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提交 fa002664 authored 作者: Thomas Mueller's avatar Thomas Mueller
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h2/src/docsrc/html/features.html
浏览文件 @ fa002664
......@@ -767,7 +767,6 @@ must be escaped, as in the example below.
String url = "jdbc:h2:mem;INIT=RUNSCRIPT FROM '~/create.sql'\\;RUNSCRIPT FROM '~/populate.sql'";
</pre>
<h2 id="ignore_unknown_settings">Ignore Unknown Settings</h2>
<p>
Some applications (for example OpenOffice.org Base) pass some additional parameters
......
h2/src/docsrc/html/roadmap.html
浏览文件 @ fa002664
......@@ -22,163 +22,154 @@ Of course, patches are always welcome, but are not always applied as is.
See also <a href="build.html#providing_patches">Providing Patches</a>.
</p>
<h2>Version 1.2</h2>
<ul><li>Enable the system property h2.optimizeInList by default.
</li><li>Enable the system property h2.nullConcatIsNull by default.
</li><li>Enable the system property h2.pageStore by default.
</li></ul>
<h2>Priority 1</h2>
<ul>
<li>Bugfixes
</li><li>Issues 161, 157: Support large inserts and updates (use the transaction log for rollback).
Problems: Session.commit (rows), cache, undoLog.
<ul><li>Bugfixes
</li><li>Use the transaction log for rollback.
</li><li>More tests with MULTI_THREADED=1
</li><li>Optimization: result set caching (like MySQL); option to disable
</li><li>Server side cursors
</li></ul>
<h2>Priority 2</h2>
<ul>
<li>Improve test code coverage
<ul><li>Improve test code coverage
</li><li>Test multi-threaded in-memory db access
</li><li>MVCC: select for update should only lock the selected rows.
</li><li>Option to shutdown all the running servers (on the same VM).
</li><li>Full outer joins
</li><li>Support mixed clustering mode (one embedded, others in server mode)
</li><li>Full outer joins.
</li><li>Support mixed clustering mode (one embedded, others in server mode).
</li><li>PostgreSQL catalog: use BEFORE SELECT triggers instead of views over metadata tables.
</li><li>Test very large databases and LOBs (up to 256 GB)
</li><li>Test very large databases and LOBs (up to 256 GB).
</li><li>Support hints for the optimizer (which index to use, enforce the join order).
</li><li>Change LOB mechanism (less files, keep index of lob files, point to files and row, delete unused files earlier, maybe bundle files into a tar file)
</li><li>Change LOB mechanism (less files, keep index of lob files, point to files and row, delete unused files earlier, maybe bundle files into a tar file).
</li><li>Clustering: recovery needs to becomes fully automatic. Global write lock feature.
</li><li>Clustering: reads should be randomly distributed (optional) or to a designated database on RAM (parameter: READ_FROM=3)
</li><li>Sequence: add features [NO] MINVALUE, MAXVALUE, CYCLE
</li><li>Deferred integrity checking (DEFERRABLE INITIALLY DEFERRED)
</li><li>Groovy Stored Procedures (http://groovy.codehaus.org/Groovy+SQL)
</li><li>Add a migration guide (list differences between databases)
</li><li>Migrate database tool (also from other database engines)
</li><li>Clustering: reads should be randomly distributed (optional) or to a designated database on RAM (parameter: READ_FROM=3).
</li><li>Sequence: add features [NO] MINVALUE, MAXVALUE, CYCLE.
</li><li>Deferred integrity checking (DEFERRABLE INITIALLY DEFERRED).
</li><li>Groovy Stored Procedures: http://groovy.codehaus.org/Groovy+SQL
</li><li>Add a migration guide (list differences between databases).
</li><li>Migrate database tool (also from other database engines).
</li><li>Automatic collection of statistics (auto ANALYZE; AUTOVACUUM). See http://www.postgresql.org/docs/current/static/routine-vacuuming.html#AUTOVACUUM
</li><li>Optimization: automatic index creation suggestion using the trace file?
</li><li>Compression performance: don't allocate buffers, compress / expand in to out buffer
</li><li>Rebuild index functionality to shrink index size and improve performance
</li><li>Don't use deleteOnExit (bug 4513817: File.deleteOnExit consumes memory)
</li><li>Console: add accesskey to most important commands (A, AREA, BUTTON, INPUT, LABEL, LEGEND, TEXTAREA)
</li><li>Compression performance: don't allocate buffers, compress / expand in to out buffer.
</li><li>Rebuild index functionality to shrink index size and improve performance.
</li><li>Don't use deleteOnExit (bug 4513817: File.deleteOnExit consumes memory).
