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Full Discussion: deleting multiple records from a huge file at one time
Top Forums Shell Programming and Scripting deleting multiple records from a huge file at one time Post 302164649 by fpmurphy on Tuesday 5th of February 2008 12:19:07 PM
Old 02-05-2008
What do you mean by "with out opening the file"? You cannot delete records without opening the file.

Is this file a structured file or a database file? Are the records in the file sorted or random? You seem to indicate that the records are random but I am unclear if you are referring to the file or the list of records to be deleted.

You need to provide more precise information if you want somebody to help you.
 

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LEARN ABOUT DEBIAN

tchmttest

TCHMTTEST(1)							   Tokyo Cabinet						      TCHMTTEST(1)

NAME

       tchmttest - test cases of the hash database API

DESCRIPTION

       The command `tchmttest' is a utility for facility test under multi-thread situation.  This command is used in the following format.  `path'
       specifies the path of a database file.  `tnum' specifies the number of running threads.	`rnum' specifies the number of iterations.  `bnum'
       specifies the number of buckets.  `apow' specifies the power of the alignment.  `fpow' specifies the power of the free block pool.

	      tchmttest write [-tl] [-td|-tb|-tt|-tx] [-rc num] [-xm num] [-df num] [-nl|-nb] [-as] [-rnd] path tnum rnum [bnum [apow [fpow]]]
		     Store records with keys of 8 bytes.  They change as `00000001', `00000002'...
	      tchmttest read [-rc num] [-xm num] [-df num] [-nl|-nb] [-wb] [-rnd] path tnum
		     Retrieve all records of the database above.
	      tchmttest remove [-rc num] [-xm num] [-df num] [-nl|-nb] [-rnd] path tnum
		     Remove all records of the database above.
	      tchmttest wicked [-tl] [-td|-tb|-tt|-tx] [-nl|-nb] [-nc] path tnum rnum
		     Perform updating operations selected at random.
	      tchmttest typical [-tl] [-td|-tb|-tt|-tx] [-rc num] [-xm num] [-df num] [-nl|-nb] [-nc] [-rr num] path tnum rnum [bnum [apow [fpow]]
		     Perform typical operations selected at random.
	      tchmttest race [-tl] [-td|-tb|-tt|-tx] [-xm num] [-df num] [-nl|-nb] path tnum rnum [bnum [apow [fpow]]
		     Perform race condition test.

       Options feature the following.

	      -tl : enable the option `HDBTLARGE'.
	      -td : enable the option `HDBTDEFLATE'.
	      -tb : enable the option `HDBTBZIP'.
	      -tt : enable the option `HDBTTCBS'.
	      -tx : enable the option `HDBTEXCODEC'.
	      -rc num : specify the number of cached records.
	      -xm num : specify the size of the extra mapped memory.
	      -df num : specify the unit step number of auto defragmentation.
	      -nl : enable the option `HDBNOLCK'.
	      -nb : enable the option `HDBLCKNB'.
	      -as : use the function `tchdbputasync' instead of `tchdbput'.
	      -rnd : select keys at random.
	      -wb : use the function `tchdbget3' instead of `tchdbget'.
	      -nc : omit the comparison test.
	      -rr num : specify the ratio of reading operation by percentage.

       This command returns 0 on success, another on failure.

SEE ALSO

       tchtest(1), tchmgr(1), tchdb(3), tokyocabinet(3)

Man Page							    2011-02-12							      TCHMTTEST(1)
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