Format of origin queue ID

Each record in the transaction log is identified by an origin queue ID that consists of 64 hexadecimal characters (32 bytes). The format of the origin queue ID is determined by the Mirror Replication Agent instance, and it varies according to the primary database type.

Table 1-1 illustrates the format of the origin queue ID for the Mirror Replication Agent for Microsoft SQL Server.

**Table 1-1: Mirror Replication Agent for Microsoft SQL Server origin queue ID**
Character	Bytes	Description
0-3	2	Database generation ID
4-11	4	Virtual file sequence number
12-19	4	Page start offset
20-23	2	Operation number
24-31	4	Available for specifying uniqueness
32-39	4	Oldest active transaction: virtual file sequence number
40-47	4	Oldest active transaction: page start offset
48-51	2	Oldest active transaction: operation number
52-59	4	Latest committed transaction: page start offset
60-63	2	Latest committed transaction: operation number