org.h2.constant
Class SysProperties

java.lang.Object
  org.h2.constant.SysProperties

public class SysProperties
extends java.lang.Object

The constants defined in this class are initialized from system properties. Those properties can be set when starting the virtual machine:

 java -Dh2.baseDir=/temp
 

They can be set within the application, but this must be done before loading any classes of this database (before loading the JDBC driver):

 System.setProperty("h2.baseDir", "/temp");
 

Field Summary

static boolean	ALIAS_COLUMN_NAME System property h2.aliasColumnName.
static boolean	ALLOW_BIG_DECIMAL_EXTENSIONS System property h2.allowBigDecimalExtensions (default: false).
static java.lang.String	ALLOWED_CLASSES System property h2.allowedClasses (default: *).
static java.lang.String	BIND_ADDRESS System property h2.bindAddress (default: *).
static java.lang.String	BROWSER System property h2.browser (default: null).
static int	CACHE_SIZE_DEFAULT System property h2.cacheSizeDefault (default: 16384).
static int	CACHE_SIZE_INDEX_DEFAULT INTERNAL
static int	CACHE_SIZE_INDEX_SHIFT System property h2.cacheSizeIndexShift (default: 3).
static java.lang.String	CACHE_TYPE_DEFAULT System property h2.cacheTypeDefault (default: LRU).
static boolean	CHECK System property h2.check (default: true).
static boolean	CHECK2 System property h2.check2 (default: true).
static java.lang.String	CLIENT_TRACE_DIRECTORY System property h2.clientTraceDirectory (default: trace.db/).
static int	COLLATOR_CACHE_SIZE System property h2.collatorCacheSize (default: 10000).
static int	DATASOURCE_TRACE_LEVEL System property h2.dataSourceTraceLevel (default: 1).
static java.lang.Character	DEFAULT_ESCAPE_CHAR System property h2.defaultEscape (default: \).
static int	DEFAULT_LOCK_MODE System property h2.defaultLockMode (default: 3).
static int	DEFAULT_MAX_LENGTH_INPLACE_LOB System property h2.defaultMaxLengthInplaceLob.
static int	DEFAULT_MAX_MEMORY_UNDO System property h2.defaultMaxMemoryUndo (default: 50000).
static int	DEFAULT_MAX_OPERATION_MEMORY System property h2.defaultMaxOperationMemory (default: 100000).
static int	DEFAULT_RESULT_SET_CONCURRENCY System property h2.defaultResultSetConcurrency (default: ResultSet.CONCUR_READ_ONLY).
static int	DELAY_WRONG_PASSWORD_MAX System property h2.delayWrongPasswordMax (default: 4000).
static int	DELAY_WRONG_PASSWORD_MIN System property h2.delayWrongPasswordMin (default: 250).
static boolean	DOLLAR_QUOTING System property h2.dollarQuoting (default: true).
static boolean	ENABLE_ANONYMOUS_SSL System property h2.enableAnonymousSSL (default: true).
static int	ESTIMATED_FUNCTION_TABLE_ROWS System property h2.estimatedFunctionTableRows (default: 1000).
static java.lang.String	FILE_ENCODING System property file.encoding (default: Cp1252).
static java.lang.String	FILE_SEPARATOR System property file.separator (default: /).
static java.lang.String	H2_COLLATOR_CACHE_SIZE INTERNAL
static java.lang.String	H2_LOG_DELETE_DELAY INTERNAL
static java.lang.String	H2_MAX_QUERY_TIMEOUT INTERNAL
static java.lang.String	H2_PAGE_STORE INTERNAL
static java.lang.String	JAVA_SPECIFICATION_VERSION System property java.specification.version.
static int	LARGE_RESULT_BUFFER_SIZE System property h2.largeResultBufferSize (default: 4096).
static java.lang.String	LINE_SEPARATOR System property line.separator (default: \n).
static boolean	LOB_FILES_IN_DIRECTORIES System property h2.lobFilesInDirectories.
static int	LOB_FILES_PER_DIRECTORY System property h2.lobFilesPerDirectory (default: 256).
static boolean	lobCloseBetweenReads System property h2.lobCloseBetweenReads (default: false).
static boolean	LOG_ALL_ERRORS System property h2.logAllErrors (default: false).
static java.lang.String	LOG_ALL_ERRORS_FILE System property h2.logAllErrorsFile (default: h2errors.txt).
static int	MAX_COMPACT_COUNT System property h2.maxCompactCount (default: Integer.MAX_VALUE).
static int	MAX_COMPACT_TIME System property h2.maxCompactTime (default: 1000).
static int	MAX_FILE_RETRY System property h2.maxFileRetry (default: 16).
