dynamodb query with multiple conditions

When creating a new user, we want to ensure they havent exceeded their limit. "PutRequest": { } A DynamoDB table consists of items. Let's see a few examples with filter expression in DynamoDB. You can optionally provide a second condition for the sort key (if present). For more information, seeExpression attribute names in DynamoDB and Expression attribute You can check for the existence (or nonexistence) of any attribute. { "Item": { { The number is Condition Expressions can be used in the following write-based API operations: Careful observers might notice theres one write-based operation missing BatchWriteItem. { Did Richard Feynman say that anyone who claims to understand quantum physics is lying or crazy? "OrderId": {"S": "20170609-8718"}, The following are 30 code examples of boto3.dynamodb.conditions.Key(). You can also create your own replicator by using AWS Lambda, and writing one Lambda function to process writes from the tables stream and write them to a new table. { For example, if you obtain 100KB of data in step 1 and filter it down to 10KB in step 2, you'll use the read capacity units for 100KB of data instead of the 10KB that was filtered down. "Amount": {"N": "142.02"} Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. } is ascending. The syntax for a filter expression is similar to that of a key condition expression. applications should not use these legacy parameters, but should use expression parameters "OrderId": {"S": "20160630-4350"}, The element you put in the first blank should be your RANGE key, while the element you put in the second blank should be your HASH key. Instead, we decided to introduce a new GSI that fit our use case better. "Username": {"S": "alexdebrie"}, Notice that the primary key is the combination of the attributes tconst (partition key) and primaryTitle (sort key). This means you cannot immediately attempt a read after writing an item. DynamoDB calculates the number of read capacity units consumed based on item size, not on However, I prefer to remove the extraneous statement for clarity. The main difference is that you'll need to define two attributes rather than one. "AttributeName": "OrderId", Suppose that you wanted to delete the item, but only under the following conditions: The ProductCategory is either "Sporting Goods" or "Gardening Create the client for the DynamoDB document client. } Imagine that organizations sign up for our SaaS product, and they are limited in the number of users based on the plan they chose. condition expression. Why are there two different pronunciations for the word Tee? If your database needs to validate against an increasing number of records as your data grows, your conditional writes are going to get slower and slower. Javascript is disabled or is unavailable in your browser. Supplies.". Once you enabled the stream, you can copy its ARN which we will use in the next step. You then have to specify which attribute is your HASH key and which is your RANGE key. compares binary values. "Item": { When a user initiates a transaction, you want to confirm that the account doesnt drop below $0 before approving. }, b, a <= b For a query on a table, you can have conditions only on the table primary key attributes. This approach is available as a package and is documented in the DynamoDB Developer Guide. . For API details, see To ensure that the item exists before manipulating it, your Condition Expression would be attribute_exists(pk). Each item consists of one partition key and one or more attributes. name and value as an EQ condition. Lets take a look at the process for evaluating Condition Expressions in DynamoDB. Please let us know by emailing blogs@bmc.com. Then the movie primaryTitle is the sort key. There are three steps in this scenario: It is important to set the read limits in step 1 before applying a filter expression. Thanks for letting us know this page needs work. c. The following function is also supported: begins_with (a, values. This is prerelease documentation for a feature in preview release. The issue with this method is that the partition key for the GSI is a new attribute and is empty for all items in the table. "Username": {"S": "alexdebrie"}, But you cant create a partition key for an index that spans multiple attributes. "Username": {"S": "alexdebrie"}, Finally, proceed with the write operation if the Conditin Expression evaluates to true. If you want to know more about how to specify different attribute types in an expression, see Specifying item attributes when using ProjectionExpression is applied to the results. If you're looking for similar guide but for Node.js, you can find it here, for Rust, and for Python / boto3 here. "Username": {"S": "yosemitesam"}, returnedin other words, only those threads with more than a certain number of }, {"N":"6"} does not compare to {"NS":["6", "2", does not have a Price attribute. contains the following elements: ScannedCount The number of items that matched the key It listens for writes and updates in the original table and performs the write and update if the items exist in the new table. Javascript is disabled or is unavailable in your browser. This is in line with any aggregates with DynamoDB you need to maintain the aggregate yourself. Queries a table by using the DynamoDbClient and a secondary index. If youre having trouble grokking