Greenplum 排序算法Distinct聚集 46 ● Motion的Receiver需要接收多个Sender的数据,虽然每个Sender的数据保证 有序,但Receiver端也需要保证数据全局有序。 Sorted Motion 1 4 7 8 2 3 6 9 1 4 2 3 Sender1 Sender2 Receiver1 47 ● 首先读取每个Sender的第一个元素,之后在Receiver端进行归并排序 Sorted0 码力 | 52 页 | 2.05 MB | 1 年前3
PostgreSQL 17beta1 A4 Documentationstandby server, which may lead to data loss. Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will actually make certain commands faster, because they do not servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The default is 10. The value 0 means replication is disabled. Abrupt disconnection of megabytes. This parameter can only be set in the postgresql.conf file or on the server command line. wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 3017 页 | 14.45 MB | 1 年前3
PostgreSQL 17beta1 US Documentationstandby server, which may lead to data loss. Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will ac- tually make certain commands faster, because they do servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The default is 10. The value 0 means replication is disabled. Abrupt disconnection of megabytes. This parameter can only be set in the postgresql.conf file or on the server command line. wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 3188 页 | 14.32 MB | 1 年前3
PostgreSQL 14.10 Documentationstandby server, which may lead to data loss. Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will ac- tually make certain commands faster, because they do servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The default is 10. The value 0 means replication is disabled. Abrupt disconnection of megabytes. This parameter can only be set in the postgresql.conf file or on the server command line. wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 3032 页 | 13.27 MB | 1 年前3
PostgreSQL 14.10 Documentationmay lead to data loss. 507 Performance Tips Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will actually make certain commands faster, because they do not servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The default is 10. The value 0 means replication is disabled. Abrupt disconnection of megabytes. This parameter can only be set in the postgresql.conf file or on the server command line. wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 2871 页 | 13.38 MB | 1 年前3
PostgreSQL 13.13 Documentationchanging these settings requires a server restart. Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will actually make certain commands faster, because they do not servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The default is 10. The value 0 means replication is disabled. Abrupt disconnection of megabytes. This parameter can only be set in the postgresql.conf file or on the server command line. wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 2782 页 | 13.00 MB | 1 年前3
PostgreSQL 13.14 Documentationchanging these settings requires a server restart. Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will ac- tually make certain commands faster, because they do servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The default is 10. The value 0 means replication is disabled. Abrupt disconnection of megabytes. This parameter can only be set in the postgresql.conf file or on the server command line. wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 2940 页 | 12.89 MB | 1 年前3
PostgreSQL 16.1 Documentationstandby server, which may lead to data loss. Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will ac- tually make certain commands faster, because they do servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The 666 Server Configuration default is 10. The value 0 means replication is disabled megabytes. This parameter can only be set in the postgresql.conf file or on the server command line. wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 3133 页 | 14.10 MB | 1 年前3
PostgreSQL 16.1 Documentationmay lead to data loss. 521 Performance Tips Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will actually make certain commands faster, because they do not servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The default is 10. The value 0 means replication is disabled. Abrupt disconnection of be set in the postgresql.conf file or on the server command line. 632 Server Configuration wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 2974 页 | 14.22 MB | 1 年前3
PostgreSQL 15.5 Documentationmay lead to data loss. 515 Performance Tips Aside from avoiding the time for the archiver or WAL sender to process the WAL data, doing this will actually make certain commands faster, because they do not servers or streaming base backup clients (i.e., the maximum number of simultaneously running WAL sender processes). The default is 10. The value 0 means replication is disabled. Abrupt disconnection of megabytes. This parameter can only be set in the postgresql.conf file or on the server command line. wal_sender_timeout (integer) Terminate replication connections that are inactive for longer than this amount0 码力 | 2910 页 | 13.60 MB | 1 年前3
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