static int	MAX_MEMORY_ROWS_DISTINCT System property h2.maxMemoryRowsDistinct (default: Integer.MAX_VALUE).
static int	MAX_QUERY_TIMEOUT System property h2.maxQueryTimeout (default: 0).
static int	MAX_RECONNECT System property h2.maxReconnect (default: 3).
static long	MAX_TRACE_DATA_LENGTH System property h2.maxTraceDataLength (default: 65535).
static int	MIN_COLUMN_NAME_MAP System property h2.minColumnNameMap (default: 3).
static int	MIN_WRITE_DELAY System property h2.minWriteDelay (default: 5).
static boolean	NIO_CLEANER_HACK System property h2.nioCleanerHack (default: true).
static boolean	NIO_LOAD_MAPPED System property h2.nioLoadMapped (default: false).
static boolean	NULL_CONCAT_IS_NULL System property h2.nullConcatIsNull.
static boolean	OBJECT_CACHE System property h2.objectCache (default: true).
static int	OBJECT_CACHE_MAX_PER_ELEMENT_SIZE System property h2.objectCacheMaxPerElementSize (default: 4096).
static int	OBJECT_CACHE_SIZE System property h2.objectCacheSize (default: 1024).
static boolean	OLD_COMMAND_LINE_OPTIONS System property h2.oldCommandLineOptions.
static boolean	OPTIMIZE_DISTINCT System property h2.optimizeDistinct (default: true).
static boolean	OPTIMIZE_DROP_DEPENDENCIES System property h2.optimizeDropDependencies (default: true).
static boolean	OPTIMIZE_EVALUATABLE_SUBQUERIES System property h2.optimizeEvaluatableSubqueries (default: true).
static boolean	OPTIMIZE_GROUP_SORTED System property h2.optimizeGroupSorted.
static boolean	OPTIMIZE_IN System property h2.optimizeIn (default: true).
static boolean	OPTIMIZE_IN_LIST System property h2.optimizeInList (default: false).
static boolean	OPTIMIZE_MIN_MAX System property h2.optimizeMinMax (default: true).
static boolean	OPTIMIZE_NOT System property h2.optimizeNot (default: true).
static boolean	OPTIMIZE_OR System property h2.optimizeOr (default: false).
static boolean	OPTIMIZE_SUBQUERY_CACHE System property h2.optimizeSubqueryCache (default: true).
static boolean	OPTIMIZE_TWO_EQUALS System property h2.optimizeTwoEquals (default: true).
static boolean	optimizeInJoin System property h2.optimizeInJoin (default: false).
static boolean	OVERFLOW_EXCEPTIONS System property h2.overflowExceptions (default: true).
static boolean	PAGE_STORE System property h2.pageStore.
static boolean	PAGE_STORE_INTERNAL_COUNT System property h2.pageStoreInternalCount (default: false).
static boolean	PAGE_STORE_TRIM System property h2.pageStoreTrim (default: true).
static java.lang.String	PG_DEFAULT_CLIENT_ENCODING System property h2.pgClientEncoding (default: UTF-8).
static boolean	RECOMPILE_ALWAYS System property h2.recompileAlways (default: false).
static int	RECONNECT_CHECK_DELAY System property h2.reconnectCheckDelay (default: 200).
static int	REDO_BUFFER_SIZE System property h2.redoBufferSize (default: 262144).
static int	RESERVE_MEMORY System property h2.reserveMemory (default: 524288).
static boolean	RETURN_LOB_OBJECTS System property h2.returnLobObjects.
static int	REUSE_SPACE_AFTER System property h2.reuseSpaceAfter (default: 16).
static boolean	REUSE_SPACE_BTREE_INDEX System property h2.reuseSpaceBtreeIndex (default: true).
static boolean	REUSE_SPACE_QUICKLY System property h2.reuseSpaceQuickly (default: true).
static boolean	runFinalize System property h2.runFinalize (default: true).
static int	SERVER_CACHED_OBJECTS System property h2.serverCachedObjects (default: 64).
static int	SERVER_RESULT_SET_FETCH_SIZE System property h2.serverResultSetFetchSize (default: 100).
static boolean	SHARE_LINKED_CONNECTIONS System property h2.shareLinkedConnections.
static int	SOCKET_CONNECT_TIMEOUT System property h2.socketConnectTimeout (default: 2000).
static boolean	SORT_NULLS_HIGH System property h2.sortNullsHigh (default: false).
static long	SPLIT_FILE_SIZE_SHIFT System property h2.splitFileSizeShift (default: 30).
static long	TIME_START The current time this class was loaded (in milliseconds).
static boolean	TRACE_IO System property h2.traceIO (default: false).
static java.lang.String	USER_HOME System property user.home (default: empty string).
static int	WEB_MAX_VALUE_LENGTH System property h2.webMaxValueLength (default: 10000).

