Class D_DiagnosticUtil

java.lang.Object
org.apache.derby.impl.store.raw.data.D_DiagnosticUtil
public class D_DiagnosticUtil extends Object
This class provides some utility functions used to debug on disk structures of the store.

  • Constructor Details

    • D_DiagnosticUtil

      public D_DiagnosticUtil()
      No arg Constructor.

  • Method Details

    • getModuleFromDbName

      private static Object getModuleFromDbName(String db_name) throws StandardException
      Given a database name come up with a module.

      Parameters:
      db_name - name of the database.
      Returns:
      The store module associated with given database name.
      Throws:
      StandardException - Standard exception policy.

    • diag_conglomid_print

      public static String diag_conglomid_print(String db_name, long conglomid) throws StandardException
      Given a Database name and conglomid print out diagnostic info.

      Print diagnostic information about a particular conglomerate, can be called for either a btree or heap conglomerate. This routine prints out the string to "System.out"; "ij", depending on it's configuration, will only print out a fixed length (default 128 bytes), so having ij print the string can be a problem.

      Can be called from ij to find out info about conglomid 19 in database 'msgdb' by using the following syntax: maximumdisplaywidth 9000; CREATE FUNCTION D_CONGLOMID_PRINT(DBNAME VARCHAR(128), CONGLOMID INT) RETURNS VARCHAR(32000) RETURNS NULL ON NULL INPUT EXTERNAL NAME 'org.apache.derby.impl.store.raw.data.D_DiagnosticUtil.diag_conglomid_print' LANGUAGE JAVA PARAMETER STYLE JAVA; values D_CONGLOMID_PRINT('msgdb', 19); com.ibm.db2j.protocol.BasicServices.Diagnostic.T_Diagnosticable:: diag_conglomid_print('msgdb', 19); RESOLVE - An interface that takes a table name would be nice.

      Parameters:
      db_name - name of the database
      conglomid - conglomerate id of the conglomerate to debug
      Throws:
      StandardException - Standard exception policy.

    • diag_conglomid

      public static String diag_conglomid(String db_name, long conglomid) throws StandardException
      Given a Database name and conglomid, return diagnositic string.

      Return a string with diagnostic information about a particular conglomerate, can be called for any type of conglomerate (some types may not return any info though).

      Can be called from ij to find out info about conglomid 19 in database 'msgdb' by using the following syntax: values com.ibm.db2j.protocol.BasicServices.Diagnostic.T_Diagnosticable:: diag_conglomid('msgdb', 19); maximumdisplaywidth 9000; CREATE FUNCTION DIAG_CONGLOMID(DBNAME VARCHAR(128), CONGLOMID INT) RETURNS VARCHAR(32000) RETURNS NULL ON NULL INPUT EXTERNAL NAME 'org.apache.derby.impl.store.raw.data.D_DiagnosticUtil.diag_conglomid' LANGUAGE JAVA PARAMETER STYLE JAVA; values DIAG_CONGLOMID('msgdb', 19); com.ibm.db2j.protocol.BasicServices.Diagnostic.T_Diagnosticable:: diag_conglomid_print('msgdb', 19); RESOLVE - An interface that takes a table name would be nice.

      Parameters:
      db_name - name of the database
      conglomid - conglomerate id of the conglomerate to debug
      Throws:
      StandardException - Standard exception policy.

    • diag_dump_page

      public static void diag_dump_page(String db_name, long segmentid, long containerid, long pagenumber)
      Dump raw contents of a page.

      A utility routine that can be called from an ij session that will dump the raw contents of a page, in the raw store dump format.

      Parameters:
      db_name - name of the database
      segmentid - segmentid of the table (usually 0)
      containerid - containerid of the table (not conglomid)
      pagenumber - pagenumber of page to dump.

    • diag_containerid_to_conglomid

      public static long diag_containerid_to_conglomid(String db_name, long containerid) throws StandardException
      Given a Database name and conglomid, return container id.

      Return the containerid of a given conglomerate id.

      Can be called from ij to find out info about conglomid 19 in database 'msgdb' by using the following syntax: values com.ibm.db2j.protocol.BasicServices.Diagnostic.T_Diagnosticable). diag_containerid_to_conglomid('msgdb', 924300359390); RESOLVE - An interface that takes a table name would be nice.

      Parameters:
      db_name - name of the database
      containerid - container id of the conglomerate to look up
      Throws:
      StandardException - Standard exception policy.

    • diag_containerid_to_conglomid

      public static long diag_containerid_to_conglomid(Object module, long containerid)

    • diag_conglomid_to_containerid

      public static long diag_conglomid_to_containerid(String db_name, long conglomid) throws StandardException
      Given a Database name and containerid, return conglomerate id.

      Return the conglomerate id of a given conainer id.

      Can be called from ij to find out info about conglomid 19 in database 'msgdb' by using the following syntax: values com.ibm.db2j.protocol.BasicServices.Diagnostic.T_Diagnosticable). diag_conglomid_to_containerid('msgdb', 19); RESOLVE - An interface that takes a table name would be nice.

      Parameters:
      db_name - name of the database
      conglomid - conglomerate id of the conglomerate to debug
      Throws:
      StandardException - Standard exception policy.

    • diag_conglomid_to_containerid

      public static long diag_conglomid_to_containerid(Object module, long conglomid)

    • findServiceModule

      private static Object findServiceModule(Object serviceModule, String factoryInterface) throws StandardException
      Privileged startup. Must be private so that user code can't call this entry point.
      Throws:
      StandardException

    • getServiceModule

      private static Object getServiceModule(Object serviceModule, String factoryInterface)
      Privileged module lookup. Must be private so that user code can't call this entry point.

    • findService

      private static Object findService(String factoryInterface, String serviceName)
      Privileged service lookup. Must be private so that user code can't call this entry point.