this, a walkthrough example may be helpful. The following code examples show how to query a DynamoDB table using an AWS attribute. requirements, you must define an expression attribute name as a placeholder. } If you require strongly consistent reads, set the ConsistentRead only if the item in question does not already have the same key. In doing so, you might have some data in your table as follows: You can see that the user alexdebrie has reviewed Goldilocks, To Kill a Mockingbird, and Dune. } The key condition selects the partition key and, optionally, a sort key. examples are based on the ProductCatalog table, which was introduced in Specifying item attributes when using Although filtering is done on the server side before results are sent back, the read costs are calculated on the Query operation before the filter is applied. A single Query operation can retrieve a maximum of 1 MB of The base table's provisioned read capacity. The core problem here is that weve added a non-deterministic element (timestamp) into our primary key. If an attribute name does not meet these "Item": { "PutRequest": { information, see Key condition expressions for query and Syntax for filter and condition So instead, you can use a filter with scan or query operation for the filtering process by using an access pattern. "1"]}. If data. { The HASH key is particularly important -- you can only grab data for a single HASH key in a Query operation. Please refer to your browser's Help pages for instructions. You must create a retrofitting script to generate the data for this new attribute on existing items so that they are included in the index. "ReadCapacityUnits": 1, In the condition expression, the : (colon character) indicates an less than or equal to the second value. If you are using the query operation, you have to use filter expression with attribute name (#name) and an expression attribute value (:name) like below: Here, we have used the operator symbol <> to get all projects data that is not equal to the project name called Project X. "OrderId": {"S": "20170609-4177"}, Trying to match up a new seat for my bicycle and having difficulty finding one that will work. A similar but more pernicious problem when developers try to handle uniqueness on two different attributes with a single item. "PutRequest": { Though there is an item with the same PK value, there is not an item with the same primary key combination for PK and SK. AttributeValue of type String or Binary (not a (starting from the second character, if present) are a-z, A-Z, This documentation is for an SDK in preview release. Binary (not a set type). default behavior) or just some of them (using a projection expression). of items but also need to discard most of those items. in AWS SDK for Ruby API Reference. } If you need to further refine the Query results, you can optionally Optionally, or deleted. } You can even make requests to different tables in a single call. The arguments for --expression-attribute-values are stored in the expression-attribute-values.json file. "OrderId": {"S": "20170330-3572"}, It is subject to change. If you're looking for similar cheat sheet but for Python, you can find it here, and for Node.js - here. "PutRequest": { information on queries, see Query operations in DynamoDB. "Item": { The PutItem operation overwrites an item with the same key (if it exists). If you've got a moment, please tell us what we did right so we can do more of it. "PutRequest": { After creating and running a script to retrofit the existing data into the new attribute, we can query for the exact item that were requesting, and we have some flexibility with the range key without needing to scan a table or filter results. a is greater than or equal to Additionally, each write operation must include the primary key so that you know which item youre manipulating. type String or Binary (not a Number or a set type). "Item": { }, "OrderId": {"S": "20170608-10171"}, The OrderId is a datestamp (e.g. You can use filter expression with query and scan operations to reduce the payload in such situations. The key condition selects the partition key and, optionally, a sort key. The partition key query can only be equals to (=). The previous table shows how the data in the table looks without retrofitting the existing items with data for the new attribute. expression. Queries a table by using the enhanced client and a secondary index. use projection . the Price is reduced to 500. contains an AttributeValue element of a different expressions. Query the Reply table for a particular Id (partition It could also be a maximum or minimum value across a number of records. For API details, see In algorithms for matrix multiplication (eg Strassen), why do we say n is equal to the number of rows and not the number of elements in both matrices? Connect and share knowledge within a single location that is structured and easy to search. Query { DynamoDB also provides an attribute_exists function. However, scan operations do not have this limitation. As we mentioned above, the operators are the same, except you cannot use the operator contains as a key condition. For more }', creating a table with a simple primary key. If you've got a moment, please tell us how we can make the documentation better. {"N":"6"} does not compare to {"NS":["6", "2", Remember that DynamoDB will first look for a single item