Page store: reduce database size.

h2/src/main/org/h2/index/Page.java

@@ -7,7 +7,11 @@
 package org.h2.index;
 
 /**
- * A page.
+ * A page. Format:
+ * <ul><li>0-3: parent page id (0 for root)
+ * </li><li>4-4: page type
+ * </li><li>page-type specific data
+ * </li></ul>
  */
 public class Page {
 

h2/src/main/org/h2/index/PageBtreeLeaf.java

@@ -60,17 +60,21 @@ class PageBtreeLeaf extends PageBtree {
         int last = entryCount == 0 ? pageSize : offsets[entryCount - 1];
         if (last - rowLength < start + OFFSET_LENGTH) {
             if (entryCount > 1) {
-                return entryCount / 2;
+                // split at the insertion point to better fill pages
+                // split in half would be:
+                // return entryCount / 2;
+                int x = find(row, false, true, true);
+                return x < 2 ? 2 : x >= entryCount - 3 ? entryCount - 3 : x;
             }
             onlyPosition = true;
             // change the offsets (now storing only positions)
             int o = pageSize;
             for (int i = 0; i < entryCount; i++) {
-                o -= index.getRowSize(data, getRow(i), onlyPosition);
+                o -= index.getRowSize(data, getRow(i), true);
                 offsets[i] = o;
             }
             last = entryCount == 0 ? pageSize : offsets[entryCount - 1];
-            rowLength = index.getRowSize(data, row, onlyPosition);
+            rowLength = index.getRowSize(data, row, true);
             if (SysProperties.CHECK && last - rowLength < start + OFFSET_LENGTH) {
                 throw Message.throwInternalError();
             }

h2/src/main/org/h2/index/PageBtreeNode.java

@@ -105,11 +105,11 @@ class PageBtreeNode extends PageBtree {
             // change the offsets (now storing only positions)
             int o = pageSize;
             for (int i = 0; i < entryCount; i++) {
-                o -= index.getRowSize(data, getRow(i), onlyPosition);
+                o -= index.getRowSize(data, getRow(i), true);
                 offsets[i] = o;
             }
             last = entryCount == 0 ? pageSize : offsets[entryCount - 1];
-            rowLength = index.getRowSize(data, row, onlyPosition);
+            rowLength = index.getRowSize(data, row, true);
             if (SysProperties.CHECK && last - rowLength < start + CHILD_OFFSET_PAIR_LENGTH) {
                 throw Message.throwInternalError();
             }

h2/src/main/org/h2/index/PageDataLeaf.java

@@ -97,9 +97,11 @@ class PageDataLeaf extends PageData {
         int pageSize = index.getPageStore().getPageSize();
         int last = entryCount == 0 ? pageSize : offsets[entryCount - 1];
         if (entryCount > 0 && last - rowLength < start + KEY_OFFSET_PAIR_LENGTH) {
-            if (entryCount > 1) {
-                return entryCount / 2;
-            }
+            // split at the insertion point to better fill pages
+            // split in half would be:
+            // if (entryCount > 1) {
+            //     return entryCount / 2;
+            // }
             return find(row.getPos());
         }
         int offset = last - rowLength;

