surname")="Phyllis"
^Data(16,"birthday")=33271
^Data(16,"name")="Yang"
^Data(16,"surname")="Andrew"
^Data(17,"birthday")=40437
^Data(17,"name")="Zampitello"
^Data(17,"surname")="Martin"
^Data(18,"birthday")=46985
^Data(18,"name")="Orwell"
^Data(18,"surname")="Ralph"
^Data(19,"birthday")=42733
^Data(19,"name")="Waterman"
^Data(19,"surname")="Diane"
^Data(20,"birthday")=45346
^Data(20,"name")="Gold"
^Data(20,"surname")="Imelda"
^Data(21,"birthday")=37976
^Data(21,"name")="Frost"
^Data(21,"surname")="Richard"
^Data(22,"birthday")=41319
^Data(22,"name")="Koenig"
^Data(22,"surname")="Robert"
^Data(23,"birthday")=40915
^Data(23,"name")="Minichillo"
^Data(23,"surname")="Molly"
^Data(24,"birthday")=30632
^Data(24,"name")="Yang"
^Data(24,"surname")="Neil"
^Data(25,"birthday")=59938
^Data(25,"name")="Wilson"
^Data(25,"surname")="Wolfgang"
^Data(26,"birthday")=59897
^Data(26,"name")="Zampitello"
^Data(26,"surname")="Jules"
^Data(27,"birthday")=37417
^Data(27,"name")="Avery"
^Data(27,"surname")="Patricia"
^Data(28,"birthday")=46217
^Data(28,"name")="Edwards"
^Data(28,"surname")="Angelo"
^Data(29,"birthday")=64401
^Data(29,"name")="Humby"
^Data(29,"surname")="Clint"
^Data(30,"birthday")=44599
^Data(30,"name")="Nichols"
^Data(30,"surname")="Joe"
^Data(31,"birthday")=36633
^Data(31,"name")="Anderson"
^Data(31,"surname")="Zeke"
^Data(32,"birthday")=54905
^Data(32,"name")="Isaksen"
^Data(32,"surname")="John"
^Data(33,"birthday")=39307
^Data(33,"name")="Hanson"
^Data(33,"surname")="Heloisa"
^Data(34,"birthday")=55578
^Data(34,"name")="Jenkins"
^Data(34,"surname")="Filomena"
^Data(35,"birthday")=39818
^Data(35,"name")="Orlin"
^Data(35,"surname")="Nellie"
^Data(36,"birthday")=61299
^Data(36,"name")="Allen"
^Data(36,"surname")="Rob"
^Data(37,"birthday")=46647
^Data(37,"name")="Koivu"
^Data(37,"surname")="Mario"
^Data(38,"birthday")=61880
^Data(38,"name")="Winters"
^Data(38,"surname")="Al"
^Data(39,"birthday")=59597
^Data(39,"name")="Yoders"
^Data(39,"surname")="Nellie"
^Data(40,"birthday")=32317
^Data(40,"name")="Yoders"
^Data(40,"surname")="Stavros"
^Data(41,"birthday")=65110
^Data(41,"name")="Gallant"
^Data(41,"surname")="Umberto"
^Data(42,"birthday")=64331
^Data(42,"name")="Huff"
^Data(42,"surname")="Edward"
^Data(43,"birthday")=49679
^Data(43,"name")="Xavier"
^Data(43,"surname")="Barbara"
^Data(44,"birthday")=62300
^Data(44,"name")="Xander"
^Data(44,"surname")="Natasha"
^Data(45,"birthday")=38052
^Data(45,"name")="Quine"
^Data(45,"surname")="Brian"
^Data(46,"birthday")=45772
^Data(46,"name")="Mara"
^Data(46,"surname")="Nataliya"
^Data(47,"birthday")=61894
^Data(47,"name")="Lopez"
^Data(47,"surname")="Sally"
^Data(48,"birthday")=47017
^Data(48,"name")="Solomon"
^Data(48,"surname")="Jocelyn"
^Data(49,"birthday")=65868
^Data(49,"name")="Quigley"
^Data(49,"surname")="Ted"
^Data(50,"birthday")=46776
^Data(50,"name")="Gallant"
^Data(50,"surname")="Angelo"
^Data(51,"birthday")=45919
^Data(51,"name")="Rotterman"
^Data(51,"surname")="Juanita"
^Data(52,"birthday")=49368
^Data(52,"name")="Kratzmann"
^Data(52,"surname")="Neil"
^Data(53,"birthday")=36273
^Data(53,"name")="Lennon"
^Data(53,"surname")="Kirsten"
^Data(54,"birthday")=57894
^Data(54,"name")="Dunlap"
^Data(54,"surname")="Gertrude"
^Data(55,"birthday")=52763
^Data(55,"name")="Yakulis"
^Data(55,"surname")="Maria"
^Data(56,"birthday")=45293
^Data(56,"name")="Quigley"
^Data(56,"surname")="Wilma"
^Data(57,"birthday")=30457
^Data(57,"name")="Paladino"
^Data(57,"surname")="Jeff"
^Data(58,"birthday")=44654
^Data(58,"name")="Jafari"
^Data(58,"surname")="Patrick"
^Data(59,"birthday")=47310
^Data(59,"name")="Chadwick"
^Data(59,"surname")="Wolfgang"
^Data(60,"birthday")=32840
^Data(60,"name")="Orwell"
^Data(60,"surname")="Andrew"
^Data(61,"birthday")=46156
^Data(61,"name")="Quilty"
^Data(61,"surname")="Josephine"
^Data(62,"birthday")=63361
^Data(62,"name")="Zimmerman"
^Data(62,"surname")="Ted"
^Data(63,"birthday")=46049
^Data(63,"name")="Adams"
