Java DB

Apache Derby

Derby Reference Manual

Derby Getting Started
Derby Reference Manual
Derby Developer's Guide
Derby Performance Tuning
Derby Server and Admin Guide
Derby Tools and Utilities
Derby Reference Manual
-SQL language reference
-Capitalization and special characters
-SQL identifiers
-Rules for SQL92 identifiers
-SQL92Identifier
-column-Name
-correlation-Name
-new-table-Name
-schemaName
-Simple-column-Name
-synonym-Name
-table-Name
-view-Name
-index-Name
-constraint-Name
-cursor-Name
-TriggerName
-
-RoleName
-Interaction with the dependency system
-ALTER TABLE
-CALL (PROCEDURE)
-CREATE statements
-DECLARE GLOBAL TEMPORARY TABLE
-DELETE
-DROP statements
-GRANT
-INSERT
-LOCK TABLE
-RENAME statements
-REVOKE
-SET statements
-SELECT
-UPDATE
-SQL clauses
-SQL expressions
-JOIN operations
-SQL queries
-Built-in functions
-Standard built-in functions
-Aggregates (set functions)
-ABS or ABSVAL function
-ACOS function
-ASIN function
-ATAN function
-ATAN2 function
-AVG function
-BIGINT function
-CASE expressions
-CAST function
-CEIL or CEILING function
-CHAR function
-COALESCE function
-Concatenation operator
-COS function
-COSH function
-COT function
-COUNT function
-COUNT(*) function
-CURRENT DATE function
-CURRENT_DATE function
-CURRENT ISOLATION function
-CURRENT_ROLE function
-CURRENT SCHEMA function
-CURRENT TIME function
-CURRENT_TIME function
-CURRENT TIMESTAMP function
-CURRENT_TIMESTAMP function
-CURRENT_USER function
-DATE function
-DAY function
-DEGREES function
-DOUBLE function
-EXP function
-FLOOR function
-HOUR function
-IDENTITY_VAL_LOCAL function
-INTEGER function
-LCASE or LOWER function
-LENGTH function
-LN or LOG function
-LOG10 function
-LOCATE function
-LTRIM function
-MAX function
-MIN function
-MINUTE function
-MOD function
-MONTH function
-NULLIF expressions
-PI function
-RADIANS function
-RANDOM function
-RAND function
-ROW_NUMBER function
-RTRIM function
-SECOND function
-SESSION_USER function
-SIGN function
-SIN function
-SINH function
-SMALLINT function
-SQRT function
-SUBSTR function
-SUM function
-TAN function
-TANH function
-TIME function
-TIMESTAMP function
-TRIM function
-UCASE or UPPER function
-USER function
-VARCHAR function
-XMLEXISTS operator
-XMLPARSE operator
-XMLQUERY operator
-XMLSERIALIZE operator
-YEAR function
-Built-in system functions
-Built-in system procedures
-SYSCS_B ACKUP_D ATABASE
-SYSCS_BAC KUP_DATAB ASE_NOWAIT
-SYSCS_BACKUP_DAT ABASE_AND_ENABLE _LOG_ARCHIVE_MODE
-SYSCS_BACKUP_DATAB ASE_AND_ENABLE_LOG ARCHIVE_MODE_NOWAIT
-SYSCS_EMP TY_STATEM ENT_CACHE
-SYSCS_CH ECKPOINT _DATABASE
-SYSCS_COMPRESS_TABLE
-SYSCS_INP LACE_COMP RESS_TABLE
-SYSCS_DISA BLE_LOG_AR CHIVE_MODE
-SYSCS_EXPORT_TABLE
-SYSCS_EXPOR T_TABLE_LOB S_TO_EXTFILE
-SYSCS_EXPORT_QUERY
-SYSCS_EXPOR T_QUERY_LOB S_TO_EXTFILE
-SYSCS_IMPORT_DATA
-SYSCS_IMPOR T_DATA_LOBS FROM_EXTFILE
-SYSCS_IMPORT_TABLE
-SYSCS_IMPORT _TABLE_LOBS_ FROM_EXTFILE
-SYSCS_F REEZE_D ATABASE
-SYSCS_U NFREEZE DATABASE
-SYSCS_REL OAD_SECUR ITY_POLICY
-SYSCS_SET _DATABASE _PROPERTY
-SYSCS_SET _RUNTIMES TATISTICS
-SYSCS_SET _STATISTI CS_TIMING
-SYSCS_S ET_XPLA N_SCHEMA
-SYSCS_S ET_XPLA IN_MODE
-SYSCS_S ET_USER _ACCESS
-SYSCS_U PDATE_S ATISTICS
-SYSCS_DIAG diagnostic tables and functions
-Data types
-Argument matching
-SQL reserved words
-Derby support for SQL-92 features
-Derby system tables
-XPLAIN style tables
-Derby exception messages and SQL states
-JDBC reference
-java.sql.Driver interface
-java. sql. DriverManager. getConnection method
-java.sql.Connection interface
-java. sql. DatabaseMetaData interface
-java.sql.Statement interface
-java. sql. CallableStatement interface
-java. sql. PreparedStatement interface
-java.sql.ResultSet interface
-java. sql. ResultSetMetaData interface
-java.sql.SQLException class
-java.sql.SQLWarning class
-java.sql.Savepoint interface
-Mapping of java. sql. Types to SQL types
-JDBC Package for Connected Device Configuration/Foundation Profile (JSR 169)
-JDBC 4.0-only features
-Setting attributes for the database connection URL
-bootPassword= key attribute
-collation= collation attribute
-create= true attribute
-createFrom= path attribute
-databaseName= nameofDatabase attribute
-dataEncryption= true attribute
-drop= true attribute
-encryptionKey= key attribute
-encryptionProvider= providerName attribute
-encryptionAlgorithm= algorithm attribute
-failover= true attribute
-logDevice= logDirectoryPath attribute
-newEncryptionKey= key attribute
-newBootPassword= newPassword attribute
-password= userPassword attribute
-restoreFrom= path attribute
-rollForwardRecoveryFrom= path attribute
-securityMechanism= value attribute
-shutdown= true attribute
-slaveHost= hostname attribute
-slavePort= portValue attribute
-startMaster= true attribute
-startSlave= true attribute
-stopMaster= true attribute
-stopSlave= true attribute
-territory= ll_CC attribute
-traceDirectory= path attribute
-traceFile= path attribute
-traceFileAppend= true attribute
-traceLevel= value attribute
-upgrade= true attribute
-user= userName attribute
-ssl= sslMode attribute
-Creating a connection without specifying attributes
-Derby property reference
-Scope of Derby properties
-Dynamic and static properties
-Derby properties
-derby. authentication. builtin. algorithm
-derby. authentication. ldap. searchAuthDN
-derby. authentication. ldap. searchAuthPW
-derby. authentication. ldap. searchBase
-derby. authentication. ldap. searchFilter
-
-
-derby. connection. requireAuthentication
-derby. database. defaultConnectionMode
-derby. database. forceDatabaseLock
-
-
-
-derby. database. readOnlyAccessUsers
-derby. database. sqlAuthorization
-derby.infolog.append
-derby. jdbc. xaTransactionTimeout
-
-derby. language. logStatementText
-
-
-derby. locks. escalationThreshold
-derby.locks.monitor
-
-derby. replication. logBufferSize
-derby. replication. maxLogShippingInterval
-derby. replication. minLogShippingInterval
-
-
-derby. storage. minimumRecordSize
-
-derby. storage. pageReservedSpace
-
-
-
-
-
-
-derby. stream. error. logSeverityLevel
-derby.system.bootAll
-
-derby.system.home
-derby.user.UserName
-J2EE Compliance: Java Transaction API and javax. sql Interfaces
-Derby API
-Supported territories
-Derby limitations

