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POMongoDB - file size is huge and growing
 

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    <p>I have an application that use mongo for storing short living data. All data older than 45 minutes is removed by script something like:</p> <pre><code>oldSearches = [list of old searches] connection = Connection() db = connection.searchDB res = db.results.remove{'search_id':{"$in":oldSearches}}) </code></pre> <p>I've checked current status - </p> <pre><code>&gt;db.results.stats() { "ns" : "searchDB.results", "count" : 2865, "size" : 1003859656, "storageSize" : 29315124464, "nindexes" : 1, "ok" : 1 } </code></pre> <p>So, according to this 1gb of data occupies 29GB of storage. Data folder looks like this(You may see that many files are very old - last accessed in the middle of may):</p> <pre><code>ls -l /var/lib/mongodb/ total 31506556 -rwxr-xr-x 1 mongodb nogroup 6 2011-06-05 18:28 mongod.lock -rw------- 1 mongodb nogroup 67108864 2011-05-13 17:45 searchDB.0 -rw------- 1 mongodb nogroup 134217728 2011-05-13 14:45 searchDB.1 -rw------- 1 mongodb nogroup 2146435072 2011-05-20 20:45 searchDB.10 -rw------- 1 mongodb nogroup 2146435072 2011-05-28 00:00 searchDB.11 -rw------- 1 mongodb nogroup 2146435072 2011-05-27 13:45 searchDB.12 -rw------- 1 mongodb nogroup 2146435072 2011-05-29 16:45 searchDB.13 -rw------- 1 mongodb nogroup 2146435072 2011-06-07 13:50 searchDB.14 -rw------- 1 mongodb nogroup 2146435072 2011-06-06 01:45 searchDB.15 -rw------- 1 mongodb nogroup 2146435072 2011-06-07 13:50 searchDB.16 -rw------- 1 mongodb nogroup 2146435072 2011-06-07 13:50 searchDB.17 -rw------- 1 mongodb nogroup 2146435072 2011-06-06 09:07 searchDB.18 -rw------- 1 mongodb nogroup 268435456 2011-05-13 14:45 searchDB.2 -rw------- 1 mongodb nogroup 536870912 2011-05-11 00:45 searchDB.3 -rw------- 1 mongodb nogroup 1073741824 2011-05-29 23:37 searchDB.4 -rw------- 1 mongodb nogroup 2146435072 2011-05-13 17:45 searchDB.5 -rw------- 1 mongodb nogroup 2146435072 2011-05-18 17:45 searchDB.6 -rw------- 1 mongodb nogroup 2146435072 2011-05-16 01:45 searchDB.7 -rw------- 1 mongodb nogroup 2146435072 2011-05-17 13:45 searchDB.8 -rw------- 1 mongodb nogroup 2146435072 2011-05-23 16:45 searchDB.9 -rw------- 1 mongodb nogroup 16777216 2011-06-07 13:50 searchDB.ns -rw------- 1 mongodb nogroup 67108864 2011-04-23 18:51 test.0 -rw------- 1 mongodb nogroup 16777216 2011-04-23 18:51 test.ns </code></pre> <p>According to "top" mongod uses 29G of virtual memory ( and 780Mb of RSS)</p> <p>Why do i have such abnormal values? Do i need to run something additional to .remove() function to clean up database from old values?</p>
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    1. COOut of interest, have you investigated using Capped Collections for this kind of problem? This would remove the problems of disk space, remove the need for a removal script and may make the app faster...
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    2. COAs a sidenote: For such short-lived data I would use Redis which supports expire-timeout on any data.
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      1. USAndreas Bergström
    3. COMongo is just plain storage heavy. BSON takes up a lot of space because it stores the full key name as well as the value for each field in a document. As others have said, there are workarounds, but you will need to accept large file system use if you use MongoDB.
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