List of defrag() Examples

Examples of defrag()

jdbm.RecordManager.defrag()
Defragments storage, so it consumes less space. This commits any uncommited data. @throws IOException
jdbm.recman.BaseRecordManager.defrag()
org.apache.jdbm.DB.defrag()
Defragments storage so it consumes less space. It basically copyes all records into different store and then renames it, replacing original store.
Defrag has two steps: In first collections are rearranged, so records in collection are close to each other, and read speed is improved. In second step all records are sequentially transferred, reclaiming all unused space. First step is optinal and may slow down defragmentation significantly as ut requires many random-access reads. Second step reads and writes data sequentially and is very fast, comparable to copying files to new location.
This commits any uncommited data. Defrag also requires free space, as store is basically recreated at new location. @param sortCollections if collection records should be rearranged during defragment, this takes some extra time

Examples of jdbm.RecordManager.defrag()

    PrimaryTreeMap<Long, String> map = recman.treeMap("aa");
    for(long i = init; i<init+size;i++){
      map.put(i, "");      
    }
    recman.commit();
    recman.defrag();
    recman.close();
    long fileSize = new File(file+".dbr.0").length()/1024;
    System.out.println("file size: "+fileSize);
    assertTrue("file is too big, compression failed", fileSize<1000);
  }

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Examples of jdbm.RecordManager.defrag()

    PrimaryTreeMap<String, String> map = recman.treeMap("aa");
    for(long i = init; i<init+size/10;i++){
      map.put("aaaaa"+i, "");      
    }
    recman.commit();
    recman.defrag();    
    recman.close();
    recman = new BaseRecordManager(file);
    map = recman.treeMap("aa");
    for(long i = init; i<init+size/10;i++){
      assertTrue(map.containsKey("aaaaa"+i));

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Examples of jdbm.RecordManager.defrag()

      assertTrue(t.containsKey(""+key+"aaa"));
      assertTrue(h.size() == 1);
      assertTrue(h.containsKey(""+key+"aaa"));
      
      //defrag will force reopening
      recman.defrag();
      recman.clearCache();
      
      assertTrue(t.size() == 1);
      assertTrue(t.containsKey(""+key+"aaa"));
      assertTrue(h.size() == 1);

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Examples of jdbm.recman.BaseRecordManager.defrag()

    PrimaryTreeMap<Long, String> map = recman.treeMap("aa");
    for(long i = init; i<init+size;i++){
      map.put(i, "");      
    }
    recman.commit();
    recman.defrag();
    recman.close();
    long fileSize = new File(file+".dbr.0").length()/1024;
    System.out.println("file size: "+fileSize);
    assertTrue("file is too big, compression failed", fileSize<1000);
  }

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Examples of jdbm.recman.BaseRecordManager.defrag()

    PrimaryTreeMap<String, String> map = recman.treeMap("aa");
    for(long i = init; i<init+size/10;i++){
      map.put("aaaaa"+i, "");      
    }
    recman.commit();
    recman.defrag();    
    recman.close();
    recman = new BaseRecordManager(file);
    map = recman.treeMap("aa");
    for(long i = init; i<init+size/10;i++){
      assertTrue(map.containsKey("aaaaa"+i));

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Examples of org.apache.jdbm.DB.defrag()

            }
//            test.add(i);
            map.put(i,i.hashCode());
        }


        db.defrag(true);
        db.close();


        System.out.println("Finished, total time: " + (System.currentTimeMillis() - startTime) / 1000);
    }
}

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