 

derby.storage.initialPages

Function

The on-disk size of a Derby table grows by one page at a time until eight pages of user data (or nine pages of total disk use; one is used for overhead) have been allocated. Then it will grow by eight pages at a time if possible.

A Derby table or index can be created with a number of pages already pre-allocated. To do so, specify the property prior to the CREATE TABLE or CREATE INDEX statement.

Define the number of user pages the table or index is to be created with. The purpose of this property is to preallocate a table or index of reasonable size if the user expects that a large amount of data will be inserted into the table or index. A table or index that has the pre-allocated pages will enjoy a small performance improvement over a table or index that has no pre-allocated pages when the data are loaded.

The total desired size of the table or index should be the following number of bytes:

(1 + derby.storage.initialPages) * derby.storage.pageSize

When you create a table or an index after setting this property, Derby attempts to preallocate the requested number of user pages. However, the operations do not fail even if they are unable to preallocate the requested number of pages, as long as they allocate at least one page.

Default

1 page.

Minimum value

The minimum number of initialPages is 1.

Maximum value

The maximum number of initialPages is 1000.

Example

-- system-wide property 
derby.storage.initialPages=30

-- database-wide property 
CALL SYSCS_UTIL.SYSCS_SET_DATABASE_PROPERTY( 
'derby.storage.initialPages', '30')
Parent topic: Derby properties
Related reference
 

javadb@jdbcurl.com