</li><li>Console: add accesskey to most important commands (A, AREA, BUTTON, INPUT, LABEL, LEGEND, TEXTAREA).
</li><li>Support nested outer joins (see todo.txt).
</li><li>Test performance again with SQL Server, Oracle, DB2
</li><li>Test with dbmonster (http://dbmonster.kernelpanic.pl/)
</li><li>Test with dbcopy (http://dbcopyplugin.sourceforge.net)
</li><li>Test with Spatial DB in a box / JTS: http://www.opengeospatial.org/standards/sfs - OpenGIS Implementation Specification
</li><li>Write more tests and documentation for MVCC (Multi Version Concurrency Control)
</li><li>Find a tool to view large text file (larger than 100 MB), with find, page up and down (like less), truncate before / after
</li><li>Implement, test, document XAConnection and so on
</li><li>Pluggable data type (for streaming, hashing, compression, validation, conversion, encryption)
</li><li>CHECK: find out what makes CHECK=TRUE slow, move to CHECK2
</li><li>Index usage for (ID, NAME)=(1, 'Hi'); document
</li><li>Make DDL (Data Definition) operations transactional
</li><li>RANK() and DENSE_RANK(), Partition using OVER()
</li><li>Set a connection read only (Connection.setReadOnly) or using a connection parameter
</li><li>Test performance again with SQL Server, Oracle, DB2.
</li><li>Test with dbmonster: http://dbmonster.kernelpanic.pl
</li><li>Test with dbcopy: http://dbcopyplugin.sourceforge.net
</li><li>Test with Spatial DB in a box / JTS: http://www.opengeospatial.org/standards/sfs - OpenGIS Implementation Specification.
</li><li>Write more tests and documentation for MVCC (Multi Version Concurrency Control).
</li><li>Find a tool to view large text file (larger than 100 MB), with find, page up and down (like less), truncate before / after.
</li><li>Implement, test, document XAConnection and so on.
</li><li>Pluggable data type (for streaming, hashing, compression, validation, conversion, encryption).
</li><li>CHECK: find out what makes CHECK=TRUE slow, move to CHECK2.
</li><li>Index usage for (ID, NAME)=(1, 'Hi'); document.
</li><li>Make DDL (Data Definition) operations transactional.
</li><li>RANK() and DENSE_RANK(), Partition using OVER().
</li><li>Set a connection read only (Connection.setReadOnly) or using a connection parameter.
</li><li>Optimizer: use an index for IS NULL and IS NOT NULL (including linked tables).
ID IS NOT NULL could be converted to ID &gt;= Integer.MIN_VALUE.
</li><li>Access rights: remember the owner of an object. COMMENT: allow owner of object to change it.
</li><li>Access rights: finer grained access control (grant access for specific functions)
</li><li>Suggestion: include Jetty as Servlet Container (like LAMP)
</li><li>Trace shipping to server
</li><li>Version check: docs / web console (using Javascript), and maybe in the library (using TCP/IP)
</li><li>Web server classloader: override findResource / getResourceFrom
</li><li>Cost for embedded temporary view is calculated wrong, if result is constant
</li><li>Comparison: pluggable sort order: natural sort
</li><li>Count index range query (count(*) where id between 10 and 20)
</li><li>Performance: update in-place
</li><li>Recursive Queries (see details)
</li><li>Eclipse plugin
</li><li>Asynchronous queries to support publish/subscribe: SELECT ... FOR READ WAIT [maxMillisToWait]
</li><li>Access rights: finer grained access control (grant access for specific functions).
</li><li>Suggestion: include Jetty as Servlet Container (like LAMP).
</li><li>Trace shipping to server.
</li><li>Version check: docs / web console (using Javascript), and maybe in the library (using TCP/IP).
</li><li>Web server classloader: override findResource / getResourceFrom.
</li><li>Cost for embedded temporary view is calculated wrong, if result is constant.
</li><li>Comparison: pluggable sort order: natural sort.
</li><li>Count index range query (count(*) where id between 10 and 20).
</li><li>Performance: update in-place.
</li><li>Recursive Queries (see details).
</li><li>Eclipse plugin.
</li><li>Asynchronous queries to support publish/subscribe: SELECT ... FOR READ WAIT [maxMillisToWait].
</li><li>Fulltext search Lucene: analyzer configuration.
</li><li>Fulltext search (native): reader / tokenizer / filter.
</li><li>Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files
</li><li>iReport to support H2
</li><li>Implement missing JDBC API (CallableStatement,...)
</li><li>Compression of the cache
</li><li>Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...)
