05-20-2010
Quote:
Originally Posted by
methyl
We must assume you have a mainstream database engine which can handle CSV files and a computer which has capacity for this task. You really don't mention much about the data or the computer.
At a design level, each record must contain a unique key and whatever information is a parameter to the "purge". Unless you know the source "purge" rules your database of "data already processed" will just grow.
It would make more sense to fix the data feed design at at source. A convention is to mark the record in the source database with a unique extract run reference to prevent repeat extracts - whilst also allowing a rerun.
Unique key - this is not required, record as a whole could be unique and there is no need for unique columns in it. Worst, after applying normalization or some form of transformation, 2 records could be unique or not be so.
Fixing the problem at scope, is definitely out of question, though I agree it makes sense to do that, most of the time, its completely out of scope. Not everything flows in line. We need to work on what has been received or what could be potentially received in a real world scenario.
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LEARN ABOUT CENTOS
tcamgr
TCATEST(3) Tokyo Cabinet TCATEST(3)
NAME
tcamgr - the command line utility of the abstract database API
DESCRIPTION
The command `tcamgr' is a utility for test and debugging of the abstract database API and its applications. `name' specifies the name of a
database. `key' specifies the key of a record. `value' specifies the value of a record. `params' specifies the tuning parameters.
`func' specifies the name of a function. `arg' specifies the arguments of the function. `dest' specifies the path of the destination
file.
tcamgr create name
Create a database file.
tcamgr inform name
Print miscellaneous information to the standard output.
tcamgr put [-sx] [-sep chr] [-dk|-dc|-dai|-dad] name key value
Store a record.
tcamgr out [-sx] [-sep chr] name key
Remove a record.
tcamgr get [-sx] [-sep chr] [-px] [-pz] name key
Print the value of a record.
tcamgr list [-sep chr] [-m num] [-pv] [-px] [-fm str] name
Print keys of all records, separated by line feeds.
tcamgr optimize name params
Optimize a database file.
tcamgr misc [-sx] [-sep chr] [-px] name func [arg...]
Call a versatile function for miscellaneous operations.
tcamgr map [-fm str] name dest
Map records into another B+ tree database.
tcamgr version
Print the version information of Tokyo Cabinet.
Options feature the following.
-sx : the input data is evaluated as a hexadecimal data string.
-sep chr : specify the separator of the input data.
-dk : use the function `tcadbputkeep' instead of `tcadbput'.
-dc : use the function `tcadbputcat' instead of `tcadbput'.
-dai : use the function `tcadbaddint' instead of `tcadbput'.
-dad : use the function `tcadbadddouble' instead of `tcadbput'.
-px : the output data is converted into a hexadecimal data string.
-pz : do not append line feed at the end of the output.
-m num : specify the maximum number of the output.
-pv : print values of records also.
-fm str : specify the prefix of keys.
This command returns 0 on success, another on failure.
SEE ALSO
tcatest(1), tcamttest(1), tcadb(3), tokyocabinet(3)
Man Page 2012-08-18 TCATEST(3)