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Example 16 with FileCommitLogManager

use of herddb.file.FileCommitLogManager in project herddb by diennea.

the class FileDataStorageManagerRestartTest method recoverTableAndIndexWithoutHash.

@Test
public void recoverTableAndIndexWithoutHash() throws Exception {
    Path dataPath = folder.newFolder("data").toPath();
    Path logsPath = folder.newFolder("logs").toPath();
    Path metadataPath = folder.newFolder("metadata").toPath();
    Path tmpDir = folder.newFolder("tmpDir").toPath();
    String nodeId = "localhost";
    Table table;
    Index index;
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath, dataPath.resolve("tmp"), ServerConfiguration.PROPERTY_DISK_SWAP_MAX_RECORDS_DEFAULT, ServerConfiguration.PROPERTY_REQUIRE_FSYNC_DEFAULT, ServerConfiguration.PROPERTY_PAGE_USE_ODIRECT_DEFAULT, ServerConfiguration.PROPERTY_INDEX_USE_ODIRECT_DEFAULT, false, false, new NullStatsLogger()), new FileCommitLogManager(logsPath), tmpDir, null)) {
        manager.start();
        CreateTableSpaceStatement st1 = new CreateTableSpaceStatement("tblspace1", Collections.singleton(nodeId), nodeId, 1, 0, 0);
        manager.executeStatement(st1, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        assertTrue(manager.waitForTablespace("tblspace1", 10000));
        table = Table.builder().tablespace("tblspace1").name("t1").column("id", ColumnTypes.INTEGER).column("name", ColumnTypes.STRING).primaryKey("id").build();
        index = Index.builder().onTable(table).column("name", ColumnTypes.STRING).type(Index.TYPE_BRIN).build();
        manager.executeStatement(new CreateTableStatement(table), StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.executeStatement(new CreateIndexStatement(index), StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.executeStatement(new InsertStatement("tblspace1", table.name, RecordSerializer.makeRecord(table, "id", 1, "name", "uno")), StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        GetResult result = manager.get(new GetStatement("tblspace1", table.name, Bytes.from_int(1), null, false), StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        assertTrue(result.found());
        /*
             * Access through index
             */
        TranslatedQuery translated = manager.getPlanner().translate(TableSpace.DEFAULT, "SELECT * FROM tblspace1.t1", Collections.emptyList(), true, true, false, -1);
        ScanStatement scan = translated.plan.mainStatement.unwrap(ScanStatement.class);
        try (DataScanner scan1 = manager.scan(scan, translated.context, TransactionContext.NO_TRANSACTION)) {
            assertEquals(1, scan1.consume().size());
        }
        manager.checkpoint();
    }
    // Enabling hash-chacking: previous stored hashes (value 0) has not to fail the check.
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath, dataPath.resolve("tmp"), ServerConfiguration.PROPERTY_DISK_SWAP_MAX_RECORDS_DEFAULT, ServerConfiguration.PROPERTY_REQUIRE_FSYNC_DEFAULT, ServerConfiguration.PROPERTY_PAGE_USE_ODIRECT_DEFAULT, ServerConfiguration.PROPERTY_INDEX_USE_ODIRECT_DEFAULT, true, true, new NullStatsLogger()), new FileCommitLogManager(logsPath), tmpDir, null)) {
        manager.start();
        assertTrue(manager.waitForBootOfLocalTablespaces(10000));
        /*
             * Access through index
             */
        TranslatedQuery translated = manager.getPlanner().translate(TableSpace.DEFAULT, "SELECT * FROM tblspace1.t1", Collections.emptyList(), true, true, false, -1);
        ScanStatement scan = translated.plan.mainStatement.unwrap(ScanStatement.class);
        try (DataScanner scan1 = manager.scan(scan, translated.context, TransactionContext.NO_TRANSACTION)) {
            assertEquals(1, scan1.consume().size());
        }
    }
}
Also used : Path(java.nio.file.Path) Table(herddb.model.Table) TranslatedQuery(herddb.sql.TranslatedQuery) GetResult(herddb.model.GetResult) FileMetadataStorageManager(herddb.file.FileMetadataStorageManager) CreateTableStatement(herddb.model.commands.CreateTableStatement) CreateIndexStatement(herddb.model.commands.CreateIndexStatement) Index(herddb.model.Index) InsertStatement(herddb.model.commands.InsertStatement) FileCommitLogManager(herddb.file.FileCommitLogManager) CreateTableSpaceStatement(herddb.model.commands.CreateTableSpaceStatement) DataScanner(herddb.model.DataScanner) NullStatsLogger(org.apache.bookkeeper.stats.NullStatsLogger) GetStatement(herddb.model.commands.GetStatement) FileDataStorageManager(herddb.file.FileDataStorageManager) ScanStatement(herddb.model.commands.ScanStatement) Test(org.junit.Test)