h2/src/main/org/h2/res/javadoc.properties

@@ -19,6 +19,6 @@ org.h2.tools.RunScript.main=Options are case sensitive. Supported options are\:\
 org.h2.tools.Script=Creates a SQL script file by extracting the schema and data of a database.
 org.h2.tools.Script.main=Options are case sensitive. Supported options are\:\n[-help] or [-?]    Print the list of options\n[-url "<url>"]     The database URL (jdbc\:...)\n[-user <user>]     The user name (default\: sa)\n[-password <pwd>]  The password\n[-script <file>]   The target script file name (default\: backup.sql)\n[-options ...]     A list of options (only for embedded H2, see RUNSCRIPT)\n[-quiet]           Do not print progress information
 org.h2.tools.Server=Starts the H2 Console (web-) server, TCP, and PG server.
-org.h2.tools.Server.main=When running without options, -tcp, -web, -browser and -pg are started.\nOptions are case sensitive. Supported options are\:\n[-help] or [-?]         Print the list of options\n[-web]                  Start the web server with the H2 Console\n[-webAllowOthers]       Allow other computers to connect\n[-webPort <port>]       The port (default\: 8082)\n[-webSSL]               Use encrypted (HTTPS) connections\n[-browser]              Start a browser and open a page to connect to the web server\n[-tcp]                  Start the TCP server\n[-tcpAllowOthers]       Allow other computers to connect\n[-tcpPort <port>]       The port (default\: 9092)\n[-tcpSSL]               Use encrypted (SSL) connections\n[-tcpPassword <pwd>]    The password for shutting down a TCP server\n[-tcpShutdown "<url>"]  Stop the TCP server; example\: tcp\://localhost\:9094\n[-tcpShutdownForce]     Do not wait until all connections are closed\n[-pg]                   Start the PG server\n[-pgAllowOthers]        Allow other computers to connect\n[-pgPort <port>]        The port (default\: 5435)\n[-baseDir <dir>]        The base directory for H2 databases; for all servers\n[-ifExists]             Only existing databases may be opened; for all servers\n[-trace]                Print additional trace information; for all servers
+org.h2.tools.Server.main=When running without options, -tcp, -web, -browser and -pg are started.\nOptions are case sensitive. Supported options are\:\n[-help] or [-?]         Print the list of options\n[-web]                  Start the web server with the H2 Console\n[-webAllowOthers]       Allow other computers to connect - see below\n[-webPort <port>]       The port (default\: 8082)\n[-webSSL]               Use encrypted (HTTPS) connections\n[-browser]              Start a browser and open a page to connect to the web server\n[-tcp]                  Start the TCP server\n[-tcpAllowOthers]       Allow other computers to connect - see below\n[-tcpPort <port>]       The port (default\: 9092)\n[-tcpSSL]               Use encrypted (SSL) connections\n[-tcpPassword <pwd>]    The password for shutting down a TCP server\n[-tcpShutdown "<url>"]  Stop the TCP server; example\: tcp\://localhost\:9094\n[-tcpShutdownForce]     Do not wait until all connections are closed\n[-pg]                   Start the PG server\n[-pgAllowOthers]        Allow other computers to connect - see below\n[-pgPort <port>]        The port (default\: 5435)\n[-baseDir <dir>]        The base directory for H2 databases; for all servers\n[-ifExists]             Only existing databases may be opened; for all servers\n[-trace]                Print additional trace information; for all servers\nThe options -xAllowOthers are potentially risky.\nFor details, see Advanced Topics / Protection against Remote Access.
 org.h2.tools.Shell=Interactive command line tool to access a database using JDBC.
 org.h2.tools.Shell.main=Options are case sensitive. Supported options are\:\n[-help] or [-?]    Print the list of options\n[-url "<url>"]     The database URL (jdbc\:h2\:...)\n[-user <user>]     The user name\n[-password <pwd>]  The password\n[-driver <class>]  The JDBC driver class to use (not required in most cases)\nIf special characters don't work as expected, you may need to use\n -Dfile.encoding\=UTF-8 (Mac OS X) or CP850 (Windows).

h2/src/main/org/h2/store/PageFreeList.java

@@ -69,6 +69,22 @@ public class PageFreeList extends Record {
         }
     }
 
+    int getFirstFree() {
+        if (full) {
+            return -1;
+        }
+        int free = used.nextClearBit(0);
+        if (free >= pageCount) {
+            return -1;
+        }
+        return free;
+    }
+
+    int getLastUsed() {
+        int last = used.getLastSetBit();
+        return last == -1 ? -1 : last + getPos();
+    }
+
     /**
      * Mark a page as used.
      *

h2/src/main/org/h2/store/PageStore.java

@@ -18,6 +18,7 @@ import org.h2.engine.Session;
 import org.h2.index.Cursor;
 import org.h2.index.Index;
 import org.h2.index.IndexType;
+import org.h2.index.Page;
 import org.h2.index.PageBtreeIndex;
 import org.h2.index.PageScanIndex;
 import org.h2.log.InDoubtTransaction;
@@ -71,17 +72,22 @@ import org.h2.value.ValueString;
  */
 public class PageStore implements CacheWriter {
 
