Is there a cross-platform way to compare data in one columnd on each sitde of replicated data, like a checksum or hash?

I have an Oracle 12 database with lots of tables, and I am replicating several of the tables (a subset of rows) into a SQL Server 2016 database. The subset of rows can be established with a WHERE clause on the Oracle side.

I have two web services that can expose anything I want to from that data, one on each side.

Do you have a suggestion for an approach of what I can expose, then compare to find out if the data between the systems matches?

I am currently exposing from one table, which has a few million rows the COUNT(*), which is a no-brainer since it is very efficient. So far, so good.

I’m also exposing the SUM of each of a few NUMBER(18,2) columns and comparing it to the corresponding SUM on the SQL Server side. However, this is problematic, as it has to scan the whole table in SQL Server; it is sometimes blocked, and sometimes might cause other processes to block. I imagine similar problems could occur on the Oracle side too.

Also, the SUM will not tell me if the rows match–it will only tell me that the totals match; if an amount was improperly added to one row and subtracted from another, I wouldn’t catch it.

I’ve pondered whether Oracle’s STANDARD_HASH might help me, but it seems cumbersome or error-prone to try to generate the exact same HASH on the SQL Server side, and also this doesn’t help with the inefficiency/blocking nature of the call.

So is there any way to have both databases keep track of a hash, checksum, CRC code, or other summary of a column’s data, that is efficient to retrieve, and that I can then use to compare to have some idea whether data is the same on both sides? It need not be a perfect solution–for example, comparing SUMs is close but perhaps not quite good enough.

As a first stab, I created an "summary" indexed view, with columns derived from SUMs, on the SQL Server side. This makes querying the view very fast, but incurs additional penalty on every write to the large table underneath. Still, I think it will work, but I’d like to improve on it. Other, better ideas?

What factors of the integer dataset being sorted can I change, in order to compare two sorting algorithms?

I am comparing two comparison and binary data structure based sorting algorithms, the Tree Sort, and the Heap Sort. I am measuring the time taken for both algorithms to sort an increasing size of an integer dataset. However, I am wondering if there are any other variables which I can modify, for example standard deviation, in the integer dataset itself that would be of any benefit to my comparison.

Online Fax Services Comparison – Why You Should Always Compare Before Buying

We have all been there, bought a produc  ARGENTINA FAX BROADCAST LIST or service only to find out later that it did not measure up to our expectations. Most times if we’re lucky, the purchased item can be returned and we are fully refunded. However, we have still wasted a lot of time and if you’re running a business, time means money. That’s why everyone should make it their own personal policy to totally compare and research a service or product before they buy.
That goes doubly true for a long term service like online fax. Usually, once you have received your fax number and start sending it out to all your contacts, you have made a commitment of sorts to having the service long term. You simply must do a little homework to make sure you get a service or provider that won’t disappoint you or your company down the road. Now that we have the Internet, that’s relatively very easy to do.
For those who are new to these types of services, it should be stated that Internet or online fax is simply using your present email account and your web connection to do all your faxing. You get a local or toll-free number which is connected to your email address, once you get a fax, you receive an email with the fax attached. Basically, you’re hiring the services of an online provider who will handle all your faxes in exchange for a small monthly fee. These web based fax services are paperless, very efficient, totally portable and much cheaper than conventional methods of faxing.
While some services do let you “port” your fax number, it’s best to pick the right provider the first time around. So you need to do your due diligence and carefully examine the different plans and different providers to meet your needs. One simple way to approach this problem is to just compare the different providers. Just compare some basic factors of each provider on your list to come up with the one best suited to meet your needs.
These factors would include: quality of the overall service, pricing, overage fees, amount of online storage, length of storage, support hours, number of email addresses, any hidden fees, set-up fees, corporate plans or services and whether or not the service has a free trial? All valid questions you should ask before signing up to any one of these providers.

Article Source:

How do I compare these ranges of numbers efficiently?

I’m looking for an efficient way of testing eights. What happens is I need to check if a value is eights and discard it.

The numbers I need to check for are:

8.8888, 88.888, 888.88, 8888.8, 88888.00                // 5 digits 88.8888, 888.888, 8888.88, 88888.8, 888888.00           // 6 digits 888.8888, 8888.888, 88888.88, 888888.8, 8888888.00      // 7 digits 8888.8888, 88888.888, 888888.88, 8888888.8, 88888888.00 // 8 digits 

However, these are actually represented in integer form. Which is the number multiplied by 10000.

