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Top Forums Programming Best way to dump metadata to file: when and by who? Post 302330035 by otheus on Tuesday 30th of June 2009 05:07:09 AM
Old 06-30-2009
Wow, what a question. Are you re-engineering a database system?
Quote:
- When and how it's best time to dump the tables to a file?
On slightly-less than gigabyte boundaries. Actually, 256 kB blocks also work very well.
Quote:
- Who should dump the metadata produced to file? Different thread?
If it's in a different thread, what's the point? You can't just free the memory if the other thread still has a lock on it.
Quote:
What policy should I use to load the data
I don't think that's answerable unless one really knows your existing software architecture.
 

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JSON_XS(1p)						User Contributed Perl Documentation					       JSON_XS(1p)

NAME
json_xs - JSON::XS commandline utility SYNOPSIS
json_xs [-v] [-f inputformat] [-t outputformat] DESCRIPTION
json_xs converts between some input and output formats (one of them is JSON). The default input format is "json" and the default output format is "json-pretty". OPTIONS
-v Be slightly more verbose. -f fromformat Read a file in the given format from STDIN. "fromformat" can be one of: json - a json text encoded, either utf-8, utf16-be/le, utf32-be/le storable - a Storable frozen value storable-file - a Storable file (Storable has two incompatible formats) clzf - Compress::LZF format (requires that module to be installed) yaml - YAML (avoid at all costs, requires the YAML module :) eval - evaluate the given code as (non-utf-8) Perl, basically the reverse of "-t dump" -t toformat Write the file in the given format to STDOUT. "toformat" can be one of: json, json-utf-8 - json, utf-8 encoded json-pretty - as above, but pretty-printed json-utf-16le, json-utf-16be - little endian/big endian utf-16 json-utf-32le, json-utf-32be - little endian/big endian utf-32 storable - a Storable frozen value in network format storable-file - a Storable file in network format (Storable has two incompatible formats) clzf - Compress::LZF format yaml - YAML dump - Data::Dump dumper - Data::Dumper Note that Data::Dumper doesn't handle self-referential data structures correctly - use "dump" instead. EXAMPLES
json_xs -t null <isitreally.json "JSON Lint" - tries to parse the file isitreally.json as JSON - if it is valid JSON, the command outputs nothing, otherwise it will print an error message and exit with non-zero exit status. <src.json json_xs >pretty.json Prettify the JSON file src.json to dst.json. json_xs -f storable-file <file Read the serialised Storable file file and print a human-readable JSON version of it to STDOUT. json_xs -f storable-file -t yaml <file Same as above, but write YAML instead (not using JSON at all :) lwp-request http://cpantesters.perl.org/show/JSON-XS.json | json_xs Fetch the cpan-testers result summary "JSON::XS" and pretty-print it. AUTHOR
Copyright (C) 2008 Marc Lehmann <json@schmorp.de> perl v5.14.2 2010-08-17 JSON_XS(1p)
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