</li><li>Drop with restrict (currently cascade is the default)
</li><li>JSON parser and functions
</li><li>Server: client ping from time to time (to avoid timeout - is timeout a problem?)
</li><li>Copy database: tool with config GUI and batch mode, extensible (example: compare)
</li><li>Linked schema using CSV files: one schema for a directory of files; support indexes for CSV files.
</li><li>iReport to support H2.
</li><li>Implement missing JDBC API (CallableStatement,...).
</li><li>Compression of the cache.
</li><li>Include SMPT (mail) server (at least client) (alert on cluster failure, low disk space,...).
</li><li>Drop with restrict (currently cascade is the default).
</li><li>JSON parser and functions.
</li><li>Server: client ping from time to time (to avoid timeout - is timeout a problem?).
</li><li>Copy database: tool with config GUI and batch mode, extensible (example: compare).
</li><li>Document, implement tool for long running transactions using user-defined compensation statements.
</li><li>Support SET TABLE DUAL READONLY
</li><li>Support SET TABLE DUAL READONLY.
</li><li>GCJ: what is the state now?
</li><li>Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server (see http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html)
</li><li>Optimization: log compression
</li><li>ROW_NUMBER() OVER([ORDER BY columnName])
</li><li>Support standard INFORMATION_SCHEMA tables, as defined in http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt; specially KEY_COLUMN_USAGE (http://dev.mysql.com/doc/refman/5.0/en/information-schema.html, http://www.xcdsql.org/Misc/INFORMATION_SCHEMA%20With%20Rolenames.gif)
</li><li>Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero
</li><li>Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R)
</li><li>Custom class loader to reload functions on demand
</li><li>Events for: database Startup, Connections, Login attempts, Disconnections, Prepare (after parsing), Web Server. See http://docs.openlinksw.com/virtuoso/fn_dbev_startup.html
</li><li>Optimization: log compression.
</li><li>ROW_NUMBER() OVER([ORDER BY columnName]).
</li><li>Support standard INFORMATION_SCHEMA tables, as defined in http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt - specially KEY_COLUMN_USAGE: http://dev.mysql.com/doc/refman/5.0/en/information-schema.html, http://www.xcdsql.org/Misc/INFORMATION_SCHEMA%20With%20Rolenames.gif
</li><li>Compatibility: in MySQL, HSQLDB, /0.0 is NULL; in PostgreSQL, Derby: division by zero.
</li><li>Functional tables should accept parameters from other tables (see FunctionMultiReturn) SELECT * FROM TEST T, P2C(T.A, T.R).
</li><li>Custom class loader to reload functions on demand.
</li><li>Test http://mysql-je.sourceforge.net/
</li><li>Close all files when closing the database (including LOB files that are open on the client side)
</li><li>Close all files when closing the database (including LOB files that are open on the client side).
</li><li>EXE file: maybe use http://jsmooth.sourceforge.net
</li><li>Performance: automatically build in-memory indexes if the whole table is in memory
</li><li>Performance: automatically build in-memory indexes if the whole table is in memory.
</li><li>H2 Console: the webclient could support more features like phpMyAdmin.
</li><li>Use Janino to convert Java to C++
</li><li>The HELP information schema can be directly exposed in the Console
</li><li>Maybe use the 0x1234 notation for binary fields, see MS SQL Server
</li><li>Support Oracle CONNECT BY in some way: http://www.adp-gmbh.ch/ora/sql/connect_by.html, http://philip.greenspun.com/sql/trees.html
</li><li>Use Janino to convert Java to C++.
</li><li>The HELP information schema can be directly exposed in the Console.
</li><li>Maybe use the 0x1234 notation for binary fields, see MS SQL Server.
</li><li>Support Oracle CONNECT BY in some way: http://www.adp-gmbh.ch/ora/sql/connect_by.html http://philip.greenspun.com/sql/trees.html
</li><li>SQL Server 2005, Oracle: support COUNT(*) OVER(). See http://www.orafusion.com/art_anlytc.htm
</li><li>SQL 2003 (http://www.wiscorp.com/sql_2003_standard.zip)
</li><li>Version column (number/sequence and timestamp based)
</li><li>SQL 2003: http://www.wiscorp.com/sql_2003_standard.zip
</li><li>Version column (number/sequence and timestamp based).
</li><li>Optimize getGeneratedKey: send last identity after each execute (server).
