indexing Questions
8
I'm using MongoDB and have a collection with roughly 75 million records.
I have added a compound index on two "fields" by using the following command:
db.my_collection.ensureIndex({"data.items.te...
Philan asked 10/3, 2014 at 19:17
1
I'm working with a relatively large Postgres db containing several terabytes of data. It consists of data from 5 years back. As a result all the indexes are growing and therefore reducing the query...
Olio asked 10/4 at 14:8
12
Solved
Only for one file, I am getting the following error:
error: unable to write sha1 filename /opt/www/.git/objects/3f/ce3587c54a8be14c69b08c6b01f94949b11b47: Permission denied
error: wp/wp-admin/css...
3
Solved
I have 3 arrays, for example:
const
A: Array[0..9] of Byte = ($00, $01, $AA, $A1, $BB, $B1, $B2, $B3, $B4, $FF);
B: Array[0..2] of Byte = ($A1, $BB, $B1);
C: Array[0..2] of Byte = ($00, $BB, $F...
24
Solved
So I have an unsorted numeric array int[] anArray = { 1, 5, 2, 7 }; and I need to get both the value and the index of the largest value in the array which would be 7 and 3, how would I do this?
3
Solved
I can view the total size of all indexes in a table with
SELECT pg_size_pretty (pg_indexes_size('table_name'));
and the size of a specific index with:
select pg_size_pretty(pg_relation_size('index_...
Handlebar asked 28/7, 2021 at 12:8
2
Solved
Can I specify a pandas DataFrame index name in the constructor?
Said otherwise, I would like to do the following:
df = pd.DataFrame({"a":[1,2],"b":[3,4]})
df.rename_axis(index='...
4
Solved
I have df:
domain orgid
csyunshu.com 108299
dshu.com 108299
bbbdshu.com 108299
cwakwakmrg.com 121303
ckonkatsunet.com 121303
I would like to add a new column with replaces domain column with num...
8
Solved
Where can I find information on the differences between calling on a column within a data.frame via:
df <- data.frame(x=1:20,y=letters[1:20],z=20:1)
df$x
df["x"]
They both return the "same" ...
2
Solved
The author of Bitmap Scan described the difference between Bitmap Heap Scan and Index Scan:
A plain indexscan fetches one tuple-pointer at a time from the index,
and immediately visits that tup...
Shanty asked 12/4, 2019 at 11:54
3
I have created the original dataframe from a CSV file
df = pd.read_csv(r'C:\Users\Sam\cars.csv')
Which produces a df with the following columns
Index(['mpg', 'cylinders', 'displacement', 'horsepow...
41
Solved
A project I've been working for 2 months stopped working for no reason because Xcode got stucked on "Indexing". I can't Build the project anymore. If I try to build, Xcode freezes and I have to for...
18
I have a numerical list:
myList = [1, 2, 3, 100, 5]
Now if I sort this list to obtain [1, 2, 3, 5, 100].
What I want is the indices of the elements from the
original list in the sorted order i...
17
Solved
I have this DataFrame and want only the records whose EPS column is not NaN:
STK_ID EPS cash
STK_ID RPT_Date
601166 20111231 601166 NaN NaN
600036 20111231 600036 NaN 12
600016 20111231 600016 4....
5
Solved
I want to add an index to a table by using the ALTER syntax, but first check if it already exists on the table, and only add the index if it does not exist.
ALTER TABLE tableName ADD INDEX IX_Ta...
8
Solved
The list.index(x) function returns the index in the list of the first item whose value is x.
Is there a function, list_func_index(), similar to the index() function that has a function, f(), as a ...
10
When should I use a composite index in a database?
What are the performance ramification by using a
composite index)?
Why should I use use a composite index?
For example, I have a homes table:
...
Harvestman asked 1/12, 2009 at 2:47
9
Solved
In software engineering we create indexes all the time (e.g., in databases) but I also hear a lot of people talk about inverted indices. Is there something fundamentally different between the two? ...
Principle asked 11/10, 2011 at 14:30
5
Solved
I have a character vector of a certain length (that should not be changed) like this:
my.vec <- rep("free", 40000)
What I need to do now is the following:
I need to loop 22 through ...
Susuable asked 23/2 at 10:39
4
Solved
I know how to get a cell's row and column index with jQuery, but I can't figure out the reverse. Given a row and column index, how would I access the td at this location?
Nasty asked 26/5, 2011 at 13:38
2
Solved
I'm doing the following in order to import some txt tables and keep them as list:
# set working directory - the folder where all selection tables are stored
hypo_selections<-list.files() # chang...
Petigny asked 13/1, 2014 at 12:21
3
Solved
This code
CurrentSelectedRow = Me.dgvPreviouslyCut.CurrentRow.Index
stores the current selected row that has been clicked by the user in a data grid view control .
After refreshing the datasourc...
Fayfayal asked 10/3, 2014 at 15:44
18
Solved
Is it normal for Intelli J to take a lot of time (almost 12 hours) to update indices for a project? I just installed Intelli J on my machine and imported a rather large Maven project (13k+ files). ...
Diacritic asked 13/4, 2013 at 18:48
6
Solved
I've developed an app for Mac OS X Lion using its new view-based NSTableView, but as I want to port the whole app to Snow Leopard I'm trying to figure out the best way to emulate such a tableview. ...
Basicity asked 22/10, 2011 at 15:10
8
Solved
I want to generate a script of all the indexes in a database(Create Index).
I don't want the index script along with create table script. how can we generate it in SQL Server (2005 or 2008). There...
Wallop asked 1/2, 2012 at 1:51
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