Example 17 with FileCommitLogManager

use of herddb.file.FileCommitLogManager in project herddb by diennea.

the class SimpleIHashIndexRecoveryTest method createRecoveryIndex_withcheckpoint.

@Test
public void createRecoveryIndex_withcheckpoint() throws Exception {
    Path dataPath = folder.newFolder("data").toPath();
    Path logsPath = folder.newFolder("logs").toPath();
    Path metadataPath = folder.newFolder("metadata").toPath();
    Path tmoDir = folder.newFolder("tmoDir").toPath();
    String nodeId = "localhost";
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath), new FileCommitLogManager(logsPath), tmoDir, null)) {
        manager.start();
        CreateTableSpaceStatement st1 = new CreateTableSpaceStatement("tblspace1", Collections.singleton(nodeId), nodeId, 1, 0, 0);
        manager.executeStatement(st1, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.waitForTablespace("tblspace1", 10000);
        Table table = Table.builder().tablespace("tblspace1").name("t1").column("id", ColumnTypes.STRING).column("name", ColumnTypes.STRING).primaryKey("id").build();
        CreateTableStatement st2 = new CreateTableStatement(table);
        manager.executeStatement(st2, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        Index index = Index.builder().onTable(table).type(Index.TYPE_HASH).column("name", ColumnTypes.STRING).build();
        TestUtils.executeUpdate(manager, "INSERT INTO tblspace1.t1(id,name) values('a','n1')", Collections.emptyList());
        TestUtils.executeUpdate(manager, "INSERT INTO tblspace1.t1(id,name) values('b','n1')", Collections.emptyList());
        TestUtils.executeUpdate(manager, "INSERT INTO tblspace1.t1(id,name) values('c','n1')", Collections.emptyList());
        TestUtils.executeUpdate(manager, "INSERT INTO tblspace1.t1(id,name) values('d','n2')", Collections.emptyList());
        TestUtils.executeUpdate(manager, "INSERT INTO tblspace1.t1(id,name) values('e','n2')", Collections.emptyList());
        CreateIndexStatement st3 = new CreateIndexStatement(index);
        manager.executeStatement(st3, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        TranslatedQuery translated = manager.getPlanner().translate(TableSpace.DEFAULT, "SELECT * FROM tblspace1.t1 WHERE name='n1'", Collections.emptyList(), true, true, false, -1);
        ScanStatement scan = translated.plan.mainStatement.unwrap(ScanStatement.class);
        assertTrue(scan.getPredicate().getIndexOperation() instanceof SecondaryIndexSeek);
        try (DataScanner scan1 = manager.scan(scan, translated.context, TransactionContext.NO_TRANSACTION)) {
            assertEquals(3, scan1.consume().size());
        }
        manager.checkpoint();
    }
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath), new FileCommitLogManager(logsPath), tmoDir, null)) {
        manager.start();
        assertTrue(manager.waitForTablespace("tblspace1", 10000));
        TranslatedQuery translated = manager.getPlanner().translate(TableSpace.DEFAULT, "SELECT * FROM tblspace1.t1 WHERE name='n1'", Collections.emptyList(), true, true, false, -1);
        ScanStatement scan = translated.plan.mainStatement.unwrap(ScanStatement.class);
        assertTrue(scan.getPredicate().getIndexOperation() instanceof SecondaryIndexSeek);
        try (DataScanner scan1 = manager.scan(scan, translated.context, TransactionContext.NO_TRANSACTION)) {
            assertEquals(3, scan1.consume().size());
        }
    }
}
Also used : Path(java.nio.file.Path) Table(herddb.model.Table) TranslatedQuery(herddb.sql.TranslatedQuery) FileMetadataStorageManager(herddb.file.FileMetadataStorageManager) CreateTableStatement(herddb.model.commands.CreateTableStatement) CreateIndexStatement(herddb.model.commands.CreateIndexStatement) Index(herddb.model.Index) FileCommitLogManager(herddb.file.FileCommitLogManager) CreateTableSpaceStatement(herddb.model.commands.CreateTableSpaceStatement) SecondaryIndexSeek(herddb.index.SecondaryIndexSeek) DataScanner(herddb.model.DataScanner) FileDataStorageManager(herddb.file.FileDataStorageManager) ScanStatement(herddb.model.commands.ScanStatement) Test(org.junit.Test)