-    // TODO var int: see google protocol buffers
-    // TODO don't save parent (only root); remove setPageId
-    // TODO implement checksum - 0 for empty
-    // TODO b-tree index with fixed size values doesn't need offset and so on
+    // TODO shrinking: a way to load pages centrally
+    // TODO shrinking: Page.moveTo(int pageId).
+
+    // TODO utf-x: test if it's faster
+    // TODO value serialization: test (100% coverage)
+
+    // TODO scan index: support long keys, and use var long
+    // TODO don't save the direct parent (only root); remove setPageId
+    // TODO implement checksum; 0 for empty pages
     // TODO remove parent, use tableId if required
     // TODO replace CRC32
     // TODO optimization: try to avoid allocating a byte array per page
+    // TODO optimization: check if calling Data.getValueLen slows things down
     // TODO PageBtreeNode: 4 bytes offset - others use only 2
-    // TODO block compression: don't store the middle zeroes
-    // TODO block compression: maybe http://en.wikipedia.org/wiki/LZJB
-    // with RLE, specially for 0s.
+    // TODO undo pages: don't store the middle zeroes
+    // TODO undo pages compression: try http://en.wikipedia.org/wiki/LZJB
     // TODO order pages so that searching for a key only seeks forward
     // TODO completely re-use keys of deleted rows; maybe
     // remember last page with deleted keys (in the root page?),
@@ -341,13 +347,62 @@ public class PageStore implements CacheWriter {
                     writeCount++;
                 }
             }
-            // TODO shrink file if required here
-            // int pageCount = getFreeList().getLastUsed() + 1;
-            // trace.debug("pageCount:" + pageCount);
-            // file.setLength((long) pageCount << pageSizeShift);
         }
     }
 
+    private void compact() throws SQLException {
+        trim();
+        int full = pageCount - 1;
+        int free = -1;
+        for (int i = 0; i < pageCount && free != -1; i++) {
+            free = getFreeList(i).getFirstFree();
+        }
+        if (free == -1 || free < 10) {
+            return;
+        }
+        Record rec = getRecord(full);
+        if (rec == null) {
+
+        } else {
+            Data page = Data.create(database, pageSize);
+            readPage(full, page);
+            int parent = page.readInt();
+            int type = page.readByte();
+            boolean last = (type & Page.FLAG_LAST) != 0;
+            type = type & ~Page.FLAG_LAST;
+            System.out.println("last page is " + type + " parent: " + parent);
+            switch (type) {
+            case Page.TYPE_EMPTY:
+                break;
+            case Page.TYPE_FREE_LIST:
+                break;
+            case Page.TYPE_DATA_LEAF:
+                break;
+            case Page.TYPE_DATA_NODE:
+            case Page.TYPE_DATA_OVERFLOW:
+            case Page.TYPE_BTREE_LEAF:
+            case Page.TYPE_BTREE_NODE:
+            case Page.TYPE_STREAM_TRUNK:
+            case Page.TYPE_STREAM_DATA:
+            }
+        }
+    }
+
+    /**
+     * Shrink the file so there are no empty pages at the end.
+     */
+    public void trim() throws SQLException {
+        for (int i = getFreeListId(pageCount); i >= 0; i--) {
+            int last = getFreeList(i).getLastUsed();
+            if (last != -1) {
+                pageCount = last + 1;
+                break;
+            }
+        }
+        trace.debug("pageCount:" + pageCount);
+        file.setLength((long) pageCount << pageSizeShift);
+    }
+
     private void switchLog() throws SQLException {
         trace.debug("switchLog");
         Session[] sessions = database.getSessions(true);
@@ -540,8 +595,12 @@ public class PageStore implements CacheWriter {
         }
     }
 
