Greenplum分布式事务
'T' 命令
'T'命令是GPDB在PostgreSQL基础上新扩展的用于分布式事务的命令。
- snippet.cpp
void PostgresMain(int argc, char *argv[], const char *dbname, const char *username) { switch (firstchar) { case 'Q': /* simple query */ …… case 'M': /* MPP dispatched stmt from QD */ …… case 'T': /* MPP dispatched dtx protocol command from QD */ ……
构建即将分发给执行节点的命令
- snippet.cpp
/* * Build a dtx protocol command string to be dispatched to QE. */ static char * buildGpDtxProtocolCommand(DispatchCommandDtxProtocolParms *pDtxProtocolParms, int *finalLen) { …… *pos++ = 'T'; ……
打赏作者以资鼓励：
 |  |