Example 18 with FileCommitLogManager

use of herddb.file.FileCommitLogManager in project herddb by diennea.

the class SimpleRecoveryTest method rollbackDeleteTransactionOnRestart.

@Test
public void rollbackDeleteTransactionOnRestart() throws Exception {
    Path dataPath = folder.newFolder("data").toPath();
    Path logsPath = folder.newFolder("logs").toPath();
    Path metadataPath = folder.newFolder("metadata").toPath();
    Bytes key = Bytes.from_int(1234);
    Bytes value = Bytes.from_long(8888);
    Path tmoDir = folder.newFolder("tmoDir").toPath();
    String nodeId = "localhost";
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath), new FileCommitLogManager(logsPath), tmoDir, null)) {
        manager.start();
        CreateTableSpaceStatement st1 = new CreateTableSpaceStatement("tblspace1", Collections.singleton(nodeId), nodeId, 1, 0, 0);
        manager.executeStatement(st1, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.waitForTablespace("tblspace1", 10000);
        Table table = Table.builder().tablespace("tblspace1").name("t1").column("id", ColumnTypes.STRING).column("name", ColumnTypes.STRING).primaryKey("id").build();
        CreateTableStatement st2 = new CreateTableStatement(table);
        manager.executeStatement(st2, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.checkpoint();
        InsertStatement insert = new InsertStatement("tblspace1", "t1", new Record(key, value));
        assertEquals(1, manager.executeUpdate(insert, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION).getUpdateCount());
        // transaction is not committed, and the leader dies, key appear again
        long tx = ((TransactionResult) manager.executeStatement(new BeginTransactionStatement("tblspace1"), StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION)).getTransactionId();
        DeleteStatement delete = new DeleteStatement("tblspace1", "t1", key, null);
        assertEquals(1, manager.executeUpdate(delete, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), new TransactionContext(tx)).getUpdateCount());
    }
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath), new FileCommitLogManager(logsPath), tmoDir, null)) {
        manager.start();
        manager.waitForTablespace("tblspace1", 10000);
        {
            GetStatement get = new GetStatement("tblspace1", "t1", key, null, false);
            GetResult result = manager.get(get, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
            assertTrue(result.found());
            assertEquals(key, result.getRecord().key);
            assertEquals(value, result.getRecord().value);
        }
    }
}
Also used : Path(java.nio.file.Path) TransactionResult(herddb.model.TransactionResult) Table(herddb.model.Table) GetResult(herddb.model.GetResult) FileMetadataStorageManager(herddb.file.FileMetadataStorageManager) CreateTableStatement(herddb.model.commands.CreateTableStatement) DeleteStatement(herddb.model.commands.DeleteStatement) InsertStatement(herddb.model.commands.InsertStatement) Bytes(herddb.utils.Bytes) FileCommitLogManager(herddb.file.FileCommitLogManager) CreateTableSpaceStatement(herddb.model.commands.CreateTableSpaceStatement) TransactionContext(herddb.model.TransactionContext) GetStatement(herddb.model.commands.GetStatement) FileDataStorageManager(herddb.file.FileDataStorageManager) BeginTransactionStatement(herddb.model.commands.BeginTransactionStatement) Record(herddb.model.Record) Test(org.junit.Test)

Example 19 with FileCommitLogManager

use of herddb.file.FileCommitLogManager in project herddb by diennea.

the class SimpleRecoveryTest method rollbackInsertTransactionOnRestart.

