indexing

问题 For a database hosted on Azure, i can view the recent history of the queries performed on it. This is through the Azure portal > Database > Manage > Administration > Query Performance . Unfortunately, the history found there, only covers a small time frame (few minutes). I intend to create non-clustered indexes on my database and for that, need to get a log of the real queries run on the data on a typical day, as opposed to the past few minutes. Currently, i have to keep refreshing the page

问题 For a database hosted on Azure, i can view the recent history of the queries performed on it. This is through the Azure portal > Database > Manage > Administration > Query Performance . Unfortunately, the history found there, only covers a small time frame (few minutes). I intend to create non-clustered indexes on my database and for that, need to get a log of the real queries run on the data on a typical day, as opposed to the past few minutes. Currently, i have to keep refreshing the page

问题 For a database hosted on Azure, i can view the recent history of the queries performed on it. This is through the Azure portal > Database > Manage > Administration > Query Performance . Unfortunately, the history found there, only covers a small time frame (few minutes). I intend to create non-clustered indexes on my database and for that, need to get a log of the real queries run on the data on a typical day, as opposed to the past few minutes. Currently, i have to keep refreshing the page

问题 I have a massive dataframe, and I'm getting the error: TypeError: ("Empty 'DataFrame': no numeric data to plot", 'occurred at index 159220') I've already dropped nulls, and checked dtypes for the DataFrame so I have no guess as to why it's failing on that row. How do I print out just that row (at index 159220) of the data frame? Thanks 回答1: When you call loc with a scalar value, you get a pd.Series . That series will then have one dtype . If you want to see the row as it is in the dataframe,

问题 First lets create a nested object which is jsonable in python: ExampleObject1 = [ {'a':0, 'b':1} , {'c':2, 'd':3} ] ExampleObject2 = [ {'a':0, 'b':ExampleObject1}, {'c':2, 'd':3} ] ExampleObject3 = [ {'a':0, 'b':ExampleObject1}, {'c':ExampleObject2, 'd':3} ] We can easily access an element with chaining square brackets like so: print ( ExampleObject3[0]['b'][0]['b'] ) >>> 1 How can I access the same element with a list of keys instead of needing the square brackets? print ( ExampleObject3[ (0

问题 I have list of objects with attribute id and I want to find index of object with specific id. I wrote something like this: index = -1 for i in range(len(my_list)): if my_list[i].id == 'specific_id' index = i break but it doesn't look very well. Are there any better options? 回答1: Assuming a = [1,2,3,4] val = 3 Do a.index(val) if val in a else -1 For multiple occurrence, as per Azam's comment below: [i if val == x else -1 for i,x in enumerate(a)] Edit1: For everyone commenting that its List of

问题 New to Python, trying to understand how this iterative loop that is intended to remove all items form the list is handling the indexes in the list and why it stops where it does... Why does this loop: foo = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'] for i in foo: foo.remove(i) print foo Stop here? ['b', 'd', 'f', 'h'] Instead of here? ['H'] Also, what's happening "under the hood" with the indexes here? With every iteration, is Python keeping track of which index is next while at the same time,

问题 I am running an elastic search version 4.1 on windows 8. I tried to index a document through java. When running a JUNIT test the error appears as below. org.elasticsearch.action.UnavailableShardsException: [wms][3] Primary shard is not active or isn't assigned is a known node. Timeout: [1m], request: index {[wms][video][AUpdb-bMQ3rfSDgdctGY], source[{ "fleetNumber": "45", "timestamp": "1245657888", "geoTag": "73.0012312,-123.00909", "videoName": "timestamp.mjpeg", "content": "ASD123124NMMM" }

问题 I am running an elastic search version 4.1 on windows 8. I tried to index a document through java. When running a JUNIT test the error appears as below. org.elasticsearch.action.UnavailableShardsException: [wms][3] Primary shard is not active or isn't assigned is a known node. Timeout: [1m], request: index {[wms][video][AUpdb-bMQ3rfSDgdctGY], source[{ "fleetNumber": "45", "timestamp": "1245657888", "geoTag": "73.0012312,-123.00909", "videoName": "timestamp.mjpeg", "content": "ASD123124NMMM" }

问题 I am running an elastic search version 4.1 on windows 8. I tried to index a document through java. When running a JUNIT test the error appears as below. org.elasticsearch.action.UnavailableShardsException: [wms][3] Primary shard is not active or isn't assigned is a known node. Timeout: [1m], request: index {[wms][video][AUpdb-bMQ3rfSDgdctGY], source[{ "fleetNumber": "45", "timestamp": "1245657888", "geoTag": "73.0012312,-123.00909", "videoName": "timestamp.mjpeg", "content": "ASD123124NMMM" }