org.firebirdsql.management

Interface StatisticsManager

All Superinterfaces:

ServiceManager

All Known Implementing Classes:

FBStatisticsManager

public interface StatisticsManager
extends ServiceManager

A StatisticsManager is responsible for replicating the functionality of the gstat command-line tool. This functionality includes:

• Retrieving data table statistics
• Retrieving the database header page
• Retrieving index statistics
• Retrieving database logging information
• Retrieving statistics for the data dictionary

Author:

Gabriel Reid

Field Summary

Fields

Modifier and Type	Field and Description
static int	DATA_TABLE_STATISTICS Request statistics on data tables.
static int	INDEX_STATISTICS Request statistics on indexes.
static int	RECORD_VERSION_STATISTICS Request statistics on record versions.
static int	SYSTEM_TABLE_STATISTICS Request statistics on system tables.

Method Summary

Modifier and Type	Method and Description
void	getDatabaseStatistics() Get the full database statistics information, excluding system table information.
void	getDatabaseStatistics(int options) Get specific database statistics.
void	getHeaderPage() Fetch the database statistics header page.
void	getTableStatistics(java.lang.String[] tableNames) Get the table statistics.

Methods inherited from interface org.firebirdsql.management.ServiceManager

getDatabase, getHost, getLogger, getPassword, getPort, getUser, setDatabase, setHost, setLogger, setPassword, setPort, setUser

Field Detail

DATA_TABLE_STATISTICS

static final int DATA_TABLE_STATISTICS

Request statistics on data tables.

See Also:

Constant Field Values

INDEX_STATISTICS

static final int INDEX_STATISTICS

Request statistics on indexes.

See Also:

Constant Field Values

SYSTEM_TABLE_STATISTICS

static final int SYSTEM_TABLE_STATISTICS

Request statistics on system tables.

See Also:

Constant Field Values

RECORD_VERSION_STATISTICS

static final int RECORD_VERSION_STATISTICS

Request statistics on record versions.

See Also:

Constant Field Values

Method Detail

getHeaderPage

void getHeaderPage()
            throws java.sql.SQLException

Fetch the database statistics header page. The header information is written to this StatisticsManager's logger.

Throws:

java.sql.SQLException - if a database access error occurs

getDatabaseStatistics

void getDatabaseStatistics()
                    throws java.sql.SQLException

Get the full database statistics information, excluding system table information. The statistics information is written to this StatisticsManager's logger.

The listed data includes:

• statistics header page
• log statistics
• index statistics
• data table statistics

Invoking this method is equivalent to the default behaviour of gstat on the command-line.

Throws:

java.sql.SQLException - if a database access error occurs

getDatabaseStatistics

void getDatabaseStatistics(int options)
                    throws java.sql.SQLException

Get specific database statistics. The statistics information is written to this StatisticsManager's logger. All invocations of this method will result in the header page and log data being output. The following options can be supplied as a bitmask:

• DATA_TABLE_STATISTICS
• SYSTEM_TABLE_STATISTICS
• INDEX_STATISTICS
• RECORD_VERSION_STATISTICS

If this method is invoked with 0 as the options value, only the header and log statistics will be output.

Parameters:

options - A bitmask combination of DATA_TABLE_STATISTICS, SYSTEM_TABLE_STATISTICS, INDEX_STATISTICS, or RECORD_VERSION_STATISTICS. Can also be 0, which is equivalent to calling method getDatabaseStatistics()

Throws:

java.sql.SQLException

getTableStatistics

void getTableStatistics(java.lang.String[] tableNames)
                 throws java.sql.SQLException

Get the table statistics. The statistics information is written to this StatisticsManager's logger.

The listed data includes:

• the primary pointer and index root page numbers
• number of data pages and their average fill
• fill distribution

Invoking this method is equivalent to the behaviour of gstat -t

on the command-line.

Parameters:

tableNames - array of table names to analyze.

Throws:

java.sql.SQLException - if something went wrong.

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