@Test
public void rollbackInsertTransactionOnRestart() throws Exception {
    Path dataPath = folder.newFolder("data").toPath();
    Path logsPath = folder.newFolder("logs").toPath();
    Path metadataPath = folder.newFolder("metadata").toPath();
    Bytes key = Bytes.from_int(1234);
    Bytes key2 = Bytes.from_int(1235);
    Bytes value = Bytes.from_long(8888);
    Path tmoDir = folder.newFolder("tmoDir").toPath();
    String nodeId = "localhost";
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath), new FileCommitLogManager(logsPath), tmoDir, null)) {
        manager.start();
        CreateTableSpaceStatement st1 = new CreateTableSpaceStatement("tblspace1", Collections.singleton(nodeId), nodeId, 1, 0, 0);
        manager.executeStatement(st1, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.waitForTablespace("tblspace1", 10000);
        Table table = Table.builder().tablespace("tblspace1").name("t1").column("id", ColumnTypes.STRING).column("name", ColumnTypes.STRING).primaryKey("id").build();
        CreateTableStatement st2 = new CreateTableStatement(table);
        manager.executeStatement(st2, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.checkpoint();
        long tx = ((TransactionResult) manager.executeStatement(new BeginTransactionStatement("tblspace1"), StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION)).getTransactionId();
        InsertStatement insert = new InsertStatement("tblspace1", "t1", new Record(key, value));
        assertEquals(1, manager.executeUpdate(insert, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), new TransactionContext(tx)).getUpdateCount());
        // transaction is not committed, and the leader dies, key MUST not appear anymore
        InsertStatement insert2 = new InsertStatement("tblspace1", "t1", new Record(key2, value));
        assertEquals(1, manager.executeUpdate(insert2, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION).getUpdateCount());
    }
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath), new FileCommitLogManager(logsPath), tmoDir, null)) {
        manager.start();
        manager.waitForTablespace("tblspace1", 10000);
        {
            GetStatement get = new GetStatement("tblspace1", "t1", key2, null, false);
            GetResult result = manager.get(get, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
            assertTrue(result.found());
            assertEquals(key2, result.getRecord().key);
            assertEquals(value, result.getRecord().value);
        }
        {
            // transaction rollback occurred
            GetStatement get = new GetStatement("tblspace1", "t1", key, null, false);
            GetResult result = manager.get(get, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
            assertFalse(result.found());
        }
    }
}
Also used : Path(java.nio.file.Path) TransactionResult(herddb.model.TransactionResult) Table(herddb.model.Table) GetResult(herddb.model.GetResult) FileMetadataStorageManager(herddb.file.FileMetadataStorageManager) CreateTableStatement(herddb.model.commands.CreateTableStatement) InsertStatement(herddb.model.commands.InsertStatement) Bytes(herddb.utils.Bytes) FileCommitLogManager(herddb.file.FileCommitLogManager) CreateTableSpaceStatement(herddb.model.commands.CreateTableSpaceStatement) TransactionContext(herddb.model.TransactionContext) GetStatement(herddb.model.commands.GetStatement) FileDataStorageManager(herddb.file.FileDataStorageManager) BeginTransactionStatement(herddb.model.commands.BeginTransactionStatement) Record(herddb.model.Record) Test(org.junit.Test)

Example 20 with FileCommitLogManager

use of herddb.file.FileCommitLogManager in project herddb by diennea.

the class SimpleRecoveryTest method createInsertDeleteSameTransactionAndRestart.