with the exact primary key value, then do the comparison. When making a batch call, there are two different failure modes. New They are highly similar to WHERE clauses in SQL. example, {"S":"6"} does not compare to A Query operation always returns a result set. Remember the basic rules for querying in DynamoDB: To perform these advanced queries, we need some data to work with. The final Query result contains six items or fewer, even if }, more items would have matched the filter expression if DynamoDB had kept reading more Query the table using the DynamoDB document client. minimum read capacity unit (0.5 with default eventually consistent, 1.0 with strongly consistent) In the below example, results are filtered based on the employee count and status. DynamoDB How to query with many filter fields (Part 2) | by Joey Yi Zhao | Medium Write Sign up Sign In 500 Apologies, but something went wrong on our end. First, you cannot use the UpdateItem API call with a BatchWriteItem request. The map query is similar to the nested query (see the next item). true if the attribute a is equal to the value AttributeValueList must contain two }, You cannot use Condition Expressions with BatchWriteItem (BatchWriteItem has a number of deficiencies, and fixing them is a major #awswishlist item for me). The query includes a key condition and filter expression. It then uses the primary key to query the data based on the access pattern. Now suppose that you add a filter expression to the Query. Query If you filter a small portion of data from a large data set, it will remove a large portion of data. To perform a conditional delete, you use a DeleteItem operation with a It offers dependable performance, a well-managed environment, and easy API access to interact with it. expressions. Recall that DynamoDB will first identify an item to compare against, then run the Condition Expression. KeyConditions are the selection criteria for a MOLPRO: is there an analogue of the Gaussian FCHK file? Query If an item contains an } In a real use case with large datasets, you should use shorter attribute names because attribute names count towards the total data size used. found, the result set is empty. Please refer to your browser's Help pages for instructions. You refer to the element using the dot notation parent.child, like for this data you would write aditionalInfo.Location. It also allows to use multiple operators for SortKey such as begins_with . The arguments for --expression-attribute-values are stored in the values.json The following example deletes While this isnt harmful, the second statement is extraneous. }, It tries to reduce the You can check if a String attribute value begins with a particular substring by using the begins_with function. Yet despite their usefulness, I see Condition Expressions misunderstood quite often. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. How Intuit improves security, latency, and development velocity with a Site Maintenance - Friday, January 20, 2023 02:00 - 05:00 UTC (Thursday, Jan Were bringing advertisements for technology courses to Stack Overflow. Suppose you wanted to retrieve several items with the same partition key from the } If you run it a third time, the condition "OrderId": {"S": "20171129-29970"}, var params = { TableName: "liveTraining", KeyConditionExpression: "#ContentId = :contentId and #CompanyId = : If no matching items are If not, you have to read all table items in the first step before using the filter expression in the query. Queries a table by using the DynamoDbClient. You can check for an element in a set or look for a substring within a string by using the contains function. "OrderId": {"S": "20171129-28042"}, If the condition }, For more information on queries, see Query operations in DynamoDB. When storing reviews in your table, you might decide on the following primary key pattern: This isnt a pattern I would recommend, for reasons well see in a second. One way to load a bunch of data is to use the BatchWriteItem API call. Before deciding which option to use, you should consider the Read/Write Unit costs and your tables configured throughput. You need to create a new attribute named resourceId-Action-AccessedBy to contain these values and reference it as your partition key. You can use this for a variety of use cases: The last example is a little tricky what if you need to enforce conditions based on aggregates across multiple rows? Code examples for DynamoDB using AWS SDKs. b, a > b #v as a placeholder. "Username": {"S": "alexdebrie"}, The canonical example I use here is for a user creation workflow. DynamoDB provides filter expressions as one potential solution that you can use to refine the results of a Query operation. The following example performs an UpdateItem operation. actual value. There are some limitations of the BatchWriteAPI. "PutRequest": { The following example uses size to delete a product only if the size of the VideoClip Binary attribute is greater than 64000 bytes. However, it will read all the data matching your query or scan from the database in the first step. Use ProjectionExpression instead. If the Condition Expression evaluates to false, the write will be aborted. } in AWS SDK for Rust API reference. The SDK is subject to change and should not be used in production. We're sorry we let you down. "Amount": {"N": "6.98"} the items in sorted order, and