我的数据在 Dynamo DB 中的最大分区键长度
Maximum Partition key length of my data in Dynamo DB
我有一个用例来限制我的应用程序中的密钥大小。到目前为止，我试图在我的 DynamoDB table 中找到分区键的最大长度。这将帮助我在对我用作 Dynamo DB 中的分区键的数据施加任何内部约束之前了解我的数据。
示例：假设这是我的 table 和分区键 (idempotent_id)。我想知道到目前为止分区键的最大长度（在本例中为 7）。
idempotent_id
1234
12
1234567
12345
我尝试从我的 aws 帐户使用 Dynamo DB 控制台。我查看了 DynamoDB 的 query and scan api。但似乎没有什么适合我的。可能这是我们使用 DynamoDB 找不到的东西？或者可能是我搜索错误？
任何帮助将不胜感激。
查看数据类型部分及其限制：http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html
String
The length of a String is constrained by the maximum item size of 400
KB.
Strings are Unicode with UTF-8 binary encoding. Because UTF-8 is a
variable width encoding, DynamoDB determines the length of a String
using its UTF-8 bytes.
Number
A Number can have up to 38 digits of precision, and can be positive,
negative, or zero.
Positive range: 1E-130 to 9.9999999999999999999999999999999999999E+125
Negative range: -9.9999999999999999999999999999999999999E+125 to
-1E-130 DynamoDB uses JSON strings to represent Number data in requests and replies. For more information, see DynamoDB Low-Level
API.
If number precision is important, you should pass numbers to DynamoDB
using strings that you convert from a number type.
Binary
The length of a Binary is constrained by the maximum item size of 400
KB.
Applications that work with Binary attributes must encode the data in
Base64 format before sending it to DynamoDB. Upon receipt of the data,
DynamoDB decodes it into an unsigned byte array and uses that as the
length of the attribute.
来自你的：
I am trying to find the maximum size/length of idempotent_id so far in my single table.
为了在没有任何辅助数据的情况下执行此操作，您需要执行 full table scan and get the result attributes you care for from each item. You can use a ProjectionExpressions 以减少检索的数据量。
您可以将该值存储在另一个属性中，并在该属性上创建一个 GSI，这样您就可以按顺序查询该索引。
另一种选择是使用 DynamoDB Streams 之类的东西来监听事件并跟踪不同存储介质中的最大大小。
分区键和排序键
分区键长度
分区键值的最小长度为 1 个字节。最大长度为 2048 字节。
分区键值
tables 或二级索引的不同分区键值的数量没有实际限制。
排序关键字长度
排序键值的最小长度为 1 个字节。最大长度为 1024 字节。
对键值进行排序
通常，每个分区键值的不同排序键值的数量没有实际限制。
具有二级索引的 table 例外。对于本地二级索引，项目集合大小有限制：对于每个不同的分区键值，所有 table 和索引项目的总大小不能超过 10 GB。这可能会限制每个分区键值的排序键数。有关详细信息，请参阅项目集合大小限制。
Range Key Example
string = '1USER:01G23WSPRVXA8BWK5ERD0TDYT501G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sl'
string.length => 1024
您还可以检查字符串字节 HERE
有趣的是，如果我向该字符串再添加一个字符，然后使用该字符串作为范围键创建一个新项目，我会收到以下错误。
UnhandledPromiseRejectionWarning: ValidationException: Hash primary key values must be under 2048 bytes, and range primary key values must be under 1024 bytes
实测是range key length can be <= 1024 where the error messages said only that of < 1024. 对于2048的Primary Hash Key也是一样的区别；警告说 < 2048 但数据库除外 <= 2048.
注意：两个键必须至少是一个字符。以下是Range键为空字符串时的错误信息。
UnhandledPromiseRejectionWarning: ValidationException: One or more parameter values are not valid. The AttributeValue for a key attribute cannot contain an empty string value. Key: SK
Primary (Hash) Key Example
string = '01G23XW4MCMTGMRWD4R78NMA29:USERS31:1USER:01G23WSPRVXA8BWK5ERD0TDYT501G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;slskahlsfdjlashghjskhglhaskjghlhsdghjkahskghlahkdhgkjashdjkghjakshghasjkdhg;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;slskahlsfdjlashghjskhglhaskjghlhsdghjkahskghlahkdhgkjashdjkghjakshghasjkdhg;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;slskahlsfdjlashghjskhglhaskjghlhsdghjkahskghlahkdhgkjashdjkghjakshghasjkdhg;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;slskahlsfdjlashghjskhglhaskjghlhsdghjkahsdsagsdgdggg'
string.length => 2048
我有一个用例来限制我的应用程序中的密钥大小。到目前为止，我试图在我的 DynamoDB table 中找到分区键的最大长度。这将帮助我在对我用作 Dynamo DB 中的分区键的数据施加任何内部约束之前了解我的数据。
示例：假设这是我的 table 和分区键 (idempotent_id)。我想知道到目前为止分区键的最大长度（在本例中为 7）。
idempotent_id
1234
12
1234567
12345
我尝试从我的 aws 帐户使用 Dynamo DB 控制台。我查看了 DynamoDB 的 query and scan api。但似乎没有什么适合我的。可能这是我们使用 DynamoDB 找不到的东西？或者可能是我搜索错误？ 任何帮助将不胜感激。
查看数据类型部分及其限制：http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html
String
The length of a String is constrained by the maximum item size of 400 KB.