+    private int getFreeListId(int pageId) {
+        return (pageId - PAGE_ID_FREE_LIST_ROOT) / freeListPagesPerList;
+    }
+
     private PageFreeList getFreeListForPage(int pageId) throws SQLException {
-        return getFreeList((pageId - PAGE_ID_FREE_LIST_ROOT) / freeListPagesPerList);
+        return getFreeList(getFreeListId(pageId));
     }
 
     private PageFreeList getFreeList(int i) throws SQLException {

h2/src/main/org/h2/tools/Recover.java

@@ -720,6 +720,7 @@ public class Recover extends Tool implements DataHandler {
         setDatabaseName(fileName.substring(0, fileName.length() - Constants.SUFFIX_PAGE_FILE.length()));
         FileStore store = null;
         PrintWriter writer = null;
+        int[] pageTypeCount = new int[Page.TYPE_STREAM_DATA + 2];
         int emptyPages = 0;
         try {
             writer = getWriter(fileName, ".sql");
@@ -789,6 +790,7 @@ public class Recover extends Tool implements DataHandler {
                 int type = s.readByte();
                 switch (type) {
                 case Page.TYPE_EMPTY:
+                    pageTypeCount[type]++;
                     if (parentPageId != 0) {
                         writer.println("-- ERROR empty page with parent: " + parentPageId);
                     }
@@ -798,29 +800,31 @@ public class Recover extends Tool implements DataHandler {
                 boolean last = (type & Page.FLAG_LAST) != 0;
                 type &= ~Page.FLAG_LAST;
                 switch (type) {
-                case Page.TYPE_DATA_OVERFLOW:
-                    writer.println("-- page " + page + ": data overflow " + (last ? "(last)" : ""));
-                    break;
-                case Page.TYPE_DATA_NODE: {
-                    int entries = s.readShortInt();
-                    int rowCount = s.readInt();
-                    writer.println("-- page " + page + ": data node " + (last ? "(last)" : "") + " entries: " + entries + " rowCount: " + rowCount);
-                    break;
-                }
+                // type 1
                 case Page.TYPE_DATA_LEAF: {
+                    pageTypeCount[type]++;
                     setStorage(s.readInt());
                     int entries = s.readShortInt();
                     writer.println("-- page " + page + ": data leaf " + (last ? "(last)" : "") + " table: " + storageId + " entries: " + entries);
                     dumpPageDataLeaf(store, pageSize, writer, s, last, page, entries);
                     break;
                 }
-                case Page.TYPE_BTREE_NODE:
-                    writer.println("-- page " + page + ": b-tree node" + (last ? "(last)" : ""));
-                    if (trace) {
-                        dumpPageBtreeNode(writer, s, !last);
-                    }
+                // type 2
+                case Page.TYPE_DATA_NODE: {
+                    pageTypeCount[type]++;
+                    int entries = s.readShortInt();
+                    int rowCount = s.readInt();
+                    writer.println("-- page " + page + ": data node " + (last ? "(last)" : "") + " entries: " + entries + " rowCount: " + rowCount);
+                    break;
+                }
+                // type 3
+                case Page.TYPE_DATA_OVERFLOW:
+                    pageTypeCount[type]++;
+                    writer.println("-- page " + page + ": data overflow " + (last ? "(last)" : ""));
                     break;
+                // type 4
                 case Page.TYPE_BTREE_LEAF: {
+                    pageTypeCount[type]++;
                     setStorage(s.readInt());
                     int entries = s.readShortInt();
                     writer.println("-- page " + page + ": b-tree leaf " + (last ? "(last)" : "") + " table: " + storageId + " entries: " + entries);
@@ -829,14 +833,28 @@ public class Recover extends Tool implements DataHandler {
                     }
                     break;
                 }
+                // type 5
+                case Page.TYPE_BTREE_NODE:
+                    pageTypeCount[type]++;
+                    writer.println("-- page " + page + ": b-tree node" + (last ? "(last)" : ""));
+                    if (trace) {
+                        dumpPageBtreeNode(writer, s, !last);
+                    }
+                    break;
+                // type 6
                 case Page.TYPE_FREE_LIST:
+                    pageTypeCount[type]++;
                     writer.println("-- page " + page + ": free list " + (last ? "(last)" : ""));
                     free += dumpPageFreeList(writer, s, pageSize, page, pageCount);
                     break;
+                // type 7
                 case Page.TYPE_STREAM_TRUNK:
+                    pageTypeCount[type]++;
                     writer.println("-- page " + page + ": log trunk");
                     break;
+                // type 8
                 case Page.TYPE_STREAM_DATA:
+                    pageTypeCount[type]++;
                     writer.println("-- page " + page + ": log data");
                     break;
                 default:
@@ -844,13 +862,19 @@ public class Recover extends Tool implements DataHandler {
                     break;
                 }
             }
-            writer.println("-- page count: " + pageCount + " empty: " + emptyPages + " free: " + free);
             writeSchema(writer);
             try {
                 dumpPageLogStream(writer, store, logFirstTrunkPage, logFirstDataPage, pageSize);
             } catch (EOFException e) {
                 // ignore
             }
+            writer.println("-- page count: " + pageCount + " empty: " + emptyPages + " free: " + free);
+            for (int i = 0; i < pageTypeCount.length; i++) {
+                int count = pageTypeCount[i];
+                if (count > 0) {
+                    writer.println("-- page count type: " + i + " " + (100 * count / pageCount) + "% count: " + count);
+                }
+            }
             writer.close();
         } catch (Throwable e) {
             writeError(writer, e);

h2/src/main/org/h2/util/DateTimeUtils.java

@@ -398,4 +398,34 @@ public class DateTimeUtils {
         return value;
     }
 
+    /**
+     * Get the number of milliseconds since 1970-01-01 in the local timezone.
+     *
+     * @param d the date
+     * @return the milliseconds
+     */
+    public static long getTimeLocal(java.util.Date d) {
+        Calendar c = getCalendar();
+        synchronized (c) {
+            c.setTime(d);
+            return c.getTime().getTime() + c.get(Calendar.ZONE_OFFSET);
+        }
+    }
+
+    /**
+     * Convert the number of milliseconds since 1970-01-01 in the local timezone
+     * to GMT.
+     *
+     * @param millis the number of milliseconds in the local timezone
+     * @return the number of milliseconds in GMT
+     */
+    public static long getTimeGMT(long millis) {
+        Date d = new Date(millis);
+        Calendar c = getCalendar();
+        synchronized (c) {
+            c.setTime(d);
+            return c.getTime().getTime() - c.get(Calendar.ZONE_OFFSET);
+        }
+    }
+
 }

h2/src/main/org/h2/value/ValueDecimal.java

@@ -20,6 +20,16 @@ import org.h2.util.MathUtils;
  */
 public class ValueDecimal extends Value {
 
+    /**
+     * The value 'zero'.
+     */
+    public static final Object ZERO = new ValueDecimal(BigDecimal.ZERO);
+
+    /**
+     * The value 'one'.
+     */
+    public static final Object ONE = new ValueDecimal(BigDecimal.ONE);
+
     /**
      * The default precision for a decimal value.
      */
@@ -36,10 +46,6 @@ public class ValueDecimal extends Value {
     static final int DEFAULT_DISPLAY_SIZE = 65535;
 
     private static final int DIVIDE_SCALE_ADD = 25;
-    private static final BigDecimal DEC_ZERO = new BigDecimal("0");
-    private static final BigDecimal DEC_ONE = new BigDecimal("1");
-    private static final Object ZERO = new ValueDecimal(DEC_ZERO);
-    private static final Object ONE = new ValueDecimal(DEC_ONE);
 
     private final BigDecimal value;
     private String valueString;
@@ -82,7 +88,7 @@ public class ValueDecimal extends Value {
         }
         BigDecimal bd = value.divide(dec.value, value.scale() + DIVIDE_SCALE_ADD, BigDecimal.ROUND_HALF_DOWN);
         if (bd.signum() == 0) {
-            bd = DEC_ZERO;
+            bd = BigDecimal.ZERO;
         } else if (bd.scale() > 0) {
             if (!bd.unscaledValue().testBit(0)) {
                 String s = bd.toString();
@@ -185,9 +191,9 @@ public class ValueDecimal extends Value {
      * @return the value
      */
     public static ValueDecimal get(BigDecimal dec) {
-        if (DEC_ZERO.equals(dec)) {
+        if (BigDecimal.ZERO.equals(dec)) {
             return (ValueDecimal) ZERO;
-        } else if (DEC_ONE.equals(dec)) {
+        } else if (BigDecimal.ONE.equals(dec)) {
             return (ValueDecimal) ONE;
         }
         return (ValueDecimal) Value.cache(new ValueDecimal(dec));

h2/src/test/org/h2/test/TestAll.java

@@ -349,6 +349,7 @@ kill -9 `jps -l | grep "org.h2.test." | cut -d " " -f 1`
             test.pageStore = true;
             test.runTests();
             TestPerformance.main("-init", "-db", "1");
+            // Recover.execute("data", null);
 
             System.setProperty(SysProperties.H2_PAGE_STORE, "false");
             test.pageStore = false;

h2/src/test/org/h2/test/unit/TestDataPage.java

@@ -6,10 +6,15 @@
  */
 package org.h2.test.unit;
 
+import java.math.BigDecimal;
+import java.sql.Date;
 import java.sql.SQLException;
+import java.sql.Time;
+import java.sql.Timestamp;
 
 import org.h2.constant.SysProperties;
 import org.h2.message.Trace;
+import org.h2.store.Data;
 import org.h2.store.DataHandler;
 import org.h2.store.DataPage;
 import org.h2.store.FileStore;
@@ -17,11 +22,25 @@ import org.h2.test.TestBase;
 import org.h2.util.SmallLRUCache;
 import org.h2.util.TempFileDeleter;
 import org.h2.value.Value;
+import org.h2.value.ValueArray;
+import org.h2.value.ValueBoolean;
+import org.h2.value.ValueByte;
+import org.h2.value.ValueBytes;
+import org.h2.value.ValueDate;
+import org.h2.value.ValueDecimal;
 import org.h2.value.ValueDouble;
 import org.h2.value.ValueFloat;
 import org.h2.value.ValueInt;
+import org.h2.value.ValueJavaObject;
+import org.h2.value.ValueLong;
 import org.h2.value.ValueNull;
+import org.h2.value.ValueShort;
 import org.h2.value.ValueString;
+import org.h2.value.ValueStringFixed;
+import org.h2.value.ValueStringIgnoreCase;
+import org.h2.value.ValueTime;
+import org.h2.value.ValueTimestamp;
+import org.h2.value.ValueUuid;
 
 /**
  * Data page tests.
@@ -38,9 +57,104 @@ public class TestDataPage extends TestBase implements DataHandler {
     }
 
     public void test() throws SQLException {
+        testValues();
         testAll();
     }
 
+    private void testValues() throws SQLException {
+        testValue(ValueNull.INSTANCE);
+        testValue(ValueBoolean.get(false));
+        testValue(ValueBoolean.get(true));
+        for (int i = 0; i < 256; i++) {
+            testValue(ValueByte.get((byte) i));
+        }
+        for (int i = 0; i < 256 * 256; i += 10) {
+            testValue(ValueShort.get((short) i));
+        }
+        for (int i = 0; i < 256 * 256; i += 10) {
+            testValue(ValueInt.get(i));
+            testValue(ValueInt.get(-i));
+            testValue(ValueLong.get(i));
+            testValue(ValueLong.get(-i));
+        }
+        testValue(ValueInt.get(Integer.MAX_VALUE));
+        testValue(ValueInt.get(Integer.MIN_VALUE));
+        for (long i = 0; i < Integer.MAX_VALUE; i += 10 + i / 4) {
+            testValue(ValueInt.get((int) i));
+            testValue(ValueInt.get((int) -i));
+        }
+        testValue(ValueLong.get(Long.MAX_VALUE));
+        testValue(ValueLong.get(Long.MIN_VALUE));
+        for (long i = 0; i >= 0; i += 10 + i / 4) {
+            testValue(ValueLong.get(i));
+            testValue(ValueLong.get(-i));
+        }
+        testValue(ValueDecimal.get(BigDecimal.ZERO));
+        testValue(ValueDecimal.get(BigDecimal.ONE));
+        testValue(ValueDecimal.get(BigDecimal.TEN));
+        testValue(ValueDecimal.get(BigDecimal.ONE.negate()));
+        testValue(ValueDecimal.get(BigDecimal.TEN.negate()));
+        for (long i = 0; i >= 0; i += 10 + i / 4) {
+            testValue(ValueDecimal.get(new BigDecimal(i)));
+            testValue(ValueDecimal.get(new BigDecimal(-i)));
+            for (int j = 0; j < 200; j += 50) {
+                testValue(ValueDecimal.get(new BigDecimal(i).setScale(j)));
+                testValue(ValueDecimal.get(new BigDecimal(i * i).setScale(j)));
+            }
+            testValue(ValueDecimal.get(new BigDecimal(i * i)));
+        }
+        testValue(ValueDate.get(new Date(System.currentTimeMillis())));
+        testValue(ValueDate.get(new Date(0)));
+        testValue(ValueTime.get(new Time(System.currentTimeMillis())));
+        testValue(ValueTime.get(new Time(0)));
+        testValue(ValueTimestamp.get(new Timestamp(System.currentTimeMillis())));
+        testValue(ValueTimestamp.get(new Timestamp(0)));
+        testValue(ValueJavaObject.getNoCopy(new byte[0]));
+        testValue(ValueJavaObject.getNoCopy(new byte[100]));
+        for (int i = 0; i < 300; i++) {
+            testValue(ValueBytes.getNoCopy(new byte[i]));
+        }
+        for (int i = 0; i < 65000; i += 10 + i) {
+            testValue(ValueBytes.getNoCopy(new byte[i]));
+        }
+        testValue(ValueUuid.getNewRandom());
+        for (int i = 0; i < 100; i++) {
+            testValue(ValueString.get(new String(new char[i])));
+        }
+        for (int i = 0; i < 65000; i += 10 + i) {
+            testValue(ValueString.get(new String(new char[i])));
+            testValue(ValueStringFixed.get(new String(new char[i])));
+            testValue(ValueStringIgnoreCase.get(new String(new char[i])));
+        }
+        testValue(ValueFloat.get(0f));
+        testValue(ValueFloat.get(1f));
+        testValue(ValueFloat.get(-1f));
+        testValue(ValueDouble.get(0));
+        testValue(ValueDouble.get(1));
+        testValue(ValueDouble.get(-1));
+        for (int i = 0; i < 65000; i += 10 + i) {
+            for (double j = 0.1; j < 65000; j += 10 + j) {
+                testValue(ValueFloat.get((float) (i / j)));
+                testValue(ValueDouble.get(i / j));
+                testValue(ValueFloat.get((float) -(i / j)));
+                testValue(ValueDouble.get(-(i / j)));
+            }
+        }
+        testValue(ValueArray.get(new Value[0]));
+        testValue(ValueArray.get(new Value[] {ValueBoolean.get(true), ValueInt.get(10)}));
+    }
+
+    private void testValue(Value v) throws SQLException {
+        Data data = Data.create(null, 1024);
+        data.checkCapacity((int) v.getPrecision());
+        data.writeValue(v);
+        data.reset();
+        Value v2 = data.readValue();
+        assertEquals(v.getType(), v2.getType());
+        assertTrue(v.compareEqual(v2));
+    }
+
+
     private void testAll() throws SQLException {
         DataPage page = DataPage.create(this, 128);