Method Summary

static java.lang.String	getBaseDir() INTERNAL
static int	getCollatorCacheSize() INTERNAL
static int	getIntSetting(java.lang.String name, int defaultValue) INTERNAL
static int	getLogFileDeleteDelay() INTERNAL
static int	getMaxQueryTimeout() INTERNAL
static boolean	getPageStore() INTERNAL
static java.lang.String	getScriptDirectory() INTERNAL.
static java.lang.String	getStringSetting(java.lang.String name, java.lang.String defaultValue) INTERNAL
static void	setBaseDir(java.lang.String dir) INTERNAL
static void	setScriptDirectory(java.lang.String dir) INTERNAL

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

H2_MAX_QUERY_TIMEOUT

public static final java.lang.String H2_MAX_QUERY_TIMEOUT

INTERNAL

See Also:

Constant Field Values

H2_LOG_DELETE_DELAY

public static final java.lang.String H2_LOG_DELETE_DELAY

INTERNAL

See Also:

Constant Field Values

H2_COLLATOR_CACHE_SIZE

public static final java.lang.String H2_COLLATOR_CACHE_SIZE

INTERNAL

See Also:

Constant Field Values

H2_PAGE_STORE

public static final java.lang.String H2_PAGE_STORE

INTERNAL

See Also:

Constant Field Values

FILE_ENCODING

public static final java.lang.String FILE_ENCODING

System property file.encoding (default: Cp1252).
It is usually set by the system and is the default encoding used for the RunScript and CSV tool.

FILE_SEPARATOR

public static final java.lang.String FILE_SEPARATOR

System property file.separator (default: /).
It is usually set by the system, and used to build absolute file names.

JAVA_SPECIFICATION_VERSION

public static final java.lang.String JAVA_SPECIFICATION_VERSION

System property java.specification.version.
It is set by the system. Examples: 1.4, 1.5, 1.6.

LINE_SEPARATOR

public static final java.lang.String LINE_SEPARATOR

System property line.separator (default: \n).
It is usually set by the system, and used by the script and trace tools.

USER_HOME

public static final java.lang.String USER_HOME

System property user.home (default: empty string).
It is usually set by the system, and used as a replacement for ~ in file names.

ALIAS_COLUMN_NAME

public static final boolean ALIAS_COLUMN_NAME

System property h2.aliasColumnName.
When enabled, aliased columns (as in SELECT ID AS I FROM TEST) return the alias (I in this case) in ResultSetMetaData.getColumnName() and 'null' in getTableName(). If disabled, the real column name (ID in this case) and table name is returned. This setting only affects the default mode.