</li><li>Test and document UPDATE TEST SET (ID, NAME) = (SELECT ID*10, NAME || '!' FROM TEST T WHERE T.ID=TEST.ID);
</li><li>Max memory rows / max undo log size: use block count / row size not row count
</li><li>Support 123L syntax as in Java; example: SELECT (2000000000*2)
</li><li>Implement point-in-time recovery
</li><li>LIKE: improved version for larger texts (currently using naive search)
</li><li>Test and document UPDATE TEST SET (ID, NAME) = (SELECT ID*10, NAME || '!' FROM TEST T WHERE T.ID=TEST.ID).
</li><li>Max memory rows / max undo log size: use block count / row size not row count.
</li><li>Support 123L syntax as in Java; example: SELECT (2000000000*2).
</li><li>Implement point-in-time recovery.
</li><li>LIKE: improved version for larger texts (currently using naive search).
</li><li>Automatically convert to the next 'higher' data type whenever there is an overflow.
</li><li>Throw an exception when the application calls getInt on a Long (optional)
</li><li>Default date format for input and output (local date constants)
</li><li>Support custom Collators
</li><li>Document ROWNUM usage for reports: SELECT ROWNUM, * FROM (subquery)
</li><li>Clustering: when a database is back alive, automatically synchronize with the master
</li><li>File system that writes to two file systems (replication, replicating file system)
</li><li>Throw an exception when the application calls getInt on a Long (optional).
</li><li>Default date format for input and output (local date constants).
</li><li>Support custom Collators.
</li><li>Document ROWNUM usage for reports: SELECT ROWNUM, * FROM (subquery).
</li><li>Clustering: when a database is back alive, automatically synchronize with the master.
</li><li>File system that writes to two file systems (replication, replicating file system).
</li><li>Standalone tool to get relevant system properties and add it to the trace output.
</li><li>Support 'call proc(1=value)' (PostgreSQL, Oracle)
</li><li>JAMon (proxy jdbc driver)
</li><li>Console: improve editing data (Tab, Shift-Tab, Enter, Up, Down, Shift+Del?)
</li><li>Console: autocomplete Ctrl+Space inserts template
</li><li>Option to encrypt .trace.db file
</li><li>Support 'call proc(1=value)' (PostgreSQL, Oracle).
</li><li>JAMon (proxy jdbc driver).
</li><li>Console: improve editing data (Tab, Shift-Tab, Enter, Up, Down, Shift+Del?).
</li><li>Console: autocomplete Ctrl+Space inserts template.
</li><li>Option to encrypt .trace.db file.
</li><li>Write Behind Cache on SATA leads to data corruption See also http://sr5tech.com/write_back_cache_experiments.htm and http://www.jasonbrome.com/blog/archives/2004/04/03/writecache_enabled.html
</li><li>Functions with unknown return or parameter data types: serialize / deserialize
</li><li>Test if idle TCP connections are closed, and how to disable that
</li><li>Try using a factory for Row, Value[] (faster?), http://javolution.org/, alternative ObjectArray / IntArray
</li><li>Auto-Update feature for database, .jar file
</li><li>ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp
</li><li>Partial indexing (see PostgreSQL)
</li><li>Add GUI to build a custom version (embedded, fulltext,...) using build flags
</li><li>Functions with unknown return or parameter data types: serialize / deserialize.
</li><li>Test if idle TCP connections are closed, and how to disable that.
</li><li>Try using a factory for Row, Value[] (faster?), http://javolution.org/ (alternative ObjectArray / IntArray).
</li><li>Auto-Update feature for database, .jar file.
</li><li>ResultSet SimpleResultSet.readFromURL(String url): id varchar, state varchar, released timestamp.
</li><li>Partial indexing (see PostgreSQL).
</li><li>Add GUI to build a custom version (embedded, fulltext,...) using build flags.
</li><li>http://rubyforge.org/projects/hypersonic/
</li><li>Add comparator (x === y) : (x = y or (x is null and y is null))
</li><li>Try to create trace file even for read only databases
</li><li>Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app)
</li><li>Count on a column that can not be null could be optimized to COUNT(*)
</li><li>Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility)
</li><li>Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use)
</li><li>Backup tool should work with other databases as well
</li><li>Console: -ifExists doesn't work for the console. Add a flag to disable other dbs
</li><li>Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess)
</li><li>Add comparator (x === y) : (x = y or (x is null and y is null)).
</li><li>Try to create trace file even for read only databases.
</li><li>Add a sample application that runs the H2 unit test and writes the result to a file (so it can be included in the user app).
</li><li>Count on a column that can not be null could be optimized to COUNT(*).
</li><li>Table order: ALTER TABLE TEST ORDER BY NAME DESC (MySQL compatibility).
</li><li>Issue 159: System property for the H2 Console and TCP configuration (which .h2.server.properties and .h2.keystore to use).