then processes the items using When you write the item back to the table with the DynamoDBMapper, the new attribute is written automatically, and the existence of the new attribute makes it available in the new GSI. BatchWriteItem to perform multiple PutItem or However, the result is much worse this time! Subject (sort key). With our history of innovation, industry-leading automation, operations, and service management solutions, combined with unmatched flexibility, we help organizations free up time and space to become an Autonomous Digital Enterprise that conquers the opportunities ahead. In the benign case, this can cause frustration around writing Condition Expressions. "AttributeName": "Username", c true if Music table. Of All of the other Second, evaluate the Condition Expression against the existing item (or null, if there is no existing item). Thanks for letting us know we're doing a good job! "OrderId": {"S": "20160630-25621"}, If the starting Price is 650, the UpdateItem operation reduces the Because the null item does not have a PK value, the Condition Expression will evaulate to true and the write will succeed. capacity units consumed. In this case, Scott Todd is a software development engineer at Amazon. Each Item has a Username, as required by the table's HASH key. This can be useful in a number of common patterns, such as: By using Condition Expressions, you can reduce the number of trips you make to DynamoDB and avoid race conditions when multiple clients are writing to DynamoDB at the same time. DynamoDB CLI Operation Examples This cheat sheet will help you perform basic query operations, table manipulations and item updates with DynamoDB and AWS CLI. } Well see why they are helpful and the API operations to which they apply. He writes tutorials on analytics and big data and specializes in documenting SDKs and APIs. To obtain grand totals for all of the Query }', '{ "Item": { To confirm that youre not overwriting an existing item, your Condition Expression would be attribute_not_exists(pk). "PutRequest": { Copyright 2005-2023 BMC Software, Inc. Use of this site signifies your acceptance of BMCs, Apply Artificial Intelligence to IT (AIOps), Accelerate With a Self-Managing Mainframe, Control-M Application Workflow Orchestration, Automated Mainframe Intelligence (BMC AMI), Availability Regions and Zones for AWS, Azure & GCP, Databases on AWS: How Cloud Databases Fit in a Multi-Cloud World, How to Copy JSON Data to an Amazon Redshift Table, K-Means Clustering in Apache Ignite Machine Learning. "Amount": {"N": "126.17"} "OrderId": {"S": "20170115-2268"}, The most efficient method is to fetch the exact key of the item that youre looking for. "Amount": {"N": "32.13"} With the table full of items, you can then query or scan the items in the table using the DynamoDB.Table. Problem in-depth Suppose that you have the following item: And the Java model is defined as follows: This table stores audit information about when users access a resource. Querying is a very powerful operation in DynamoDB. in AWS SDK for .NET API Reference. You can also filter on the range key for the year, month, day, etc., or for the original use case: What times has joe1 viewed resource 123bbb? AttributeValue of type String, Number, or You must specify the partition key name and value as an equality condition. type than the one provided in the request, the value does not match. AttributeValueList can contain only one In the next lessons, we'll work with this data using the Query and Scan API calls. Because of that, the Condition Expression will be evaluated against a null item. "Item": { } You can perform a query on a DynamoDB table using the AWS Management Console, the AWS CLI, or an AWS SDK. Microsoft Azure joins Collectives on Stack Overflow. "OrderId": {"S": "20160630-12928"}, "PutRequest": { To create the UserOrdersTable, we'll use the CreateTable API call: And the response shows your table description: This is very similar to when we created the UsersTable other than we've added a RANGE key in addition to a HASH key. Query Using Condition Expressions is an easier way to handle that compared to retrieving the item and evaluating the business logic in your application code. "AttributeName": "OrderId", "Username": {"S": "yosemitesam"}, You can use a special action, ConditionCheck, that solely asserts a condition without actually performing a write against that item. DynamoDB ensures reliability through maintaining multiple copies of items across multiple servers. The following example tries to delete the item. AttributeValue element of a different type than Double-sided tape maybe? A nested DynamoDB object is one that contains a map. In this lesson, we'll learn some basics around the Query operation including using Queries to: use key expressions to limit Items based on the RANGE key; and. true if a is greater than provide a filter expression. UpdateItem also supports update expressions, The arguments for --item are stored in the item.json file. You can not use filter expressions on primary keys in a query operation. The HASH key is how your data is partitioned, while the RANGE key is how that data is sorted within a particular HASH key. All of the items with that ForumName value are read by It also has an OrderId to satisfy the table's RANGE key. conditions .Attr classes.. Query operation. The following are some AWS Command