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→Read Operations
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| '''Summary'''
|Opens the database {{Code|$db}} and returns the node with the specified {{Code|$id}} value.<br />Each database node has a ''persistent'' [[Node Storage#Node TableID Value|ID value]]. Access to the node id can be sped up by turning on the [[Options#UPDINDEX|UPDINDEX]] option.
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| '''Errors'''
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| '''Summary'''
|Opens the database {{Code|$db}} and returns the node with the specified {{Code|$pre}} value.<br/>The [[Node Storage#Node TablePRE Value|PRE pre value]] provides access to a database node in constant time, but it will change whenever a node with a smaller ''pre'' values is added to or deleted from a database.
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| '''Errors'''
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| '''Summary'''
|Returns the ''id'' values of the nodes supplied by {{Code|$nodes}}, which must all be [[#Database Nodes|database nodes]].<br/>Each database node has a ''persistent'' [[Node Storage#Node TableID Value|ID value]]. Access to the node id can be sped up by turning on the [[Options#UPDINDEX|UPDINDEX]] option.
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| '''Errors'''
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| '''Summary'''
|Returns the ''pre'' values of the nodes supplied by {{Code|$nodes}}, which must all be [[#Database Nodes|database nodes]].<br/>The [[Node Storage#Node TablePRE Value|PRE value]] provides access to a database node in constant time, but it will change whenever a node with a smaller ''pre'' values is added to or deleted from a database.
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| '''Errors'''