</li><li>Backup tool should work with other databases as well.
</li><li>Console: -ifExists doesn't work for the console. Add a flag to disable other dbs.
</li><li>Check if 'FSUTIL behavior set disablelastaccess 1' improves the performance (fsutil behavior query disablelastaccess).
</li><li>Java static code analysis: http://pmd.sourceforge.net/
</li><li>Java static code analysis: http://www.eclipse.org/tptp/
</li><li>Compatibility for CREATE SCHEMA AUTHORIZATION
</li><li>Implement Clob / Blob truncate and the remaining functionality
</li><li>Maybe close LOBs after closing connection
</li><li>Tree join functionality
</li><li>Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ..
</li><li>Add H2 to Gem (Ruby install system)
</li><li>API for functions / user tables
</li><li>Order conditions inside AND / OR to optimize the performance
</li><li>Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER
</li><li>Compatibility for CREATE SCHEMA AUTHORIZATION.
</li><li>Implement Clob / Blob truncate and the remaining functionality.
</li><li>Maybe close LOBs after closing connection.
</li><li>Tree join functionality.
</li><li>Add multiple columns at the same time with ALTER TABLE .. ADD .. ADD ...
</li><li>Add H2 to Gem (Ruby install system).
</li><li>API for functions / user tables.
</li><li>Order conditions inside AND / OR to optimize the performance.
</li><li>Support Oracle functions: TRUNC, NVL2, TO_CHAR, TO_DATE, TO_NUMBER.
</li><li>Support linked JCR tables
</li><li>Make sure H2 is supported by Execute Query: http://executequery.org/
</li><li>Read InputStream when executing, as late as possible (maybe only embedded mode). Problem with re-execute.
</li><li>Native fulltext search: min word length; store word positions
</li><li>Add an option to the SCRIPT command to generate only portable / standard SQL
</li><li>Test Dezign for Databases (http://www.datanamic.com)
</li><li>Test Dezign for Databases: http://www.datanamic.com
</li><li>Fast library for parsing / formatting: http://javolution.org/
</li><li>Updatable Views (simple cases first)
</li><li>Improve create index performance
......@@ -248,7 +239,7 @@ See also <a href="build.html#providing_patches">Providing Patches</a>.
</li><li>Server: use one listener (detect if the request comes from an PG or TCP client)
</li><li>Support data type INTERVAL
</li><li>Optimize SELECT MIN(ID), MAX(ID), COUNT(*) FROM TEST WHERE ID BETWEEN 100 AND 200
</li><li>Sequence: PostgreSQL compatibility (rename, create) (http://www.postgresql.org/docs/8.2/static/sql-altersequence.html)
</li><li>Sequence: PostgreSQL compatibility (rename, create) http://www.postgresql.org/docs/8.2/static/sql-altersequence.html
</li><li>DISTINCT: support large result sets by sorting on all columns (additionally) and then removing duplicates.
</li><li>File system with a background writer thread; test if this is faster
</li><li>Better document the source code
......@@ -338,7 +329,6 @@ See also <a href="build.html#providing_patches">Providing Patches</a>.
</li><li>Support DatabaseMetaData.insertsAreDetected: updatable result sets should detect inserts.
</li><li>Auto-server: add option to define the IP address range or list.
</li><li>Index creation using deterministic functions.
</li><li>Use http://recaptcha.net somehow to secure the Google Group.
</li><li>Support DELETE with TOP or LIMIT. See also: http://dev.mysql.com/doc/refman/5.1/de/delete.html
</li><li>ANALYZE: use a bloom filter for each indexed column to estimate count of distinct values.
</li><li>ANALYZE: for unique indexes that allow null, count the number of null.
......
h2/src/test/org/h2/test/todo/tools.sql
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......@@ -7,8 +7,8 @@
-- TO_DATE
create alias TO_DATE as $$
java.util.Date toDate(String s) throws Exception {
return new java.text.SimpleDateFormat("yyyy.MM.dd").parse(s);
java.util.Date toDate(String s) throws Exception {
return new java.text.SimpleDateFormat("yyyy.MM.dd").parse(s);
}
$$;
call TO_DATE('1990.02.03')
......
h2/src/tools/org/h2/build/doc/dictionary.txt
浏览文件 @ fa002664
......@@ -635,3 +635,4 @@ explicitconstructorcall switchstatements members parens alignment declarations
jdt continuation codegen parenthesized tabulation ellipsis imple inits guardian
postfix iconified deiconified deactivated activated worker frequent utilities
workers appender recovers balanced serializing breaking austria wildam
census genealogy scapegoat gov
\ No newline at end of file
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