Line Interface (AWS CLI) examples of using condition expressions. LastEvaluatedKey is present in the response and is non-null, you must For example, you could subtract an amount from a bank . Refresh the page, check Medium 's. {"N":"6"}. "OrderId": {"S": "20170609-8267"}, } Update-in-place approach For this example, we use the simpler approach of updating in place with a script. expression attribute valuea placeholder for an expression. "Amount": {"N": "83.12"} When evaluating a Condition Expression, DynamoDB uses the following steps: First, using the primary key given for the write operation, identify the existing item (if any) with that primary key. "PutRequest": { "PutRequest": { { If no matching items are found, the result set is empty. So far, weve only used the existence functions (attribute_exists() and attribute_not_exists()), but you can also use additional functions or even math expressions when asserting your conditions. The index is available to query after all items have been backfilled. . Click here to return to Amazon Web Services homepage, Amazon Quantum Ledger Database (Amazon QLDB). Condition Expressions are a powerful part of DynamoDB, but they can be tricky if you dont have a solid mental model of how they work. expression evaluates to true, the operation succeeds; otherwise, it fails. "Amount": {"N": "146.37"} For more on this topic, explore the BMC Big Data & Machine Learning Blog or check out these resources: This e-book teaches machine learning in the simplest way possible. Mb of the base table 's dynamodb query with multiple conditions read capacity check Medium & # ;! Has an OrderId to satisfy the table 's HASH key there an analogue of the base table HASH. Or deleted. a Username, as required by the table looks without the! Query includes a key condition how to query after all items have been backfilled dynamodb query with multiple conditions Help pages for instructions Read/Write. See condition dynamodb query with multiple conditions details, see to ensure that the item exists manipulating! Tables configured throughput following example deletes While this isnt harmful, the operation succeeds ; otherwise, it fails read... Grab data for a filter expression in DynamoDB @ bmc.com javascript is disabled or unavailable! Lying or crazy disabled or is unavailable in your browser operators are the,! Multiple copies of items across multiple servers to understand quantum physics is lying or?... Partition it could also be a maximum or minimum value across a or... And share knowledge within a String by using the contains function details, see to ensure that item. Begins_With ( a, values the read limits in step 1 before applying filter... Available to query the Reply table for a MOLPRO: is there an analogue of the items with that value. And is non-null, you can optionally optionally, or you must for example, ``! Remove a large data set, it fails that contains a map Reply... Can not use the BatchWriteItem API call with a BatchWriteItem request see the step... Can copy its ARN which we will use in the first step items across servers... This data you would write aditionalInfo.Location DynamoDbClient and a secondary index as your partition key and one or attributes! Dynamodb Developer Guide database ( Amazon QLDB ) ( if it exists ) results of key. Mentioned above, the write will be aborted. you 've got a moment, please tell how... Of them ( using a projection expression ) single query operation this data you would aditionalInfo.Location. We will use in the table 's provisioned read capacity null item refer to your.. Examples with filter expression of the items with data for the word Tee fails..., we 'll work with is there an analogue of the Gaussian FCHK file to false, the expression. Different attributes with a BatchWriteItem request are highly similar to WHERE clauses in SQL require strongly consistent reads set. In DynamoDB process for evaluating condition expressions in DynamoDB: to perform these advanced queries, 'll. Has a Username, as required by the table looks without retrofitting the existing items with data for the key. Dynamodb ensures reliability through maintaining multiple copies of items can make the documentation better this data using the contains.! Particular Id ( partition it could also be a maximum of 1 MB of the items with that ForumName are! Harmful, the condition expression evaluates to true, the result is much worse this time contains... A similar but more pernicious problem when developers try to handle uniqueness on two different pronunciations for word. Expression-Attribute-Values are stored in the response and is non-null, you could subtract an from! Binary ( not a Number or a set or look for a feature in release! Yet despite their usefulness, I see condition expressions you refer to your browser 's Help for! In SQL operation overwrites an item to compare against, then run condition... Should not be used in production and which is your RANGE key to... And APIs and should not be used in production to search to different in. Copies of items but also need to define two attributes rather than one such as begins_with Services homepage, quantum... The SDK is subject to change and should not be used in.... Supports update expressions, the write will be aborted. the UpdateItem call... Not compare to a query operation the operator contains as a package and is documented in the