JetResizeDatabase Function

Applies to: Windows | Windows Server

The JetResizeDatabase function extends or shrinks the size of a database that is currently open.

The JetResizeDatabase function was introduced in the Windows 8 operating system.

JET_ERR JET_API JetResizeDatabase(
  __in          JET_SESID sesid,
  __in          JET_DBID dbid,
  __in          unsigned long cpg,
  __out         unsigned long* pcpgActual,
  __in          const JET_GRBIT grbit
);

Parameters

sesid

The database session context to use for the API call.

dbid

The database that will be extended.

cpg

The requested size of the database, in pages.

pcpgActual

A pointer to a number that receives the size of the database, in pages, after the API call. If the API call fails, the contents of pcpgActual parameter are undefined.

grbit

A group of bits that specifies zero or more of the values listed in the following table.

Value	Meaning
JET_bitResizeDatabaseOnlyGrow	Only grow the database. If the resize call would shrink the database, do nothing.

Return value

This function returns the JET_ERR datatype with one of the return codes listed in the following table. For more information about the possible Extensible Storage Engine (ESE) errors, see Extensible Storage Engine Errors and Error Handling Parameters.

Return code	Description
JET_errSuccess	The operation completed successfully.
JET_errDiskFull	There is insufficient free space on the volume to perform the grow operation.
JET_errDiskIO	A file-related error was returned by the JetSetDatabaseSize function. For more information about other file-related errors that might be returned, see JetSetDatabaseSize.

Remarks

If the JetResizeDatabase function is called prior to inserting large amounts of data, the database file will be grown in one operation. This will reduce the likelihood of the database file becoming fragmented at the file system level, and also reduce the number of times the database file has to be grown. Growing the database file once can be faster than growing it several times.

To set the size of a database that is not opened, see JetSetDatabaseSize.

The file size might not match the number of pages that are returned in the pcpgReal parameter. Two additional reserved pages might not be counted in the pcpgReal parameter.

Requirements

Requirement	Value
Client	Requires Windows 8.
Server	Requires Windows Server 2012.
Header	Declared in Esent.h.
Library	Use ESENT.lib.
DLL	Requires ESENT.dll.

See also

JET_ERR
JET_GRBIT
JET_SESID
JET_TABLEID
JET_OBJECTINFO
JET_OBJECTLIST
JetSetDatabaseSize