Opening an closing a database is now faster.

h2/src/main/org/h2/engine/ConnectionInfo.java

@@ -37,6 +37,7 @@ public class ConnectionInfo implements Cloneable {
      * The database name
      */
     private String name;
+    private String nameNormalized;
     private boolean remote;
     private boolean ssl;
     private boolean persistent;
@@ -331,14 +332,16 @@ public class ConnectionInfo implements Cloneable {
      */
     String getName() {
         if (persistent) {
-            String suffix = Constants.SUFFIX_PAGE_FILE;
-            String n = IOUtils.normalize(name + suffix);
-            String fileName = IOUtils.getFileName(n);
-            if (fileName.length() < suffix.length() + 1) {
-                throw DbException.get(ErrorCode.INVALID_DATABASE_NAME_1, name);
+            if (nameNormalized == null) {
+                String suffix = Constants.SUFFIX_PAGE_FILE;
+                String n = IOUtils.normalize(name + suffix);
+                String fileName = IOUtils.getFileName(n);
+                if (fileName.length() < suffix.length() + 1) {
+                    throw DbException.get(ErrorCode.INVALID_DATABASE_NAME_1, name);
+                }
+                nameNormalized = n.substring(0, n.length() - suffix.length());
             }
-            n = n.substring(0, n.length() - suffix.length());
-            return IOUtils.normalize(n);
+            return nameNormalized;
         }
         return name;
     }

h2/src/main/org/h2/engine/Database.java

@@ -535,7 +535,6 @@ public class Database implements DataHandler {
             starting = true;
             getPageStore();
             starting = false;
-            reserveLobFileObjectIds();
             writer = WriterThread.create(this, writeDelay);
         } else {
             traceSystem = new TraceSystem(null);
@@ -1431,30 +1430,11 @@ public class Database implements DataHandler {
         }
     }
 
-    private void reserveLobFileObjectIds() {
-        String prefix = IOUtils.normalize(databaseName) + ".";
-        String path = IOUtils.getParent(databaseName);
-        String[] list = IOUtils.listFiles(path);
-        for (String name : list) {
-            if (name.endsWith(Constants.SUFFIX_LOB_FILE) && IOUtils.fileStartsWith(name, prefix)) {
-                name = name.substring(prefix.length());
-                name = name.substring(0, name.length() - Constants.SUFFIX_LOB_FILE.length());
-                int dot = name.indexOf('.');
-                if (dot >= 0) {
-                    String id = name.substring(dot + 1);
-                    int objectId = Integer.parseInt(id);
-                    objectIds.set(objectId);
-                }
-            }
-        }
-    }
-
     private void deleteOldTempFiles() {
         String path = IOUtils.getParent(databaseName);
-        String prefix = IOUtils.normalize(databaseName);
         String[] list = IOUtils.listFiles(path);
         for (String name : list) {
-            if (name.endsWith(Constants.SUFFIX_TEMP_FILE) && IOUtils.fileStartsWith(name, prefix)) {
+            if (name.endsWith(Constants.SUFFIX_TEMP_FILE) && IOUtils.fileStartsWith(name, databaseName)) {
                 // can't always delete the files, they may still be open
                 IOUtils.tryDelete(name);
             }

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

@@ -78,16 +78,20 @@ public class FileStore {
             tempFileDeleter = handler.getTempFileDeleter();
         }
         try {
-            fs.createDirs(name);
-            if (fs.exists(name) && !fs.canWrite(name)) {
+            boolean exists = fs.exists(name);
+            if (exists && !fs.canWrite(name)) {
                 mode = "r";
                 this.mode = mode;
+            } else {
+                fs.createDirs(name);
             }
             file = fs.openFileObject(name, mode);
             if (mode.length() > 2) {
                 synchronousMode = true;
             }
-            fileLength = file.length();
+            if (exists) {
+                fileLength = file.length();
+            }
         } catch (IOException e) {
             throw DbException.convertIOException(e, "name: " + name + " mode: " + mode);
         }