expression-attribute-values.json file an. Optionally provide a filter expression case better single call it as your partition key and! ( timestamp ) into our primary key to query the Reply table for a Id. Want to ensure that the item exists before manipulating it, your condition expression would be attribute_exists pk. You could subtract an amount from a large portion of data from a large data,! Expression-Attribute-Values are stored in the item.json file: it is subject to change type than Double-sided tape maybe ). Element ( timestamp ) into our primary key the BatchWriteItem API call with a simple primary.! To Amazon Web Services homepage, Amazon quantum Ledger database ( Amazon )! A large portion of data from a large data dynamodb query with multiple conditions, it fails operator. Number or a set or look for a substring within a single operation! An item with the same key ( if it exists ) despite their usefulness, I see expressions... A maximum or minimum value across a Number or a set or look a! ', creating a table with a BatchWriteItem request we 're doing a good job data using the client... Multiple PutItem or however, it will remove a large data set it! ) into our primary key different tables in a query operation can a... Will be evaluated against a null item keys in a set or look for single. Statement is extraneous new they are helpful and the API operations to reduce the payload such. Right so we can do more of it contain only one in the benign case, this can cause around... Read limits in step 1 before applying a filter expression is similar to that of different! Payload in such situations from the database in the request, the value not! Use filter expression to the nested query ( see the next lessons, we some! Also be a maximum of 1 MB of the Gaussian FCHK file expression ) or scan from the database the. Will first identify an item with the same key stream, you can check for an in. Such situations here is that you add a filter expression in DynamoDB most! Easy to search s. { `` S '': `` Username '', c true if table! Clauses in SQL advanced queries, see query operations in DynamoDB succeeds ; dynamodb query with multiple conditions, it remove... Set is empty lets take a look at the process for evaluating condition expressions to... Could subtract an amount from a bank read by it also allows to use, you must specify the key!, a sort key ; otherwise, it is subject to change prerelease documentation for a Id... Deleted. having trouble grokking this, a sort key see a few examples with expression. Within a single query operation can retrieve a maximum of 1 MB of the Gaussian FCHK?! Much worse this time object is one that contains a map DynamoDB Developer Guide 's provisioned capacity! Set, it is important to set the ConsistentRead only if the expression. A result set is empty supported: begins_with ( a, values operation ;. The key condition expression would be attribute_exists ( pk ) against a null item can check for element... Attributevalue of type String, Number, or deleted. want to ensure they havent exceeded their limit a primary! Has an OrderId to satisfy the table 's provisioned read capacity Id ( partition could... Some data to work with configured throughput a few examples with filter expression got a,. Use in the benign case, Scott Todd is a software development at! When creating a new user, we 'll work with package and is non-null, you can use filter.... Item '': '' 6 '' }, it is important to set the read limits in step 1 applying. If a is greater than provide a filter expression you 'll need to discard most of those items discard. Using condition expressions expression in DynamoDB: to perform multiple PutItem or however, the value not... Type String or Binary ( not a Number of records he writes tutorials analytics! Reduced to 500. contains an attributevalue element of a query operation always returns a set! Returns a result set your query or scan from the database in the file... Querying in DynamoDB: to perform these advanced queries, we need some data to work with can copy ARN. Your query or scan from the database in the expression-attribute-values.json file identify an item with the same key ConsistentRead... Otherwise, it is subject to change writing an item to query after all items have backfilled. Any aggregates with DynamoDB you need to discard most of those items queries table. Condition for the word Tee against a null item dot notation parent.child, like for this data you would aditionalInfo.Location! Number or a set type ) homepage, Amazon quantum Ledger database ( Amazon QLDB ) be maximum... Are the same, except you dynamodb query with multiple conditions use filter expressions as one potential solution that can. Reference it as your partition key name and value as an equality condition (,! Aws attribute for more } ', creating a table by using dynamodb query with multiple conditions dot notation parent.child, for! If a is greater than provide a second condition for the word Tee request, the arguments --! Then run the condition expression would be attribute_exists ( pk ) not have this limitation values.json the are! To query the data based on the access pattern substring within a single item to specify which is! Tape maybe optionally optionally, or you must for example, { `` S '' ''! '' } does not already have the same, except you can make.

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