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. Some system properties are per machine settings, and others are as a last resort and temporary solution to work around a problem in the application or database engine. Also, there are system properties to enable features that are not yet fully tested or that are not backward compatible.

System 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 (default: false).
static boolean	ALLOW_BIG_DECIMAL_EXTENSIONS System property h2.allowBigDecimalExtensions (default: false).
static java.lang.String	ALLOWED_CLASSES System property h2.allowedClasses (default: *).
static int	ANALYZE_AUTO System property h2.analyzeAuto (default: 0).
static int	ANALYZE_SAMPLE System property h2.analyzeSample (default: 10000).
static java.lang.String	BIND_ADDRESS System property h2.bindAddress (default: null).
static java.lang.String	BROWSER System property h2.browser (default: null).
static int	CACHE_SIZE_DEFAULT System property h2.cacheSizeDefault (default: 16384).
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 boolean	CONSOLE_STREAM System property h2.consoleStream (default: true).
static boolean	DATABASE_TO_UPPER System property h2.databaseToUpper (default: true).
static int	DATASOURCE_TRACE_LEVEL System property h2.dataSourceTraceLevel (default: 1).
static java.lang.String	DEFAULT_ESCAPE 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 (default: 4096).
static int	DEFAULT_MAX_LENGTH_INPLACE_LOB2 System property h2.defaultMaxLengthInplaceLob2 (default: 128).
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	DROP_RESTRICT System property h2.dropRestrict (default: false).
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 boolean	FUNCTIONS_IN_SCHEMA System property h2.functionsInSchema (default: false).
static java.lang.String	H2_COLLATOR_CACHE_SIZE INTERNAL
static java.lang.String	H2_MAX_QUERY_TIMEOUT INTERNAL
static java.lang.String	H2_SCRIPT_DIRECTORY INTERNAL
static boolean	IDENTIFIERS_TO_UPPER System property h2.identifiersToUpper (default: true).
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 boolean	LARGE_TRANSACTIONS System property h2.largeTransactions (default: false).
static java.lang.String	LINE_SEPARATOR System property line.separator (default: \n).
static int	LOB_FILES_PER_DIRECTORY System property h2.lobFilesPerDirectory (default: 256).
static boolean	LOB_IN_DATABASE System property h2.lobInDatabase (default: false).
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_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	NESTED_JOINS System property h2.nestedJoins (default: false).
static boolean	NIO_CLEANER_HACK System property h2.nioCleanerHack (default: true).
static boolean	NIO_LOAD_MAPPED System property h2.nioLoadMapped (default: false).
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	OPTIMIZE_DISTINCT System property h2.optimizeDistinct (default: true).
static boolean	OPTIMIZE_EVALUATABLE_SUBQUERIES System property h2.optimizeEvaluatableSubqueries (default: true).
static boolean	OPTIMIZE_IN_LIST System property h2.optimizeInList (default: true).
static boolean	OPTIMIZE_IS_NULL System property h2.optimizeIsNull (default: false).
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 int	PAGE_SIZE System property h2.pageSize (default: 2048).
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 java.lang.String	PREFIX_TEMP_FILE System property h2.prefixTempFile (default: h2.temp).
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 (default: true).
static boolean	runFinalize System property h2.runFinalize (default: true).
static boolean	SELECT_FOR_UPDATE_MVCC System property h2.selectForUpdateMvcc (default: false).
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 (default: true).
static int	SOCKET_CONNECT_RETRY System property h2.socketConnectRetry (default: 16).
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 java.lang.String	SYNC_METHOD System property h2.syncMethod (default: sync).
static boolean	TRACE_IO System property h2.traceIO (default: false).
static java.lang.String	USER_HOME System property user.home (empty string if not set).
static int	WEB_MAX_VALUE_LENGTH System property h2.webMaxValueLength (default: 100000).

Method Summary

static java.lang.String	getBaseDir() INTERNAL
static int	getCollatorCacheSize() System property h2.collatorCacheSize (default: 32000).
static int	getIntSetting(java.lang.String name, int defaultValue) INTERNAL
static int	getMaxQueryTimeout() System property h2.maxQueryTimeout (default: 0).
static java.lang.String	getScriptDirectory() System property h2.scriptDirectory (default: empty string).
static java.lang.String	getStringSetting(java.lang.String name, java.lang.String defaultValue) INTERNAL
static void	setBaseDir(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_SCRIPT_DIRECTORY

public static final java.lang.String H2_SCRIPT_DIRECTORY

INTERNAL

See Also:

Constant Field Values

H2_MAX_QUERY_TIMEOUT

public static final java.lang.String H2_MAX_QUERY_TIMEOUT

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

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 (empty string if not set).
It is usually set by the system, and used as a replacement for ~ in file names.

ANALYZE_SAMPLE

public static final int ANALYZE_SAMPLE

System property h2.analyzeSample (default: 10000).
The default sample size when analyzing a table.

ANALYZE_AUTO

public static final int ANALYZE_AUTO

System property h2.analyzeAuto (default: 0).
After changing this many rows, ANALYZE is automatically run for a table. Automatically running ANALYZE is disabled if set to 0. If set to 1000, then ANALYZE will run against each user table after about 1000 changes to that table. The time between running ANALYZE doubles each time since starting the database. It is not run on local temporary tables, and tables that have a trigger on SELECT.