When using different modes, this feature is disabled for compatibility for all databases except MySQL. For MySQL, it is always enabled.

In version 1.0, it is enabled by default.

In version 1.1, it is disabled by default.

ALLOW_BIG_DECIMAL_EXTENSIONS

public static final boolean ALLOW_BIG_DECIMAL_EXTENSIONS

System property h2.allowBigDecimalExtensions (default: false).
When enabled, classes that extend BigDecimal are supported in PreparedStatement.setBigDecimal.

ALLOWED_CLASSES

public static final java.lang.String ALLOWED_CLASSES

System property h2.allowedClasses (default: *).
Comma separated list of class names or prefixes.

BROWSER

public static final java.lang.String BROWSER

System property h2.browser (default: null).
The preferred browser to use. If not set, the default browser is used. For Windows, to use the Internet Explorer, set this property to 'explorer'. For Mac OS, if the default browser is not Safari and you want to use Safari, use: java -Dh2.browser="open,-a,Safari,%url" ....

ENABLE_ANONYMOUS_SSL

public static final boolean ENABLE_ANONYMOUS_SSL

System property h2.enableAnonymousSSL (default: true).
When using SSL connection, the anonymous cipher suite SSL_DH_anon_WITH_RC4_128_MD5 should be enabled.

BIND_ADDRESS

public static final java.lang.String BIND_ADDRESS

System property h2.bindAddress (default: *).
Comma separated list of class names or prefixes.

CACHE_SIZE_DEFAULT

public static final int CACHE_SIZE_DEFAULT

System property h2.cacheSizeDefault (default: 16384).
The default cache size in KB.

CACHE_SIZE_INDEX_SHIFT

public static final int CACHE_SIZE_INDEX_SHIFT

System property h2.cacheSizeIndexShift (default: 3).
How many time the cache size value is divided by two to get the index cache size. The index cache size is calculated like this: cacheSize >> cacheSizeIndexShift.

CACHE_SIZE_INDEX_DEFAULT

public static final int CACHE_SIZE_INDEX_DEFAULT

INTERNAL

CACHE_TYPE_DEFAULT

public static final java.lang.String CACHE_TYPE_DEFAULT

System property h2.cacheTypeDefault (default: LRU).
How many time the cache size value is divided by two to get the index cache size. The index cache size is calculated like this: cacheSize >> cacheSizeIndexShift.

CHECK

public static final boolean CHECK

System property h2.check (default: true).
Assertions in the database engine.

CHECK2

public static final boolean CHECK2

System property h2.check2 (default: true).
Additional assertions in the database engine.

CLIENT_TRACE_DIRECTORY

public static final java.lang.String CLIENT_TRACE_DIRECTORY

System property h2.clientTraceDirectory (default: trace.db/).
Directory where the trace files of the JDBC client are stored (only for client / server).

DEFAULT_ESCAPE_CHAR

public static final java.lang.Character DEFAULT_ESCAPE_CHAR

System property h2.defaultEscape (default: \).
The default escape character for LIKE comparisons. To select no escape character, use an empty string.

DEFAULT_MAX_OPERATION_MEMORY

public static final int DEFAULT_MAX_OPERATION_MEMORY

System property h2.defaultMaxOperationMemory (default: 100000).
The default for the setting MAX_OPERATION_MEMORY.

DEFAULT_MAX_LENGTH_INPLACE_LOB

public static final int DEFAULT_MAX_LENGTH_INPLACE_LOB

System property h2.defaultMaxLengthInplaceLob.
The default maximum length of an LOB that is stored in the data file itself.

In version 1.1, the default is 1024.

In version 1.2, the default is 4096.

DEFAULT_RESULT_SET_CONCURRENCY

public static final int DEFAULT_RESULT_SET_CONCURRENCY

System property h2.defaultResultSetConcurrency (default: ResultSet.CONCUR_READ_ONLY).
The default result set concurrency for statements created with Connection.createStatement() or prepareStatement(String sql).

DATASOURCE_TRACE_LEVEL

public static final int DATASOURCE_TRACE_LEVEL

System property h2.dataSourceTraceLevel (default: 1).
The trace level of the data source implementation. Default is 1 for error.

