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 2-1 illustrates the format of the origin queue ID for Mirror Replication Agent for Oracle.
Character |
Bytes |
Description |
|---|---|---|
0-3 |
2 |
Database generation ID |
4-15 |
6 |
System change number |
16-19 |
2 |
Redo log thread |
20-23 |
2 |
System change number subindex |
24-43 |
10 |
Redo log record block address |
44-55 |
6 |
System change number of the oldest active transaction begin |
56-63 |
4 |
Locator ID |
