服装批发做哪个网站好呢电商软文范例100字
由于数据库增量同步软件PanguSync初始化最大超时时间为600s,如果初始数据量很大，第一次部署时可能会超时，可以先停止任务，使用以下Sql语句进行初始化，以下语句可以分步执行，初始化完成后，后续无需再执行耗时的初始化。
Sqlserver
源操作：1.创建字段
alter table 表名 Add C_PanguSyncSourceTimestamp datetime2(6) not null default sysdatetime()2.设置初始化分批时间
WITH NumberedRows AS ( SELECT C_PanguSyncSourceTimestamp , ROW_NUMBER() OVER (ORDER BY [主键] desc) AS RowNum FROM 表名
)
UPDATE Nr
SET Nr.C_PanguSyncSourceTimestamp = DATEADD(MILLISECOND, -Nr.RowNum, SYSDATETIME())
FROM NumberedRows Nr;3.创建索引
CREATE INDEX I_PanguSyncSourceTimestamp on 表名(C_PanguSyncSourceTimestamp ) WITH (ONLINE = ON)
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目标操作：1.创建字段
alter table 表名 Add C_PanguSyncTargetTimestamp datetime2(6) not null default '2000-01-01 00:00:00.000000'2.设置初始化分批时间如果存在C_PanguSyncSourceTimestamp字段：WITH NumberedRows AS ( SELECT C_PanguSyncTargetTimestamp,C_PanguSyncSourceTimestamp ,ROW_NUMBER() OVER (ORDER BY (select NULL)) AS RowNum FROM 表名
)
UPDATE Nr
SET Nr.C_PanguSyncSourceTimestamp =Nr.C_PanguSyncSourceTimestamp ,Nr.C_PanguSyncTargetTimestamp = DATEADD(MILLISECOND, -Nr.RowNum, CAST('2000-01-01 00:00:00.000' AS DATETIME))
FROM NumberedRows Nr;如果不存在C_PanguSyncSourceTimestamp字段：WITH NumberedRows AS ( SELECT C_PanguSyncTargetTimestamp, ROW_NUMBER() OVER (ORDER BY (select NULL)) AS RowNum FROM 表名
)
UPDATE Nr
SET Nr.C_PanguSyncTargetTimestamp = DATEADD(MILLISECOND, -Nr.RowNum, CAST('2000-01-01 00:00:00.000' AS DATETIME))
FROM NumberedRows Nr;3.创建索引
CREATE INDEX I_PanguSyncTargetTimestamp on 表名(C_PanguSyncTargetTimestamp ) WITH (ONLINE = ON)Mysql
源操作：1.创建字段
alter table `源表` Add column `C_PanguSyncSourceTimestamp` timestamp(6) not null default current_timestamp(6) ON UPDATE CURRENT_TIMESTAMP(6);2.设置分批时间
SET @row_number = 0;
UPDATE `源表` SET C_PanguSyncSourceTimestamp = TIMESTAMPADD(MICROSECOND, -(@row_number:=@row_number + 1), CAST(current_timestamp(6) AS DATETIME(6)))3.创建索引
CREATE INDEX I_PanguSyncSourceTimestamp on `源表` (`C_PanguSyncSourceTimestamp`)
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目标操作：1.创建字段
alter table `目标表` Add column C_PanguSyncTargetTimestamp timestamp(6) NOT NULL DEFAULT '2000-01-01 00:00:00.000000'2.设置分批时间如果存在C_PanguSyncSourceTimestamp字段：SET @row_number = 0;
UPDATE `目标表` SET C_PanguSyncSourceTimestamp=C_PanguSyncSourceTimestamp,C_PanguSyncTargetTimestamp = TIMESTAMPADD(MICROSECOND, -(@row_number:=@row_number + 1), CAST('2000-01-01 00:00:00.000000' AS DATETIME(6)))如果不存在C_PanguSyncSourceTimestamp字段：SET @row_number = 0;
UPDATE `目标表` SET C_PanguSyncTargetTimestamp = TIMESTAMPADD(MICROSECOND, -(@row_number:=@row_number + 1), CAST('2000-01-01 00:00:00.000000' AS DATETIME(6)))3.创建索引
CREATE INDEX I_PanguSyncTargetTimestamp on `目标表` (`C_PanguSyncTargetTimestamp`)