@Test
public void createInsertDeleteSameTransactionAndRestart() throws Exception {
    Path dataPath = folder.newFolder("data").toPath();
    Path logsPath = folder.newFolder("logs").toPath();
    Path metadataPath = folder.newFolder("metadata").toPath();
    Bytes key = Bytes.from_int(1234);
    Bytes key2 = Bytes.from_int(1235);
    Bytes value = Bytes.from_long(8888);
    Path tmoDir = folder.newFolder("tmoDir").toPath();
    String nodeId = "localhost";
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath), new FileCommitLogManager(logsPath), tmoDir, null)) {
        manager.start();
        CreateTableSpaceStatement st1 = new CreateTableSpaceStatement("tblspace1", Collections.singleton(nodeId), nodeId, 1, 0, 0);
        manager.executeStatement(st1, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.waitForTablespace("tblspace1", 10000);
        Table table = Table.builder().tablespace("tblspace1").name("t1").column("id", ColumnTypes.STRING).column("name", ColumnTypes.STRING).primaryKey("id").build();
        CreateTableStatement st2 = new CreateTableStatement(table);
        manager.executeStatement(st2, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
        manager.checkpoint();
        long tx = ((TransactionResult) manager.executeStatement(new BeginTransactionStatement("tblspace1"), StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION)).getTransactionId();
        InsertStatement insert = new InsertStatement("tblspace1", "t1", new Record(key, value));
        assertEquals(1, manager.executeUpdate(insert, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), new TransactionContext(tx)).getUpdateCount());
        DeleteStatement delete = new DeleteStatement("tblspace1", "t1", key, null);
        assertEquals(1, manager.executeUpdate(delete, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), new TransactionContext(tx)).getUpdateCount());
        InsertStatement insert2 = new InsertStatement("tblspace1", "t1", new Record(key2, value));
        assertEquals(1, manager.executeUpdate(insert2, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), new TransactionContext(tx)).getUpdateCount());
        manager.executeStatement(new CommitTransactionStatement("tblspace1", tx), StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
    }
    try (DBManager manager = new DBManager("localhost", new FileMetadataStorageManager(metadataPath), new FileDataStorageManager(dataPath), new FileCommitLogManager(logsPath), tmoDir, null)) {
        manager.start();
        manager.waitForTablespace("tblspace1", 10000);
        {
            GetStatement get = new GetStatement("tblspace1", "t1", key, null, false);
            GetResult result = manager.get(get, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
            assertFalse(result.found());
        }
        {
            GetStatement get = new GetStatement("tblspace1", "t1", key2, null, false);
            GetResult result = manager.get(get, StatementEvaluationContext.DEFAULT_EVALUATION_CONTEXT(), TransactionContext.NO_TRANSACTION);
            assertTrue(result.found());
            assertEquals(key2, result.getRecord().key);
            assertEquals(value, result.getRecord().value);
        }
    }
}
Also used : Path(java.nio.file.Path) TransactionResult(herddb.model.TransactionResult) Table(herddb.model.Table) GetResult(herddb.model.GetResult) CommitTransactionStatement(herddb.model.commands.CommitTransactionStatement) FileMetadataStorageManager(herddb.file.FileMetadataStorageManager) CreateTableStatement(herddb.model.commands.CreateTableStatement) DeleteStatement(herddb.model.commands.DeleteStatement) InsertStatement(herddb.model.commands.InsertStatement) Bytes(herddb.utils.Bytes) FileCommitLogManager(herddb.file.FileCommitLogManager) CreateTableSpaceStatement(herddb.model.commands.CreateTableSpaceStatement) TransactionContext(herddb.model.TransactionContext) GetStatement(herddb.model.commands.GetStatement) FileDataStorageManager(herddb.file.FileDataStorageManager) BeginTransactionStatement(herddb.model.commands.BeginTransactionStatement) Record(herddb.model.Record) Test(org.junit.Test)

Aggregations

FileCommitLogManager (herddb.file.FileCommitLogManager)48 Path (java.nio.file.Path)48 FileDataStorageManager (herddb.file.FileDataStorageManager)47 FileMetadataStorageManager (herddb.file.FileMetadataStorageManager)47 Test (org.junit.Test)44 CreateTableSpaceStatement (herddb.model.commands.CreateTableSpaceStatement)42 Table (herddb.model.Table)39 CreateTableStatement (herddb.model.commands.CreateTableStatement)38 GetStatement (herddb.model.commands.GetStatement)30 GetResult (herddb.model.GetResult)29 InsertStatement (herddb.model.commands.InsertStatement)27 Bytes (herddb.utils.Bytes)21 Record (herddb.model.Record)20 TransactionContext (herddb.model.TransactionContext)20 DataScanner (herddb.model.DataScanner)18 TransactionResult (herddb.model.TransactionResult)17 BeginTransactionStatement (herddb.model.commands.BeginTransactionStatement)16 TranslatedQuery (herddb.sql.TranslatedQuery)13 Index (herddb.model.Index)12 CommitTransactionStatement (herddb.model.commands.CommitTransactionStatement)12