DEFAULT_MAX_MEMORY_UNDO

public static final int DEFAULT_MAX_MEMORY_UNDO

System property h2.defaultMaxMemoryUndo (default: 50000).
The default value for the MAX_MEMORY_UNDO setting.

DEFAULT_LOCK_MODE

public static final int DEFAULT_LOCK_MODE

System property h2.defaultLockMode (default: 3).
The default value for the LOCK_MODE setting.

DELAY_WRONG_PASSWORD_MIN

public static final int DELAY_WRONG_PASSWORD_MIN

System property h2.delayWrongPasswordMin (default: 250).
The minimum delay in milliseconds before an exception is thrown for using the wrong user name or password. This slows down brute force attacks. The delay is reset to this value after a successful login. Unsuccessful logins will double the time until DELAY_WRONG_PASSWORD_MAX.

DELAY_WRONG_PASSWORD_MAX

public static final int DELAY_WRONG_PASSWORD_MAX

System property h2.delayWrongPasswordMax (default: 4000).
The maximum delay in milliseconds before an exception is thrown for using the wrong user name or password. This slows down brute force attacks. The delay is reset after a successful login. The value 0 means there is no maximum delay.

DOLLAR_QUOTING

public static final boolean DOLLAR_QUOTING

System property h2.dollarQuoting (default: true).
Dollar quoting is used to quote text without having to use escape characters. A dollar quoted string starts and ends with $$. Inside the text, $$ is not allowed.

ESTIMATED_FUNCTION_TABLE_ROWS

public static final int ESTIMATED_FUNCTION_TABLE_ROWS

System property h2.estimatedFunctionTableRows (default: 1000).
The estimated number of rows in a function table (for example, CSVREAD or FTL_SEARCH). This value is used by the optimizer.

LARGE_RESULT_BUFFER_SIZE

public static final int LARGE_RESULT_BUFFER_SIZE

System property h2.largeResultBufferSize (default: 4096).
Buffer size for large result sets. Set this value to 0 to disable the buffer.

lobCloseBetweenReads

public static boolean lobCloseBetweenReads

System property h2.lobCloseBetweenReads (default: false).
Close LOB files between read operations.

LOB_FILES_IN_DIRECTORIES

public static final boolean LOB_FILES_IN_DIRECTORIES

System property h2.lobFilesInDirectories.
Store LOB files in subdirectories.

In version 1.0, it is disabled by default.

In version 1.1, it is enabled by default.

LOB_FILES_PER_DIRECTORY

public static final int LOB_FILES_PER_DIRECTORY

System property h2.lobFilesPerDirectory (default: 256).
Maximum number of LOB files per directory.

LOG_ALL_ERRORS

public static final boolean LOG_ALL_ERRORS

System property h2.logAllErrors (default: false).
Write stack traces of any kind of error to a file.

LOG_ALL_ERRORS_FILE

public static final java.lang.String LOG_ALL_ERRORS_FILE

System property h2.logAllErrorsFile (default: h2errors.txt).
File name to log errors.

MAX_COMPACT_COUNT

public static final int MAX_COMPACT_COUNT

System property h2.maxCompactCount (default: Integer.MAX_VALUE).
The maximum number of pages to move when closing a database.

MAX_COMPACT_TIME

public static final int MAX_COMPACT_TIME

System property h2.maxCompactTime (default: 1000).
The maximum time in milliseconds used to compact a database when closing.

MAX_FILE_RETRY

public static final int MAX_FILE_RETRY

System property h2.maxFileRetry (default: 16).
Number of times to retry file delete and rename. in Windows, files can't be deleted if they are open. Waiting a bit can help (sometimes the Windows Explorer opens the files for a short time) may help. Sometimes, running garbage collection may close files if the user forgot to call Connection.close() or InputStream.close().

MAX_MEMORY_ROWS_DISTINCT

public static final int MAX_MEMORY_ROWS_DISTINCT

System property h2.maxMemoryRowsDistinct (default: Integer.MAX_VALUE).
The maximum number of rows kept in-memory for SELECT DISTINCT queries. If more than this number of rows are in a result set, a temporary table is used.

