On Fri, Apr 27, 2012 at 8:28 AM, Cary Lewis <cary.le...@gmail.com> wrote:
> I have a system that makes use of a number of directories which
> contain hundreds of thousands of files.
Cary, I can't comment on any API references, but here is a possible workaround.
The "locate" command works similarly to the "find" command, but
consults a special database (which you can re-generate at any time)
for quick access.
Then, when searching for a directory name or file name, you can use
the "locate" command and the collection of separate "locatedb"
databases, which will return results very quickly
Note - whenever files are added, deleted, or renamed in any of the
hypothetical "somedir_0n" directories, the "updatedb" command will
have to be run again to create the locatedb databases.
The "locate -S -d /var/locatedb_somedir_0n" command outputs statistics
on the database just created ,showing the number of filenames in each
and other stats.
Example:
1. Suppose the following directories exist on your SAN, and each of
"somedir_nn" contains about 100,000 files each.
/san_main_dir/corp_files/somedir_01
/san_main_dir/corp_files/somedir_02
/san_main_dir/corp_files/somedir_03
/san_main_dir/corp_files/somedir_04
[ .....ad nauseum..... ]
/san_main_dir/corp_files/somedir_nn
2. Put the following lines into a script (e.g.
create_san_locatedb.sh,) which will create a separate "locatedb"
database for each subdirectory:
#!/bin/bash
# Create separate locatedb databases for directories containing a
large number of files on a SAN.
time updatedb --localpaths='/san_main_dir/corp_files/somedir_01'
--output=/var/locatedb_somedir_01 2>/dev/null
echo "locatedb_somedir_01 created..."
echo
locate -S -d /var/locatedb_somedir_01
echo
time updatedb --localpaths='/san_main_dir/corp_files/somedir_02'
--output=/var/locatedb_somedir_02 2>/dev/null
echo "locatedb_somedir_02 created..."
echo
locate -S -d /var/locatedb_somedir_02
echo
time updatedb --localpaths='/san_main_dir/corp_files/somedir_03'
--output=/var/locatedb_somedir_03 2>/dev/null
echo "locatedb_somedir_03 created..."
echo
locate -S -d /var/locatedb_somedir_03
echo
time updatedb --localpaths='/san_main_dir/corp_files/somedir_04'
--output=/var/locatedb_somedir_04 2>/dev/null
echo "locatedb_somedir_04 created..."
echo
locate -S -d /var/locatedb_somedir_04
echo
echo "Custom locatedb directories created"
3. Now that the databases are created, here are some example commands
to find the directory and filenames within:
Show a list of files ending in "DAT2012" from the database
locatedb_somedir_03:
locate --database=/var/locatedb_somedir_03 "*DAT2012"
Show a list of files, (ignoring cAsE sEnSiTiViTy,) with "dAt2012"
anywhere in the directory path
or in the filename, from the database locatedb_somedir_03:
locate -i --database=/var/locatedb_somedir_03 "dat2012"
Show a list of files with "DAT2012" with a preceding directory name
containing "uncooked",
from the database locatedb_somedir_01:
locate --database=/var/locatedb_somedir_01 "*uncooked*DAT2012"
Show a list of files with "DAT2012" with a preceding file or
directory name containing "uncooked",
from the database locatedb_somedir_01:
locate --database=/var/locatedb_somedir_01 "*uncooked*DAT2012"
Search across all four hypothetical locatedb_somedir_0n databases
using four separate command lines:
locate --database=/var/locatedb_somedir_01 "DAT2012"
locate --database=/var/locatedb_somedir_02 "DAT2012"
locate --database=/var/locatedb_somedir_03 "DAT2012"
locate --database=/var/locatedb_somedir_04 "DAT2012"
4. If the directory names or file names below /san_main_dir/corp_files
change after the "locatedb_somedir_0n" databases are created, new
files won't be found using "locate," and items deleted since the
previous steps in (2) above will still appear until the databases are
re-created. Re-run Step 2 if this is the case. The "time" commands
before each updatedb command will help gauge how long it takes to
create the "locatedb" databases.
========Keith
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