ALIAS_COLUMN_NAME

public static final boolean ALIAS_COLUMN_NAME

System property h2.aliasColumnName (default: false).
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.

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: null).
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_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).

CONSOLE_STREAM

public static final boolean CONSOLE_STREAM

System property h2.consoleStream (default: true).
H2 Console: stream query results.

DATABASE_TO_UPPER

public static final boolean DATABASE_TO_UPPER

System property h2.databaseToUpper (default: true).
Database short names are converted to uppercase for the DATABASE() function, and in the CATALOG column of all database meta data methods. Setting this to "false" is experimental.

DEFAULT_ESCAPE

public static final java.lang.String DEFAULT_ESCAPE

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 (default: 4096).
The default maximum length of an LOB that is stored in the database file.

DEFAULT_MAX_LENGTH_INPLACE_LOB2

public static final int DEFAULT_MAX_LENGTH_INPLACE_LOB2

System property h2.defaultMaxLengthInplaceLob2 (default: 128).
The default maximum length of an LOB that is stored with the record itself. Only used if h2.lobInDatabase is enabled.

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. To disable the delay, set this system property to 0.

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.

DROP_RESTRICT

public static final boolean DROP_RESTRICT

System property h2.dropRestrict (default: false).
Whether the default action for DROP TABLE and DROP VIEW is RESTRICT. For most databases, the default action is RESTRICT, but for compatibility with older versions of H2 the default action is currently CASCADE. This will change in a future version of H2.

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.

FUNCTIONS_IN_SCHEMA

public static final boolean FUNCTIONS_IN_SCHEMA

System property h2.functionsInSchema (default: false).
If set, all functions are stored in a schema. Specially, the SCRIPT statement will always include the schema name in the CREATE ALIAS statement. This is not backward compatible with H2 versions 1.2.134 and older.

IDENTIFIERS_TO_UPPER

public static final boolean IDENTIFIERS_TO_UPPER

System property h2.identifiersToUpper (default: true).
Unquoted identifiers in SQL statements are case insensitive and converted to uppercase.

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.

LARGE_TRANSACTIONS

public static final boolean LARGE_TRANSACTIONS

System property h2.largeTransactions (default: false).
Support very large transactions

lobCloseBetweenReads

public static boolean lobCloseBetweenReads

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

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.

LOB_IN_DATABASE

public static final boolean LOB_IN_DATABASE

System property h2.lobInDatabase (default: false).
Store LOB files in the database.

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_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.

NESTED_JOINS

public static final boolean NESTED_JOINS

System property h2.nestedJoins (default: false).
Whether nested joins should be supported.

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

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.

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_IN_LIST

public static final boolean OPTIMIZE_IN_LIST

System property h2.optimizeInList (default: true).
Optimize IN(...) and IN(SELECT ...) comparisons. This includes optimization for SELECT, DELETE, and UPDATE.

OPTIMIZE_IS_NULL

public static final boolean OPTIMIZE_IS_NULL

System property h2.optimizeIsNull (default: false).
Use an index for condition of the form columnName IS NULL.

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.

PAGE_SIZE

public static final int PAGE_SIZE

System property h2.pageSize (default: 2048).
The page size to use for new databases.

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.

PREFIX_TEMP_FILE

public static final java.lang.String PREFIX_TEMP_FILE

System property h2.prefixTempFile (default: h2.temp).
The prefix for temporary files in the temp directory.

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 (default: true).
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.

runFinalize

public static boolean runFinalize

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

SELECT_FOR_UPDATE_MVCC

public static final boolean SELECT_FOR_UPDATE_MVCC

System property h2.selectForUpdateMvcc (default: false).
If set, SELECT .. FOR UPDATE queries lock the rows when using MVCC.

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 (default: true).
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.

SOCKET_CONNECT_RETRY

public static final int SOCKET_CONNECT_RETRY

System property h2.socketConnectRetry (default: 16).
The number of times to retry opening a socket. Windows sometimes fails to open a socket, see bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6213296

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.

SYNC_METHOD

public static final java.lang.String SYNC_METHOD

System property h2.syncMethod (default: sync).
What method to call when closing the database, on checkpoint, and on CHECKPOINT SYNC. The following options are supported: "sync" (default): RandomAccessFile.getFD().sync(); "force": RandomAccessFile.getChannel().force(true); "forceFalse": RandomAccessFile.getChannel().force(false); "": do not call a method (fast but there is a risk of data loss on power failure).

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: 100000).
The H2 Console will abbreviate (truncate) result values larger than this size. The data in the database is not truncated, it is only to avoid out of memory in the H2 Console application.

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()

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

Returns:

the current value

getMaxQueryTimeout

public static int getMaxQueryTimeout()

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

Returns:

the current value

getCollatorCacheSize

public static int getCollatorCacheSize()

System property h2.collatorCacheSize (default: 32000).
The cache size for collation keys (in elements). Used when a collator has been set for the database.

Returns:

the current value