^Data(63,"surname")="Valery"
^Data(64,"birthday")=40616
^Data(64,"name")="Jafari"
^Data(64,"surname")="Jules"
^Data(65,"birthday")=31115
^Data(65,"name")="McCoy"
^Data(65,"surname")="Laura"
^Data(66,"birthday")=34784
^Data(66,"name")="Quilty"
^Data(66,"surname")="Elvis"
^Data(67,"birthday")=54016
^Data(67,"name")="Ingleman"
^Data(67,"surname")="Greta"
^Data(68,"birthday")=36432
^Data(68,"name")="Walker"
^Data(68,"surname")="Dick"
^Data(69,"birthday")=60717
^Data(69,"name")="Zampitello"
^Data(69,"surname")="Jose"
^Data(70,"birthday")=50594
^Data(70,"name")="DeSantis"
^Data(70,"surname")="Brendan"
^Data(71,"birthday")=33822
^Data(71,"name")="Anderson"
^Data(71,"surname")="Bart"
^Data(72,"birthday")=41826
^Data(72,"name")="Fripp"
^Data(72,"surname")="Molly"
^Data(73,"birthday")=30840
^Data(73,"name")="Ironhorse"
^Data(73,"surname")="Diane"
^Data(74,"birthday")=59455
^Data(74,"name")="Jaynes"
^Data(74,"surname")="Al"
^Data(75,"birthday")=42430
^Data(75,"name")="Chesire"
^Data(75,"surname")="Emily"
^Data(76,"birthday")=34392
^Data(76,"name")="Jenkins"
^Data(76,"surname")="Pam"
^Data(77,"birthday")=45341
^Data(77,"name")="Hanson"
^Data(77,"surname")="Sally"
^Data(78,"birthday")=54498
^Data(78,"name")="Nichols"
^Data(78,"surname")="Uma"
^Data(79,"birthday")=38272
^Data(79,"name")="Goncharuk"
^Data(79,"surname")="Zelda"
^Data(80,"birthday")=55832
^Data(80,"name")="Avery"
^Data(80,"surname")="Greta"
^Data(81,"birthday")=45135
^Data(81,"name")="Nagel"
^Data(81,"surname")="Michael"
^Data(82,"birthday")=42670
^Data(82,"name")="Quince"
^Data(82,"surname")="Terry"
^Data(83,"birthday")=35127
^Data(83,"name")="Jackson"
^Data(83,"surname")="Susan"
^Data(84,"birthday")=44011
^Data(84,"name")="Marks"
^Data(84,"surname")="Milhouse"
^Data(85,"birthday")=47140
^Data(85,"name")="Sato"
^Data(85,"surname")="Greta"
^Data(86,"birthday")=57187
^Data(86,"name")="Ingersol"
^Data(86,"surname")="Ted"
^Data(87,"birthday")=35111
^Data(87,"name")="West"
^Data(87,"surname")="Wilma"
^Data(88,"birthday")=60618
^Data(88,"name")="Braam"
^Data(88,"surname")="Greta"
^Data(89,"birthday")=45237
^Data(89,"name")="Klausner"
^Data(89,"surname")="Kyra"
^Data(90,"birthday")=51816
^Data(90,"name")="Eastman"
^Data(90,"surname")="Andrew"
^Data(91,"birthday")=63181
^Data(91,"name")="Nathanson"
^Data(91,"surname")="Robert"
^Data(92,"birthday")=56444
^Data(92,"name")="Newton"
^Data(92,"surname")="Mo"
^Data(93,"birthday")=33670
^Data(93,"name")="Xavier"
^Data(93,"surname")="Brenda"
^Data(94,"birthday")=60262
^Data(94,"name")="Ironhorse"
^Data(94,"surname")="Josephine"
^Data(95,"birthday")=51967
^Data(95,"name")="Klingman"
^Data(95,"surname")="Ralph"
^Data(96,"birthday")=40383
^Data(96,"name")="Donaldson"
^Data(96,"surname")="Stuart"
^Data(97,"birthday")=50563
^Data(97,"name")="Wells"
^Data(97,"surname")="Clint"
^Data(98,"birthday")=52105
^Data(98,"name")="Leiberman"
^Data(98,"surname")="Rhonda"
^Data(99,"birthday")=36713
^Data(99,"name")="Lepon"
^Data(99,"surname")="Laura"
^Data(100,"birthday")=36411
^Data(100,"name")="Xiang"
^Data(100,"surname")="Kevin"

Next, if you want to add an index on name, you can add entries for each name with a reference to every id that has that name. In the global, it could look like this:

set ^DataIndex("name","Xiang",100)=""
set ^DataIndex("name","Xiang",123)=""

You could then use $ORDER again to iterate through all entries with the name of Xiang:

set id=""
for {
   set id=$ORDER(^DataIndex("name","Xiang",id))
   quit:id=""
   write "ID:",id," has the name Xiang",!
}

Of course, this is all very manual. Modern applications usually define classes that represent a SQL table. The table/class will specify an index on a column, and Caché will create and maintain that index automatically.

Category is indeed stored in Ens.Config.Item.

You can access it through SQL:

SELECT Category from Ens_Config.Item

Or using objects:

DEMO>set confItem=##class(Ens.Config.Item).%OpenId(316)

DEMO>write confItem.Category
Test1