MongoDB Error in inserting documents, how do I resolve it?











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I have been trying to import a JSON file into mongoDB via command prompt, but I get an output that says error inserting documents.



C:UserscheryDocumentsNUS Y2 Sem 1 ModulesBT2102Tutorials>mongoimport --db school --collection students students.json

2018-11-07T15:37:30.974+0800    connected to: localhost

2018-11-07T15:37:31.210+0800    num failures: 50

2018-11-07T15:37:31.211+0800    error inserting documents: multiple errors in bulk operation:

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 2 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 3 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 4 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 5 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 1 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 0 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 6 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 7 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 10 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 8 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 12 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 13 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 11 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 14 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 15 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 16 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 17 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 18 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 9 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 19 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 20 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 23 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 24 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 22 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 26 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 25 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 27 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 29 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 28 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 21 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 30 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 31 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 33 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 35 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 34 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 36 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 37 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 38 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 32 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 40 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 39 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 41 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 43 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 44 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 46 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 47 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 42 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 45 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 48 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 49 }



2018-11-07T15:37:31.211+0800    imported 0 documents


May I know what is the issue here and how do I rectify the error?



I would really appreciate any help out there!






mongodb







share|improve this question






















  • You are trying to insert documents with an _id that already exists. Depending on your application you may want to update that existing document instead, or maybe set a different _id. It is also possible that you are setting _id to something you did not really intend to -- it looks weird in the error message. Double-check how the document looks.
    – Thilo
    Nov 7 at 7:46












  • As a general rule of thumb, and adding on top of what @Thilo already mentions in the comment above, you should avoid using custom values in the "_id" field and let MongoDB generate ObjectIds for you. In other words, do not set _id to anything in your documents if at all possible, that will improve performance and guarantee uniqueness (for that particular key).
    – Gorka Hernandez
    Nov 7 at 8:38






  • 1




    You can try and import into a different collection and work with that collection if this is just a tutorial or drop the existing collection first and then import again if the existing data is not needed
    – Ryan Dobbs
    Nov 7 at 13:53















up vote
0
down vote

favorite












I have been trying to import a JSON file into mongoDB via command prompt, but I get an output that says error inserting documents.



C:UserscheryDocumentsNUS Y2 Sem 1 ModulesBT2102Tutorials>mongoimport --db school --collection students students.json

2018-11-07T15:37:30.974+0800    connected to: localhost

2018-11-07T15:37:31.210+0800    num failures: 50

2018-11-07T15:37:31.211+0800    error inserting documents: multiple errors in bulk operation:

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 2 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 3 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 4 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 5 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 1 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 0 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 6 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 7 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 10 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 8 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 12 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 13 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 11 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 14 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 15 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 16 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 17 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 18 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 9 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 19 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 20 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 23 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 24 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 22 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 26 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 25 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 27 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 29 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 28 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 21 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 30 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 31 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 33 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 35 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 34 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 36 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 37 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 38 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 32 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 40 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 39 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 41 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 43 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 44 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 46 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 47 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 42 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 45 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 48 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 49 }



2018-11-07T15:37:31.211+0800    imported 0 documents


May I know what is the issue here and how do I rectify the error?



I would really appreciate any help out there!






mongodb







share|improve this question






















  • You are trying to insert documents with an _id that already exists. Depending on your application you may want to update that existing document instead, or maybe set a different _id. It is also possible that you are setting _id to something you did not really intend to -- it looks weird in the error message. Double-check how the document looks.
    – Thilo
    Nov 7 at 7:46












  • As a general rule of thumb, and adding on top of what @Thilo already mentions in the comment above, you should avoid using custom values in the "_id" field and let MongoDB generate ObjectIds for you. In other words, do not set _id to anything in your documents if at all possible, that will improve performance and guarantee uniqueness (for that particular key).
    – Gorka Hernandez
    Nov 7 at 8:38






  • 1




    You can try and import into a different collection and work with that collection if this is just a tutorial or drop the existing collection first and then import again if the existing data is not needed
    – Ryan Dobbs
    Nov 7 at 13:53













up vote
0
down vote

favorite









up vote
0
down vote

favorite











I have been trying to import a JSON file into mongoDB via command prompt, but I get an output that says error inserting documents.



C:UserscheryDocumentsNUS Y2 Sem 1 ModulesBT2102Tutorials>mongoimport --db school --collection students students.json

2018-11-07T15:37:30.974+0800    connected to: localhost

2018-11-07T15:37:31.210+0800    num failures: 50

2018-11-07T15:37:31.211+0800    error inserting documents: multiple errors in bulk operation:

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 2 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 3 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 4 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 5 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 1 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 0 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 6 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 7 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 10 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 8 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 12 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 13 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 11 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 14 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 15 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 16 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 17 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 18 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 9 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 19 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 20 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 23 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 24 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 22 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 26 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 25 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 27 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 29 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 28 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 21 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 30 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 31 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 33 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 35 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 34 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 36 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 37 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 38 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 32 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 40 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 39 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 41 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 43 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 44 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 46 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 47 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 42 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 45 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 48 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 49 }



2018-11-07T15:37:31.211+0800    imported 0 documents


May I know what is the issue here and how do I rectify the error?



I would really appreciate any help out there!






mongodb







share|improve this question













I have been trying to import a JSON file into mongoDB via command prompt, but I get an output that says error inserting documents.