MAX_QUERY_TIMEOUT

public static final int MAX_QUERY_TIMEOUT

System property h2.maxQueryTimeout (default: 0).
The maximum timeout of a query. The default is 0, meaning no limit.

MAX_RECONNECT

public static final int MAX_RECONNECT

System property h2.maxReconnect (default: 3).
The maximum number of tries to reconnect in a row.

MAX_TRACE_DATA_LENGTH

public static final long MAX_TRACE_DATA_LENGTH

System property h2.maxTraceDataLength (default: 65535).
The maximum size of a LOB value that is written as data to the trace system.

MIN_COLUMN_NAME_MAP

public static final int MIN_COLUMN_NAME_MAP

System property h2.minColumnNameMap (default: 3).
The minimum number of columns where a hash table is created when result set methods with column name (instead of column index) parameter are called.

MIN_WRITE_DELAY

public static final int MIN_WRITE_DELAY

System property h2.minWriteDelay (default: 5).
The minimum write delay that causes commits to be delayed.

NIO_LOAD_MAPPED

public static final boolean NIO_LOAD_MAPPED

System property h2.nioLoadMapped (default: false).
If the mapped buffer should be loaded when the file is opened. This can improve performance.

NIO_CLEANER_HACK

public static final boolean NIO_CLEANER_HACK

System property h2.nioCleanerHack (default: true).
If possible, use a hack to un-map the mapped file. See also http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4724038

NULL_CONCAT_IS_NULL

public static final boolean NULL_CONCAT_IS_NULL

System property h2.nullConcatIsNull.
Concatenation with NULL results in NULL. Usually, NULL is treated as an empty string if only one of the operands is NULL, and NULL is only returned if both operands are NULL.

In version 1.1, it is disabled by default.

In version 1.2, it is enabled by default.

OBJECT_CACHE

public static final boolean OBJECT_CACHE

System property h2.objectCache (default: true).
Cache commonly used objects (integers, strings).

OBJECT_CACHE_MAX_PER_ELEMENT_SIZE

public static final int OBJECT_CACHE_MAX_PER_ELEMENT_SIZE

System property h2.objectCacheMaxPerElementSize (default: 4096).
Maximum size of an object in the cache.

OBJECT_CACHE_SIZE

public static final int OBJECT_CACHE_SIZE

System property h2.objectCacheSize (default: 1024).
Maximum size of an object in the cache. This value must be a power of 2.

OLD_COMMAND_LINE_OPTIONS

public static final boolean OLD_COMMAND_LINE_OPTIONS

System property h2.oldCommandLineOptions.
Support old command line options.

In version 1.0, it is enabled by default.

In version 1.1, it is disabled by default.

OPTIMIZE_DROP_DEPENDENCIES

public static final boolean OPTIMIZE_DROP_DEPENDENCIES

System property h2.optimizeDropDependencies (default: true).
Improve the performance of DROP and DROP ALL OBJECTS by quicker scanning if other objects depend on this object.

OPTIMIZE_DISTINCT

public static final boolean OPTIMIZE_DISTINCT

System property h2.optimizeDistinct (default: true).
Improve the performance of simple DISTINCT queries if an index is available for the given column. The optimization is used if:

• The select is a single column query without condition
• The query contains only one table, and no group by
• There is only one table involved
• There is an ascending index on the column
• The selectivity of the column is below 20

OPTIMIZE_EVALUATABLE_SUBQUERIES

public static final boolean OPTIMIZE_EVALUATABLE_SUBQUERIES

System property h2.optimizeEvaluatableSubqueries (default: true).
Optimize subqueries that are not dependent on the outer query.

OPTIMIZE_GROUP_SORTED

public static final boolean OPTIMIZE_GROUP_SORTED

System property h2.optimizeGroupSorted.
Optimize GROUP BY queries if an index can be used that matches the group by columns.

In version 1.0, it is disabled by default.