Strings are Unicode with UTF-8 binary encoding. Because UTF-8 is a variable width encoding, DynamoDB determines the length of a String using its UTF-8 bytes.
Number
A Number can have up to 38 digits of precision, and can be positive, negative, or zero.
Positive range: 1E-130 to 9.9999999999999999999999999999999999999E+125 Negative range: -9.9999999999999999999999999999999999999E+125 to -1E-130 DynamoDB uses JSON strings to represent Number data in requests and replies. For more information, see DynamoDB Low-Level API.
If number precision is important, you should pass numbers to DynamoDB using strings that you convert from a number type.
Binary
The length of a Binary is constrained by the maximum item size of 400 KB.
Applications that work with Binary attributes must encode the data in Base64 format before sending it to DynamoDB. Upon receipt of the data, DynamoDB decodes it into an unsigned byte array and uses that as the length of the attribute.
来自你的
I am trying to find the maximum size/length of idempotent_id so far in my single table.
为了在没有任何辅助数据的情况下执行此操作，您需要执行 full table scan and get the result attributes you care for from each item. You can use a ProjectionExpressions 以减少检索的数据量。
您可以将该值存储在另一个属性中，并在该属性上创建一个 GSI，这样您就可以按顺序查询该索引。
另一种选择是使用 DynamoDB Streams 之类的东西来监听事件并跟踪不同存储介质中的最大大小。
分区键和排序键 分区键长度 分区键值的最小长度为 1 个字节。最大长度为 2048 字节。
分区键值 tables 或二级索引的不同分区键值的数量没有实际限制。
排序关键字长度 排序键值的最小长度为 1 个字节。最大长度为 1024 字节。
对键值进行排序 通常，每个分区键值的不同排序键值的数量没有实际限制。
具有二级索引的 table 例外。对于本地二级索引，项目集合大小有限制：对于每个不同的分区键值，所有 table 和索引项目的总大小不能超过 10 GB。这可能会限制每个分区键值的排序键数。有关详细信息，请参阅项目集合大小限制。
Range Key Example
string = '1USER:01G23WSPRVXA8BWK5ERD0TDYT501G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sl'
string.length => 1024
您还可以检查字符串字节 HERE
有趣的是，如果我向该字符串再添加一个字符，然后使用该字符串作为范围键创建一个新项目，我会收到以下错误。
UnhandledPromiseRejectionWarning: ValidationException: Hash primary key values must be under 2048 bytes, and range primary key values must be under 1024 bytes
实测是range key length can be <= 1024 where the error messages said only that of < 1024. 对于2048的Primary Hash Key也是一样的区别；警告说 < 2048 但数据库除外 <= 2048.
注意：两个键必须至少是一个字符。以下是Range键为空字符串时的错误信息。
UnhandledPromiseRejectionWarning: ValidationException: One or more parameter values are not valid. The AttributeValue for a key attribute cannot contain an empty string value. Key: SK
Primary (Hash) Key Example
string = '01G23XW4MCMTGMRWD4R78NMA29:USERS31:1USER:01G23WSPRVXA8BWK5ERD0TDYT501G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;sljs;gjasjfdaskfjas;dfjaskdfjaskldfjkasjfjkasjfjlsjdfjskjfjlsajf;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;slskahlsfdjlashghjskhglhaskjghlhsdghjkahskghlahkdhgkjashdjkghjakshghasjkdhg;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;slskahlsfdjlashghjskhglhaskjghlhsdghjkahskghlahkdhgkjashdjkghjakshghasjkdhg;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;slskahlsfdjlashghjskhglhaskjghlhsdghjkahskghlahkdhgkjashdjkghjakshghasjkdhg;jslfjklsajjj;sdfjsfjas;fjsa;fjs;ldfkjsadk;lsfasjjf;jfj;jdksfjsljfksfksf;afjs;lfjsljflsjkssdjfsjfsljskdkdkdkdkdkdkddkdkksajglks;jgsag;ljd;lagjdkllgkjsklgj01G0G9WD6E1JXPZTFBJAAFKJ9N:CLIENTONE:NAVBAR:V1:lsj;lajgjsldglsjgjasgjsjdgjsdjgjajjg;slskahlsfdjlashghjskhglhaskjghlhsdghjkahsdsagsdgdggg'
string.length => 2048