C:UserscheryDocumentsNUS Y2 Sem 1 ModulesBT2102Tutorials>mongoimport --db school --collection students students.json

2018-11-07T15:37:30.974+0800    connected to: localhost

2018-11-07T15:37:31.210+0800    num failures: 50

2018-11-07T15:37:31.211+0800    error inserting documents: multiple errors in bulk operation:

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 2 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 3 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 4 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 5 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 1 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 0 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 6 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 7 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 10 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 8 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 12 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 13 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 11 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 14 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 15 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 16 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 17 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 18 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 9 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 19 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 20 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 23 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 24 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 22 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 26 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 25 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 27 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 29 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 28 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 21 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 30 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 31 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 33 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 35 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 34 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 36 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 37 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 38 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 32 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 40 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 39 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 41 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 43 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 44 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 46 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 47 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 42 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 45 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 48 }

  - E11000 duplicate key error collection: school.students index: _id_ dup key: { : 49 }



2018-11-07T15:37:31.211+0800    imported 0 documents


May I know what is the issue here and how do I rectify the error?



I would really appreciate any help out there!






mongodb




mongodb






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 7 at 7:44









Cheryl

65




65












  • You are trying to insert documents with an _id that already exists. Depending on your application you may want to update that existing document instead, or maybe set a different _id. It is also possible that you are setting _id to something you did not really intend to -- it looks weird in the error message. Double-check how the document looks.
    – Thilo
    Nov 7 at 7:46












  • As a general rule of thumb, and adding on top of what @Thilo already mentions in the comment above, you should avoid using custom values in the "_id" field and let MongoDB generate ObjectIds for you. In other words, do not set _id to anything in your documents if at all possible, that will improve performance and guarantee uniqueness (for that particular key).
    – Gorka Hernandez
    Nov 7 at 8:38






  • 1




    You can try and import into a different collection and work with that collection if this is just a tutorial or drop the existing collection first and then import again if the existing data is not needed
    – Ryan Dobbs
    Nov 7 at 13:53


















  • You are trying to insert documents with an _id that already exists. Depending on your application you may want to update that existing document instead, or maybe set a different _id. It is also possible that you are setting _id to something you did not really intend to -- it looks weird in the error message. Double-check how the document looks.
    – Thilo
    Nov 7 at 7:46












  • As a general rule of thumb, and adding on top of what @Thilo already mentions in the comment above, you should avoid using custom values in the "_id" field and let MongoDB generate ObjectIds for you. In other words, do not set _id to anything in your documents if at all possible, that will improve performance and guarantee uniqueness (for that particular key).
    – Gorka Hernandez
    Nov 7 at 8:38






  • 1




    You can try and import into a different collection and work with that collection if this is just a tutorial or drop the existing collection first and then import again if the existing data is not needed
    – Ryan Dobbs
    Nov 7 at 13:53
















You are trying to insert documents with an _id that already exists. Depending on your application you may want to update that existing document instead, or maybe set a different _id. It is also possible that you are setting _id to something you did not really intend to -- it looks weird in the error message. Double-check how the document looks.
– Thilo
Nov 7 at 7:46






You are trying to insert documents with an _id that already exists. Depending on your application you may want to update that existing document instead, or maybe set a different _id. It is also possible that you are setting _id to something you did not really intend to -- it looks weird in the error message. Double-check how the document looks.
– Thilo
Nov 7 at 7:46














As a general rule of thumb, and adding on top of what @Thilo already mentions in the comment above, you should avoid using custom values in the "_id" field and let MongoDB generate ObjectIds for you. In other words, do not set _id to anything in your documents if at all possible, that will improve performance and guarantee uniqueness (for that particular key).
– Gorka Hernandez
Nov 7 at 8:38




As a general rule of thumb, and adding on top of what @Thilo already mentions in the comment above, you should avoid using custom values in the "_id" field and let MongoDB generate ObjectIds for you. In other words, do not set _id to anything in your documents if at all possible, that will improve performance and guarantee uniqueness (for that particular key).
– Gorka Hernandez
Nov 7 at 8:38




1




1




You can try and import into a different collection and work with that collection if this is just a tutorial or drop the existing collection first and then import again if the existing data is not needed
– Ryan Dobbs
Nov 7 at 13:53




You can try and import into a different collection and work with that collection if this is just a tutorial or drop the existing collection first and then import again if the existing data is not needed
– Ryan Dobbs
Nov 7 at 13:53

















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Hercules Kyvelos

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Main article: Taifa of Zaragoza Al-Mu'taman Ruler of Zaragoza Reign 1081–1085 Predecessor Ahmad al-Muqtadir Successor Al-Mustain II Born Zaragoza Died 1085 Full name Yusuf ibn Ahmad al-Mu'taman ibn Hūd House Banu Hud Yusuf ibn Ahmad al-Mu'taman ibn Hūd (Arabic: المؤتمن بالله يوسف إبن أحمد إبن هود ‎, al-Mutaman bi l-Lah , died c. 1085) was the third king of the Banu Hud dynasty who ruled over the Taifa of Zaragoza from 1081 to 1085. Yusuf al-Mutaman reigned during the height of power of Muslim Zaragoza , following the thriving period of his father Ahmad al-Muqtadir. He continued his father's efforts and created around him a court of intellectuals, living in the beautiful palace of Aljafería, nicknamed as "the palace of joy". Al-Mu'taman was also a scholarly king and a patron of science, philosophy and arts. As an example of a wise king, he knew astrology, philosophy, and especially mathematics, a discipline in which
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