Note that the backup at first resides on the Global write lock across all databases can be obtained in order to Phrase “as soon as possible” refers to the next window during which a Like a snapshot in time, with a given label.

This is only available in the cluster.Ĭreates a consistent backup “as soon as possible”, very much If bothĪllowInconsistent and force are set to true, then the latter takes The default and recommended value is false. Use at your own risk, and only if you need a consistent backup atĪll costs. In the presence of intermediate commits it can even destroy the atomicity of your To abort transactions is almost certainly not what you want for your application. Thus using force the request timeout is doubled. It waits for the transactions to be aborted at most Within the given timeout, all running transactions are forcefully aborted toĮnsure that a consistent backup can be created. If this flag is set to true and no global transaction lock can be acquired The default for this flag is false and in this case If this flag is set to true and no global transaction lock can beĪcquired within the given timeout, a possibly inconsistent backup The time in seconds that the operation tries to get a consistent If no label is specified, the empty string is assumed and a default Timestamp string create a unique backup identifier, _. Make sure to understand all aspects of hot backups, most of all the requirements and limitations, before using the API. Instead of returning the raw doc, one can easily create a projection: FOR doc IN users RETURN IN test RETURN NEW. Each document is returned unchanged in this The following queryĮxecutes the loop body for all documents of a collection called users. RETURN is usually accompanied by a FOR loop to iterate over the documents of a collection. The function DOCUMENT() can be called to retrieve a single document via its document handle, for instance: RETURN DOCUMENT ( ' users/phil ' ) The query result is always an array of elements, even if a single element was returned and contains a single element in It can be used to return a static value, such as a string: RETURN ' Hello ArangoDB! ' Retrieving data from the database with AQL does always include a RETURN operation. queries which modify data (create, update, replace, delete documents).queries which access data (read documents).There are two fundamental types of AQL queries:

* this is a comment */ RETURN 1 /* these */ RETURN /* are */ 1 /* multiple */ + /* comments */ 1 /* this isĪn example AQL query may look like this: FOR u IN users FILTER u. They can span as many lines as necessary. Multi line comments: These start with a forward slash and asterisk, and end with an asterisk and a following forward.Single line comments: These start with a double forward slash and end at the end of the line, or the end of the query.The AQL parser will return an error if it detects more than one data-modification operation in the same query or if itĬannot figure out if the query is meant to be a data retrieval or a modification operation.ĪQL only allows one query in a single query string CommentsĬomments can be embedded at any position in a query. execute a data-modification operation (indicated by usage of one of the keywords INSERT, UPDATE, REPLACE,.return a result (indicated by usage of the RETURN keyword) or.Using Filters and the Explainer to Extrapolate the Costs.Understand for anyone with an SQL background. The syntax of AQL queries is different to SQL, even if some keywords overlap. It is a pure data manipulation language (DML), not a data definition language (DDL) or a data control language

AQL supports reading and modifying collectionĭata, but it doesn’t support data-definition operations such as creating and dropping databases, collections and In its purpose, AQL is similar to the Structured Query Language (SQL). Further design goals of AQL were the support of complex query patterns and the Programming language the clients may use. Goal of AQL was client independency, meaning that the language and syntax are the same for all clients, no matter what AQL aims to be human-readable and therefore uses keywords from the English language. The ArangoDB Query Language (AQL) can be used to retrieve and modify data that are stored in ArangoDB.ĪQL is mainly a declarative language, meaning that a query expresses what result should be achieved but not how it

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