"Oracle数据快照是数据库管理系统Oracle中的一种特性,用于创建和维护一个数据库表的静态副本,这个副本被称为物质化视图(Materialized View)。数据快照可以提供最新的、定期更新的数据集,通常用于数据仓库、报表或者远程数据同步等场景。在给定的文件中,我们看到一系列的CREATE MATERIALIZED VIEW LOG语句,这是设置物质化视图日志的过程,它是实现数据快照的关键步骤。 Oracle数据快照的工作原理: 1. 物质化视图日志(Materialized View Log):在源表上创建物质化视图日志,记录所有被修改的行的主键和新值。这一步骤在文件中的多个CREATE MATERIALIZED VIEW LOG语句中体现,例如CREATE MATERIALIZED VIEW LOG ON param_city WITH PRIMARY KEY INCLUDING NEW VALUES。这表示在param_city表上创建了一个物质化视图日志,包含主键,并且会记录新插入的值。 2. 物质化视图(Materialized View):创建物质化视图,它是一个实际的数据库表,其内容是从源表或查询中复制的。物质化视图可以是快照,即实时或定时更新的,也可以是只读的。 3. 快速刷新与完整刷新:Oracle提供了两种刷新机制。快速刷新利用物质化视图日志,仅更新自上次刷新以来发生变化的行,而完整刷新则重新计算整个视图。 4. 数据同步:通过DBLink或调度任务,可以定期或在特定事件触发时更新物质化视图,保持与源表的一致性。 在给定的文件中,我们看到了针对多个表创建物质化视图日志的命令,如param_city, param_codes, param_datastate等,这表明这些表可能需要被同步到其他地方,或者用于生成定期更新的报表。 使用Oracle数据快照的优势: - 提高性能:对于复杂的查询,物质化视图可以预先计算结果,从而减少查询时间。 - 数据分发:数据快照可以帮助在远程数据库间进行数据分发,尤其适用于广域网环境,减少网络传输的负担。 - 数据隔离:物质化视图可以提供一个独立的数据集,即使源表正在被修改,也不影响视图的查询。 然而,需要注意的是,数据快照需要额外的存储空间,并且需要管理刷新策略以确保数据一致性。此外,如果源表频繁更新,快速刷新可能仍然需要消耗一定的系统资源。 总结来说,Oracle数据快照是一种强大的工具,用于实现数据的即时或定时复制,优化查询性能,以及支持分布式数据管理。在实际应用中,应根据业务需求和系统资源来合理设计和使用数据快照。"
CREATE MATERIALIZED VIEW LOG ON param_city WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON param_codes WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON param_datastate WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON param_kjconfig WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON param_kjinfo WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON param_logup WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON param_sensorcode WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON param_sensortype WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON param_stationstate WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_aircompressor WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_cadevice WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_ch WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_changedata WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_corporationinfo WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_detailsinfo WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_equipment WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_esupply WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_fan WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_file WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_firedustdefense WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_gzm WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_handle WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_handlehistory WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_material WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_measure WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_methanecut WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_methanesensor WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_minesituation WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_person WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_secapparatus WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_selfassessment WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_uploadmap WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_upwinch WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_waterpump WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON mkxx_windduct WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_history WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_historydetail WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_material WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_materialconfig WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_person WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_resource WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_mgroup WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_mperson WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_mresource WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_mgp_r WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_yg_r WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_yr_r WITH PRIMARY KEY INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON ya_info WITH PRIMARY KEY INCLUDING NEW VALUES;
--------------------------------------------------
--地市数据库
--conn FJMJ/FJMJ@LYMJ;
-- Drop existing database link
--drop public database link FJMJ.ORCL.COM.CN;
-- Create database link
--create public database link FJMJ.ORCL.COM.CN
-- connect to FJMJ
-- using '(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=10.11.1.11)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=orcl)))';
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