So 8.8888 is represented as an int64 with the value 88888, and 888888.00 is represented as 888880000

There are quite a few values here to check. My simple approach was to just compare each one directly from a table. But then I thought perhaps I should maybe do something more efficient like masking and comparing each digit. But my crude approach did not work. It seems cumbersome and potentially a bit slow to convert to a string and compare eights that way. This code will run on an embedded system which checks these values many times over so I do need it to be reasonably performant. Note that I won’t have less than 5 digits represented or more than 8.

Compare function to give a GArray when filled with GString – Glib [closed]

i have a GArray with GString. My compare function goes as follows:

int compareProdutos (gconstpointer a, gconstpointer b) {     char* cast_a_pointer =  ((GString*) a)->str;     char* cast_b_pointer = ((GString*) b)->str;      return strcmp(cast_a_pointer,cast_b_pointer); } 

but it isn’t sorting the array and is in fact, giving random results as the GArray ordering changes every time i run this code. If i understand correctly, i need to give the strcmp function the “String” part of the GString and that is achieved by Gstring->str, so i’m not understanding what i’m doing wrong.

Why do we use the number of compares to measure the time complexity when compare is quite cheap?

I think one reason a compare is regarded as quite costly is due to the historical research as remarked by Knuth, that it came from tennis match trying to find the second or third best tennis player correctly, assuming the tennis players are not a “rock paper scissors” situation (but has an “absolute ‘combat’ power”).

If we have an array of size n being 1,000,000, we don’t usually mind comparing 2,000,000 times to find the second largest number. With the tennis tournament, having a Player A match with Player B can be costly as it can take a whole afternoon.

With sorting or selection algorithms, for example, what if the number of comparisons can be O(n log n) or O(n), but then, other operations had to be O(n²) or O(n log n), then wouldn’t the higher O() still override the number of comparisons? (Maybe it didn’t happen yet, or else we would have a study case about this situation). So ultimately, shouldn’t the number of atomic steps, instead of comparisons, measured by the order of growth as compared to n (O()) that determines the time complexity?

AnyDice compare dice roll value to number on a multidice roll

I’ve been trying to use AnyDice to calculate some stuff and got completely overwhelmed (never used it properly before).

I’m trying to do something along the lines of:

Roll n + p amount of d10 dice. If any of those result in 1, check for each 1 roll 1d10 + p.

In this sequence I’m trying to see what are the odds that at least one of the dice will result in 1 and what would the secondary roll result spread would be.

Is it possible to do something like this? Because I’m already failing at trying to compare the dice to a number and assigning variables does not seem to help. I think I jumped into something too complex for a first more serious use of the system.

EDIT: Basically the first roll is for casting a spell and 1s represent mishaps. For each 1 you roll onto table which has 10 entries (the higher the number, the more severe result). Adding extra dice p (pushing) makes those table results worse. I want to see how quickly and how bad that can go. If I add 1 extra die, what’s the chance to get a mishap and how bad, if i add 2, etc (apologies if too much details, not sure how else to clarify this).

So far I managed to count number of 1s (i think)

function: hitme N:n plus P:n {   X: N + P   result: [count {1} in X d10] } output [hitme 4 plus 2] 

How do the various DND-5e character sheet apps compare? [closed]

I’m thinking about having my players use apps to keep track of their characters since they’re kind of new. How do the available character sheet apps compare in terms of:

  • Requiring additional source books be purchased in-app
  • Having poor performance or user interface
  • Having bad mobile apps in general
  • Not supporting either iOS or Android
  • Anything else relevant
  • Allowing the DM to view characters sheets

Venus RISC-V how to loop, compare, and print?

I am trying to loop through an array and if the number is larger than X then print.

I’ve tried to find tutorials online but I’m just stuck on why it is not working/outputting anything. My comments kind of explain what i tried to do.

.data arrayOfNums: .word 0 .word 1 .word 122 .word 1112 .word 4294967295 .word 22 .word 234234 .word 23332 .word 42 .word 23423  K: .word 2237  .text .globl main  main: ####   *** vv My problem starts here vv ***   #### la t0 K             #set t0 to K la t1 arrayOfNums   #set t1 pointer to array addi a1 t0 0        #add t0 deallocated to a1 addi a2 t1 0        #add t1 deallocated to a2  loop:      addi a0 x0 1        # print_int ecall     addi a1 t1 0        # add t1 value to print     ecall     addi t1, t1, 4      # Increments t1 to move to the next element     jal x0, loop  exit: ####Exit using environmental calls#### addi a1 x0 0         # random exit 0  addi a0 x0 17        # print_int ecall ecall 

Thank you for your help!!