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

@@ -188,7 +188,12 @@ public class PageLog {
      * Free up all pages allocated by the log.
      */
     void free() {
+        if (trace.isDebugEnabled()) {
+            trace.debug("log free");
+        }
+        int currentDataPage = 0;
         if (pageOut != null) {
+            currentDataPage = pageOut.getCurrentDataPageId();
             pageOut.freeReserved();
         }
         PageStreamTrunk.Iterator it = new PageStreamTrunk.Iterator(store, firstTrunkPage);
@@ -200,7 +205,7 @@ public class PageLog {
                 }
                 break;
             }
-            t.free();
+            t.free(currentDataPage);
             firstTrunkPage = t.getNextTrunk();
         }
     }

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

@@ -191,7 +191,7 @@ public class PageOutputStream {
      * @param t the trunk page
      */
     void free(PageStreamTrunk t) {
-        pageCount -= t.free();
+        pageCount -= t.free(0);
     }
 
     /**

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

@@ -402,6 +402,9 @@ public class PageStore implements CacheWriter {
             // ensure the free list is backed up again
             log.checkpoint();
 
+            if (trace.isDebugEnabled()) {
+                trace.debug("writeFree");
+            }
             byte[] test = new byte[16];
             byte[] empty = new byte[pageSize];
             for (int i = PAGE_ID_FREE_LIST_ROOT; i < pageCount; i++) {
@@ -444,13 +447,12 @@ public class PageStore implements CacheWriter {
         // open a new log at the very end
         // (to be truncated later)
         writeBack();
+        log.free();
         recoveryRunning = true;
         try {
-            log.free();
             logFirstTrunkPage = lastUsed + 1;
             allocatePage(logFirstTrunkPage);
             log.openForWriting(logFirstTrunkPage, true);
-
             // ensure the free list is backed up again
             log.checkpoint();
         } finally {
@@ -465,12 +467,6 @@ public class PageStore implements CacheWriter {
         }
         int blockSize = fully ? COMPACT_BLOCK_SIZE : 1;
         for (int x = lastUsed, j = 0; x > MIN_PAGE_COUNT && j < maxMove; x -= blockSize) {
-            for (int full = x - blockSize + 1; full <= x; full++) {
-                if (full > MIN_PAGE_COUNT) {
-                    // ensure the page is in the disk buffer
-                    readPage(full);
-                }
-            }
             for (int full = x - blockSize + 1; full <= x; full++) {
                 if (full > MIN_PAGE_COUNT) {
                     synchronized (database) {
@@ -501,10 +497,10 @@ public class PageStore implements CacheWriter {
         writeBack();
         log.checkpoint();
 
+        log.free();
         // truncate the log
         recoveryRunning = true;
         try {
-            log.free();
             setLogFirstPage(0, 0, 0);
         } finally {
             recoveryRunning = false;
@@ -1061,7 +1057,7 @@ public class PageStore implements CacheWriter {
      */
     void free(int pageId, boolean undo) {
         if (trace.isDebugEnabled()) {
-            // trace.debug("freePage " + pageId);
+            // trace.debug("free " + pageId + " " + undo);
         }
         synchronized (database) {
             cache.remove(pageId);
@@ -1085,6 +1081,22 @@ public class PageStore implements CacheWriter {
         }
     }
 
+    /**
+     * Add a page to the free list. The page is not used, therefore doesn't need to be overwritten.
+     *
+     * @param pageId the page id
+     */
+    void freeUnused(int pageId) {
+        if (trace.isDebugEnabled()) {
+            trace.debug("freeUnused " + pageId);
+        }
+        synchronized (database) {
+            cache.remove(pageId);
+            freePage(pageId);
+            freed.set(pageId);
+        }
+    }
+
     /**
      * Create a data object.
      *

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

@@ -158,17 +158,28 @@ public class PageStreamTrunk extends Page {
     }
 
     /**
-     * Free this page and all data pages.
+     * Free this page and all data pages. Pages after the last used data page
+     * (if within this list) are empty and therefore not just freed, but marked
+     * as not used.
      *
+     * @param lastUsedPage the last used data page
      * @return the number of pages freed
      */
-    int free() {
+    int free(int lastUsedPage) {
         store.free(getPos(), false);
         int freed = 1;
+        boolean notUsed = false;
         for (int i = 0; i < pageCount; i++) {
             int page = pageIds[i];
-            store.free(page, false);
+            if (notUsed) {
+                store.freeUnused(page);
+            } else {
+                store.free(page, false);
+            }
             freed++;
+            if (page == lastUsedPage) {
+                notUsed = true;
+            }
         }
         return freed;
     }