MongoDB slow with index and sort
I have compound index:
{
"hidden" : 1,
"country" : 1,
"edited" : 1,
"changeset.when" : -1
}
And query:
{
"country" : "ua",
"edited" : true,
"hidden" : false,
"changeset.when" : { "$lt" : ISODate("5138-11-16T09:46:40Z") }
}
It works well and fast. Now I want to sort result by: { "changeset.when" : -1 } and it slows down a lot. From hundred of milliseconds to 15 seconds.
And here is explain for query with sorting:
"winningPlan" : {
"stage" : "SORT",
"sortPattern" : {
"changeset.when" : -1
},
"limitAmount" : 15,
"inputStage" : {
"stage" : "SORT_KEY_GENERATOR",
"inputStage" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"hidden" : 1,
"country" : 1,
"edited" : 1,
"changeset.when" : -1
},
"indexName" : "edited_news",
"isMultiKey" : true,
"multiKeyPaths" : {
"hidden" : [ ],
"country" : [ ],
"edited" : [ ],
"changeset.when" : [
"changeset"
]
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 2,
"direction" : "forward",
"indexBounds" : {
"hidden" : [
"[false, false]"
],
"country" : [
"["ua", "ua"]"
],
"edited" : [
"[true, true]"
],
"changeset.when" : [
"(new Date(100000000000000), true)"
]
}
}
}
}
}
Why is it so slow? Explain shows that it successfully uses needed index and field changeset.when is in descending order.
mongodb indexing
asked Nov 13 '18 at 15:54
OckonalOckonal
19.8k65163279
add a comment |
I have compound index:
{
"hidden" : 1,
"country" : 1,
"edited" : 1,
"changeset.when" : -1
}
And query:
{
"country" : "ua",
"edited" : true,
"hidden" : false,
"changeset.when" : { "$lt" : ISODate("5138-11-16T09:46:40Z") }
}
It works well and fast. Now I want to sort result by: { "changeset.when" : -1 } and it slows down a lot. From hundred of milliseconds to 15 seconds.
And here is explain for query with sorting:
"winningPlan" : {
"stage" : "SORT",
"sortPattern" : {
"changeset.when" : -1
},
"limitAmount" : 15,
"inputStage" : {
"stage" : "SORT_KEY_GENERATOR",
"inputStage" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"hidden" : 1,
"country" : 1,
"edited" : 1,
"changeset.when" : -1
},
"indexName" : "edited_news",
"isMultiKey" : true,
"multiKeyPaths" : {
"hidden" : [ ],
"country" : [ ],
"edited" : [ ],
"changeset.when" : [
"changeset"
]
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 2,
"direction" : "forward",
"indexBounds" : {
"hidden" : [
"[false, false]"
],
"country" : [
"["ua", "ua"]"
],
"edited" : [
"[true, true]"
],
"changeset.when" : [
"(new Date(100000000000000), true)"
]
}
}
}
}
}
Why is it so slow? Explain shows that it successfully uses needed index and field changeset.when is in descending order.
mongodb indexing
asked Nov 13 '18 at 15:54
OckonalOckonal
19.8k65163279
Try puttingchangeset.whenas the first entry in the index or creating a single key index on that field.. See docs.mongodb.com/manual/tutorial/sort-results-with-indexes
– Paul
Nov 13 '18 at 16:01
add a comment |
I have compound index:
{
"hidden" : 1,
"country" : 1,
"edited" : 1,
"changeset.when" : -1
}
And query:
{
"country" : "ua",
"edited" : true,
"hidden" : false,
"changeset.when" : { "$lt" : ISODate("5138-11-16T09:46:40Z") }
}
It works well and fast. Now I want to sort result by: { "changeset.when" : -1 } and it slows down a lot. From hundred of milliseconds to 15 seconds.
And here is explain for query with sorting:
"winningPlan" : {
"stage" : "SORT",
"sortPattern" : {
"changeset.when" : -1
},
"limitAmount" : 15,
"inputStage" : {
"stage" : "SORT_KEY_GENERATOR",
"inputStage" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"hidden" : 1,
"country" : 1,
"edited" : 1,
"changeset.when" : -1
},
"indexName" : "edited_news",
"isMultiKey" : true,
"multiKeyPaths" : {
"hidden" : [ ],
"country" : [ ],
"edited" : [ ],
"changeset.when" : [
"changeset"
]
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 2,
"direction" : "forward",
"indexBounds" : {
"hidden" : [
"[false, false]"
],
"country" : [
"["ua", "ua"]"
],
"edited" : [
"[true, true]"
],
"changeset.when" : [
"(new Date(100000000000000), true)"
]
}
}
}
}
}
Why is it so slow? Explain shows that it successfully uses needed index and field changeset.when is in descending order.
mongodb indexing
asked Nov 13 '18 at 15:54
OckonalOckonal
19.8k65163279
I have compound index:
{
"hidden" : 1,
"country" : 1,
"edited" : 1,
"changeset.when" : -1
}
And query:
{
"country" : "ua",
"edited" : true,
"hidden" : false,
"changeset.when" : { "$lt" : ISODate("5138-11-16T09:46:40Z") }
}
It works well and fast. Now I want to sort result by: { "changeset.when" : -1 } and it slows down a lot. From hundred of milliseconds to 15 seconds.
And here is explain for query with sorting:
"winningPlan" : {
"stage" : "SORT",
"sortPattern" : {
"changeset.when" : -1
},
"limitAmount" : 15,
"inputStage" : {
"stage" : "SORT_KEY_GENERATOR",
"inputStage" : {
"stage" : "FETCH",
"inputStage" : {
"stage" : "IXSCAN",
"keyPattern" : {
"hidden" : 1,
"country" : 1,
"edited" : 1,
"changeset.when" : -1
},
"indexName" : "edited_news",
"isMultiKey" : true,
"multiKeyPaths" : {
"hidden" : [ ],
"country" : [ ],
"edited" : [ ],
"changeset.when" : [
"changeset"
]
},
"isUnique" : false,
"isSparse" : false,
"isPartial" : false,
"indexVersion" : 2,
"direction" : "forward",
"indexBounds" : {
"hidden" : [
"[false, false]"
],
"country" : [
"["ua", "ua"]"
],
"edited" : [
"[true, true]"
],
"changeset.when" : [
"(new Date(100000000000000), true)"
]
}
}
}
}
}
Why is it so slow? Explain shows that it successfully uses needed index and field changeset.when is in descending order.
mongodb indexing
mongodb indexing
asked Nov 13 '18 at 15:54
OckonalOckonal
19.8k65163279
asked Nov 13 '18 at 15:54
OckonalOckonal
19.8k65163279
asked Nov 13 '18 at 15:54
OckonalOckonal
19.8k65163279
asked Nov 13 '18 at 15:54
OckonalOckonal
19.8k65163279
asked Nov 13 '18 at 15:54
OckonalOckonal
19.8k65163279
19.8k65163279
Try puttingchangeset.whenas the first entry in the index or creating a single key index on that field.. See docs.mongodb.com/manual/tutorial/sort-results-with-indexes
– Paul
Nov 13 '18 at 16:01
add a comment |
Try puttingchangeset.whenas the first entry in the index or creating a single key index on that field.. See docs.mongodb.com/manual/tutorial/sort-results-with-indexes
– Paul
Nov 13 '18 at 16:01
Try putting
changeset.when as the first entry in the index or creating a single key index on that field.. See docs.mongodb.com/manual/tutorial/sort-results-with-indexes– Paul
Nov 13 '18 at 16:01
Try putting
changeset.when as the first entry in the index or creating a single key index on that field.. See docs.mongodb.com/manual/tutorial/sort-results-with-indexes– Paul
Nov 13 '18 at 16:01
add a comment |
1 Answer
1
active
oldest
votes
In case if you have compound index try to create query key sequence like your index sequencency. It will bring more performance.
You don't need to make aditional sort for result, by default result will be sorted according index (in your case result will be sorted descending by changeset.when)
For more info please share some documents from your collection.
If you have any question feel free to ask
answered Nov 14 '18 at 8:20
andranikaslandranikasl
38924
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
In case if you have compound index try to create query key sequence like your index sequencency. It will bring more performance.
You don't need to make aditional sort for result, by default result will be sorted according index (in your case result will be sorted descending by changeset.when)
For more info please share some documents from your collection.
If you have any question feel free to ask
answered Nov 14 '18 at 8:20
andranikaslandranikasl
38924
add a comment |
In case if you have compound index try to create query key sequence like your index sequencency. It will bring more performance.
You don't need to make aditional sort for result, by default result will be sorted according index (in your case result will be sorted descending by changeset.when)
For more info please share some documents from your collection.
If you have any question feel free to ask
answered Nov 14 '18 at 8:20
andranikaslandranikasl
38924
add a comment |
In case if you have compound index try to create query key sequence like your index sequencency. It will bring more performance.
You don't need to make aditional sort for result, by default result will be sorted according index (in your case result will be sorted descending by changeset.when)
For more info please share some documents from your collection.
If you have any question feel free to ask
answered Nov 14 '18 at 8:20
andranikaslandranikasl
38924
In case if you have compound index try to create query key sequence like your index sequencency. It will bring more performance.
You don't need to make aditional sort for result, by default result will be sorted according index (in your case result will be sorted descending by changeset.when)
For more info please share some documents from your collection.
If you have any question feel free to ask
answered Nov 14 '18 at 8:20
andranikaslandranikasl
38924
answered Nov 14 '18 at 8:20
andranikaslandranikasl
38924
answered Nov 14 '18 at 8:20
andranikaslandranikasl
38924
answered Nov 14 '18 at 8:20
andranikaslandranikasl
38924
38924
add a comment |
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Try putting
changeset.whenas the first entry in the index or creating a single key index on that field.. See docs.mongodb.com/manual/tutorial/sort-results-with-indexes– Paul
Nov 13 '18 at 16:01