Enable change tracking at the database and table level on the source server. Migrate the source database with initial full load using AWS DMS to the target. Create a linked server at the target to the source SQL Server. Create an anchor table at the target...
logstack | text | | extended |Type: readableEncoding:UTF8Formattype: csvFormatoptions: delimiter','null''escape'"'quote'"'Command: cat$GP_SEG_DATADIR/pg_log/*.csvExecuteon: all segments postgres=# \d+ gp_toolkit.__gp_log_master_extExternaltable"gp_toolkit.__gp_log_master_ext"Column|...
syncing data to disk ... ok initdb: warning: enabling "trust" authentication for local connections You can change this by editing pg_hba.conf or using the option -A, or --auth-local and --auth-host, the next time you run initdb. Success. You can now start the database server using:...
Replication delay can influence the timeliness of data on standby servers, potentially affecting read scalability and failover operations. To control replication delay, tracking delay indicators using resources like pg_stat_replication is critical. Implement strategies such as using faster hardware, optimizi...
alter database enable block change tracking using file '/u01/app/Oracle/admin/devdb/bdump/luke.log'; desc v$block_change_tracking; --RMAN 动态视图 V$ARCHIVED_LOG 显示在数据库中已经创建、备份或清除的归档文件。 V$BACKUP_CORRUPTION 显示在备份集的备份过程中找到的损坏块。
We will now discuss some more advanced features of SQL that simplify management and prevent loss or corruption of your data. Finally, we will look at some PostgreSQL™ extensions. This chapter will on occasion refer to examples found in Chapter 2, The SQL Language to change or improve them...
WAL buffer 由XLogCtlData结构中的三个字段维护,其大小受wal_buffers参数控制: /** Total shared-memory state for XLOG.*/typedefstructXLogCtlData{/* ... *//** These values do not change after startup, although the pointed-to pages* and xlblocks values certainly do. xlblocks values are protec...
PostgreSQL数据库头胎——后台一等公民进程StartupDataBase StartupXLOG函数初始化 ## StartupXLOG函数流程 第一步从checkpoint xlog记录中提取信息,更新共享内存变量,比如nextFullXid、nextOid、oidCount。 LastRec=RecPtr=checkPointLoc;/* initialize shared memory variables from the checkpoint record */Shmem...
/* * BufferDesc -- shared descriptor/state data for a single shared buffer. * * Note: Buffer header lock (BM_LOCKED flag) must be held to examine or change 【加BM_LOCKED(Buffer header lock)锁才能读写tag、state、wait_backend_pid】 * the tag, state or wait_backend_pid fields. In gen...
如果有记录返回,表示有处于change tracking的segment。事件级别:warning。重要程度:重要监控频率:5-10分钟。处理方法:1、检查DOWN segment主机是否正常。2、检查DOWN segment的primary, mirror节点的pg_log日志。找出原因。3、如果没有异常,使用gprecoverseg把DOWN的节点拉起来。