In version 1.1, it is enabled by default.

OPTIMIZE_IN

public static final boolean OPTIMIZE_IN

System property h2.optimizeIn (default: true).
Optimize IN(...) comparisons.

OPTIMIZE_IN_LIST

public static final boolean OPTIMIZE_IN_LIST

System property h2.optimizeInList (default: false).
Optimize IN(...) and IN(SELECT ...) comparisons. This includes optimization for SELECT, DELETE, and UPDATE. Overrides h2.optimizeIn and h2.optimizeInJoin if enabled.

In version 1.1, it is disabled by default.

In version 1.2, it is enabled by default.

optimizeInJoin

public static boolean optimizeInJoin

System property h2.optimizeInJoin (default: false).
Optimize IN(...) comparisons by converting them to inner joins.

In version 1.0, it is disabled by default.

In version 1.1, it is enabled by default.

OPTIMIZE_MIN_MAX

public static final boolean OPTIMIZE_MIN_MAX

System property h2.optimizeMinMax (default: true).
Optimize MIN and MAX aggregate functions.

OPTIMIZE_NOT

public static final boolean OPTIMIZE_NOT

System property h2.optimizeNot (default: true).
Optimize NOT conditions by removing the NOT and inverting the condition.

OPTIMIZE_OR

public static final boolean OPTIMIZE_OR

System property h2.optimizeOr (default: false).
Convert (C=? OR C=?) to (C IN(?, ?)).

OPTIMIZE_SUBQUERY_CACHE

public static final boolean OPTIMIZE_SUBQUERY_CACHE

System property h2.optimizeSubqueryCache (default: true).
Cache subquery results.

OPTIMIZE_TWO_EQUALS

public static final boolean OPTIMIZE_TWO_EQUALS

System property h2.optimizeTwoEquals (default: true).
Optimize expressions of the form A=B AND B=1. In this case, AND A=1 is added so an index on A can be used.

OVERFLOW_EXCEPTIONS

public static final boolean OVERFLOW_EXCEPTIONS

System property h2.overflowExceptions (default: true).
Throw an exception on integer overflows.

PAGE_STORE

public static final boolean PAGE_STORE

System property h2.pageStore.
Use the 'page store' database file format for new databases.

In version 1.1, it is disabled by default.

In version 1.2, it is enabled by default.

PAGE_STORE_TRIM

public static final boolean PAGE_STORE_TRIM

System property h2.pageStoreTrim (default: true).
Trim the database size when closing.

PAGE_STORE_INTERNAL_COUNT

public static final boolean PAGE_STORE_INTERNAL_COUNT

System property h2.pageStoreInternalCount (default: false).
Update the row counts on a node level.

PG_DEFAULT_CLIENT_ENCODING

public static final java.lang.String PG_DEFAULT_CLIENT_ENCODING

System property h2.pgClientEncoding (default: UTF-8).
Default client encoding for PG server. It is used if the client does not sends his encoding.

RECOMPILE_ALWAYS

public static final boolean RECOMPILE_ALWAYS

System property h2.recompileAlways (default: false).
Always recompile prepared statements.

RECONNECT_CHECK_DELAY

public static final int RECONNECT_CHECK_DELAY

System property h2.reconnectCheckDelay (default: 200).
Check the .lock.db file every this many milliseconds to detect that the database was changed. The process writing to the database must first notify a change in the .lock.db file, then wait twice this many milliseconds before updating the database.

REDO_BUFFER_SIZE

public static final int REDO_BUFFER_SIZE

System property h2.redoBufferSize (default: 262144).
Size of the redo buffer (used at startup when recovering).

RESERVE_MEMORY

public static final int RESERVE_MEMORY

System property h2.reserveMemory (default: 524288).
This many bytes in main memory are allocated as a reserve. This reserve is freed up when if no memory is available, so that rolling back a large transaction is easier.

RETURN_LOB_OBJECTS

public static final boolean RETURN_LOB_OBJECTS

System property h2.returnLobObjects.
When true, ResultSet.getObject for CLOB or BLOB will return a java.sql.Clob / java.sql.Blob object. When set to false, it will return a java.io.Reader / java.io.InputStream.

In version 1.0, it is disabled by default.

In version 1.1, it is enabled by default.

REUSE_SPACE_AFTER

public static final int REUSE_SPACE_AFTER

System property h2.reuseSpaceAfter (default: 16).
Reuse space in database files after this many pages are free.

REUSE_SPACE_BTREE_INDEX

public static final boolean REUSE_SPACE_BTREE_INDEX

System property h2.reuseSpaceBtreeIndex (default: true).
Reuse space after deleting or updating many rows in a b-tree index.

REUSE_SPACE_QUICKLY

public static final boolean REUSE_SPACE_QUICKLY

System property h2.reuseSpaceQuickly (default: true).
Reuse space in database files quickly.

runFinalize

public static boolean runFinalize

System property h2.runFinalize (default: true).
Run finalizers to detect unclosed connections.

SERVER_CACHED_OBJECTS

public static final int SERVER_CACHED_OBJECTS

System property h2.serverCachedObjects (default: 64).
TCP Server: number of cached objects per session.

SERVER_RESULT_SET_FETCH_SIZE

public static final int SERVER_RESULT_SET_FETCH_SIZE

System property h2.serverResultSetFetchSize (default: 100).
The default result set fetch size when using the server mode.

SHARE_LINKED_CONNECTIONS

public static final boolean SHARE_LINKED_CONNECTIONS

System property h2.shareLinkedConnections.
Linked connections should be shared, that means connections to the same database should be used for all linked tables that connect to the same database.

In version 1.0, it is disabled by default.

In version 1.1, it is enabled by default.

SOCKET_CONNECT_TIMEOUT

public static final int SOCKET_CONNECT_TIMEOUT

System property h2.socketConnectTimeout (default: 2000).
The timeout in milliseconds to connect to a server.

SORT_NULLS_HIGH

public static final boolean SORT_NULLS_HIGH

System property h2.sortNullsHigh (default: false).
Invert the default sorting behavior for NULL values, such that NULL values are sorted to the end of a result set in an ascending sort and to the beginning of a result set in a descending sort.

SPLIT_FILE_SIZE_SHIFT

public static final long SPLIT_FILE_SIZE_SHIFT

System property h2.splitFileSizeShift (default: 30).
The maximum file size of a split file is 1L << x.

TRACE_IO

public static final boolean TRACE_IO

System property h2.traceIO (default: false).
Trace all I/O operations.

WEB_MAX_VALUE_LENGTH

public static final int WEB_MAX_VALUE_LENGTH

System property h2.webMaxValueLength (default: 10000).
The H2 Console will abbreviate (truncate) result values larger than this size.

COLLATOR_CACHE_SIZE

public static final int COLLATOR_CACHE_SIZE

System property h2.collatorCacheSize (default: 10000).
The cache size for collation keys (in elements). Used when a collator has been set for the database.

TIME_START

public static final long TIME_START

The current time this class was loaded (in milliseconds).

Method Detail

getStringSetting

public static java.lang.String getStringSetting(java.lang.String name,
                                                java.lang.String defaultValue)

INTERNAL

getIntSetting

public static int getIntSetting(java.lang.String name,
                                int defaultValue)

INTERNAL

setBaseDir

public static void setBaseDir(java.lang.String dir)

INTERNAL

getBaseDir

public static java.lang.String getBaseDir()

INTERNAL

getScriptDirectory

public static java.lang.String getScriptDirectory()

INTERNAL. System property h2.scriptDirectory (default: empty string).
Relative or absolute directory where the script files are stored to or read from.

setScriptDirectory

public static void setScriptDirectory(java.lang.String dir)

INTERNAL

getMaxQueryTimeout

public static int getMaxQueryTimeout()

INTERNAL

getLogFileDeleteDelay

public static int getLogFileDeleteDelay()

INTERNAL

getCollatorCacheSize

public static int getCollatorCacheSize()

INTERNAL

getPageStore

public static boolean getPageStore()

INTERNAL