Log record header

1. Log record general flag constants

      Redo always                                          0x0001
      Propagatable                                         0x0002
      Temp table                                           0x0004
      Table space rollforward undo                         0x0008
      Singular transaction (no commit/rollback)            0x0010
      Conditionally recoverable                            0x0080
      Table space rollforward at check constraint process  0x0100
      Runtime rollback                                     0x0200
      Pseudo compensation                                  0x0800

2. Log sequence number (LSN)

      A 64-bit identifier that determines the order of the operations
      that generated the log records. The LSN is an ever-increasing value.
      Each member writes to its own set of log files (a log stream),
      and the LSN within a single log stream is a unique number.
   
      db2LSN: { db2Uint64 lsnU64;
                        }

3. Transaction identifier (TID)

      A unique log record identifier representing the transaction.
   
      SQLU_TID: union { unsigned char  [6] ;
                        unsigned short [3] ;
                        }

4. Record ID (RID)

      A unique number identifying the position of a record.
      RID: Page number 	char [4];
      slot number 	char [2];

/******************************************************************************
** db2LRI data structure
** db2LRI data structure parameters
**
** lriType
** The type of LRI structure.  The following are the valid types:
**    - DB2READLOG_LRI_1 : part1 is the LFS and part2 is the LSN for
**                         the log record
**    - DB2READLOG_LRI_2 : part1 is the logStreamID and part2 is the LSO for
**                         the log record
** (See "Log record header" in Db2 documentation for the meaning of LFS, 
**  LSN, LSO.)
**    
** part1     
** Part 1 of the LRI structure.
**
** part2
** Part 2 of the LRI structure.
**
*******************************************************************************/
typedef SQL_STRUCTURE db2LRI
{
   db2Uint64       lriType;            /* LRI type                            */
   db2Uint64       part1;              /* Part 1 of the LRI structure         */
   db2Uint64       part2;              /* Part 2 of the LRI structure         */
} db2LRI;

/* db2LRI types                                                               */
#define DB2READLOG_LRI_1 1             /* LRI type 1                          */
#define DB2READLOG_LRI_2 2             /* LRI type 2                          */