Select /*+read_consistency(weak)*/ * from test where c1=1; 设置系统变量 Session 级别设置: set @@ob_read_consistency=2,其中1=FROZEN、2=WEAK、3=STRONG; 用户级别设置: set global ob_read_consistency=2; OceanBase 数据库维护了一个租户级别最大安全可读的版本号,弱读语句快照由该版本号决定。非 R...
obproxy_read_consistency 更新时间:2024-11-13 10:21:00 编辑 obproxy_read_consistency用于设置 SQL 请求的读一致性级别。 属性描述 参数类型整数类型 默认值0 取值范围 0:表示设置为强一致性读 1:表示设置为弱一致性读 是否重启 ODP 生效否 联系我们 AI助手...
obproxy_read_consistency 更新时间:2024-11-13 10:21:00 obproxy_read_consistency用于设置 SQL 请求的读一致性级别。 属性描述 参数类型整数类型 默认值0 取值范围 0:表示设置为强一致性读 1:表示设置为弱一致性读 是否重启 ODP 生效否 联系我们 AI助手...
下列哪些业务,适合将租户级别变量 ob_read_consistency 设置成 weak ?A.转账系统B.历史行情平台C.支付交易系统D.用户信息查询系统的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一键将文档转化为在线题库手机刷
ob_read_consistencyspecifies the read consistency level. AttributeDescription Typeenum Default valueSTRONG Value range 0: An empty string 1: FROZEN 2: WEAK 3: STRONG Applicable scope Global Session Involved in serialization?Yes Plan generation affected?Yes ...
Since the weak consistency of a read-only transaction improves concurrency in heterogeneous locking protocols, the users can help to improve concurrency in heterogeneous locking protocols by supplying the consistency requirements of read-only transactions. A heterogeneous locking protocol P' derived from a...
Data replication technologies in distributed storage systems introduce the problem of data consistency. For high performance, data replication systems often settle for weak consistency models, such as Pipelined-RAM consistency. To determine whether a data replication system provides Pipelined-RAM consistency...
In this paper we propose a protocol that makesa distinction between two classes of consistency: weak and strict, andtreats them differently. Strict consistency is used for data that needs tobe consistent all the time, whereas weak consistency is for cases whenstale data can be tolerated in the...
An important weak consistency is Pipelined-RAM (PRAM) consistency. It allows different processes to hold different views of data. To determine whether a data replication system indeed provides PRAM consistency, we study the problem of Verifying PRAM Consistency over read/write traces (or VPC, for ...
This paper aims at reducing the consistency maintenance work and proposes a protocol that distinguishes between two classes of consistency (i.e. weak and strong) and treats them differently. Strong consistency is used for data that needs to be consistent all the time, whereas weak consistency is...