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etTimestamp 。 java.sql.DatabaseMetaData java.sql.DatabaseMetaData是数据库对象定义接口。 表3 对java.sql.DatabaseMetaData的支持情况 方法名 返回值类型 支持JDBC 4 getTables(String
etTimestamp 。 java.sql.DatabaseMetaData java.sql.DatabaseMetaData是数据库对象定义接口。 表3 对java.sql.DatabaseMetaData的支持情况 方法名 返回值类型 支持JDBC 4 getTables(String
数据定义的一部分。定义表之前,需首先定义数据库和模式,本节将介绍如何利用Data Studio创建表。执行如下步骤在数据库中定义表: 在“对象浏览器”窗格中,右键单击“普通表”,选择“创建普通表”。 定义基本表信息,如表名称、表类型等。详情请参见提供基本信息。 定义列相关信息,如
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
ORC,SLRU,MEM_CTL,AUTOVAC,ANALYZE,CACHE,ADIO,SSL,GDS,TBLSPC,WLM,SPACE,OBS,EXECUTOR,VEC_EXECUTOR,STREAM,LLVM,OPT,OPT_REWRITE,OPT_JOIN,OPT_AGG,OPT_SUBPLAN
ORC,SLRU,MEM_CTL,AUTOVAC,ANALYZE,CACHE,ADIO,SSL,GDS,TBLSPC,WLM,SPACE,OBS,EXECUTOR,VEC_EXECUTOR,STREAM,LLVM,OPT,OPT_REWRITE,OPT_JOIN,OPT_AGG,OPT_SUBPLAN
在开启并行查询后,请保证系统CPU、内存、网络、I/O等资源充足,以达到良好效果。 为了避免用户设置不合理的过大值造成性能劣化,系统会计算出该DN可用最大CPU核数,并以此来作为query_dop的上限。如果用户设置query_dop超过4并且同时超过该上限,那么系统会重置query_dop为该上限值。
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak
and CLOUD_SDK_SK in the local environment ak = os.getenv("CLOUD_SDK_AK") sk = os.getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak