Picture Perfect 4.6 Enterprise Edition User Manual - UTCFS Global ...

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54Picture Perfect 4.6 Enterprise EditionUser ManualThe syscdr database is added to the installation. This database resides in the entrepdbs DB spaceand is required by the ER technology to administer the replication in every participant server.The table currseq (server_id int, table_name varchar(64), currseq int) is added to the installation.This table is populated with default records that have the server_name of that server, records foreach of the global tables that will have sequences (excluding history tables), and the value of currseqset to 0 or max(id) if there are records already on that host for that table.The table host_time (id int, hostname varchar(64), utc_timestamp date_time) is added duringnetlan/subhost installation. This table is populated with the current UTC time on each server for itself.The subhost records are replicated to the nethost. So, the host_time table on the subhost has one(1) record, and on the nethost the host_time table has a record for itself and records for all subhosts.The directories /ats (Aborted Transaction Spooling) and /ris (Row Information Spooling) arerequired by the table replicate definition which maintains log data about failed replicated records.The /ats and /ris directories are created in the Picture Perfect /ppbackup directory that isdefined in the Parameters UI (system_config table).The /ppbackup directory must have reserved enough space to keep log data from the /ats and/ris directories in addition to the recommended 25 to 35 Gb (additional minimum suggested for ERis 5 GB).ER configures and manages all servers in the installation by group names to allow space for serveraliases, server names for encrypted database communication or disaster/recovery servers, as inbackup/secondary (High-Availability Data Replication (HDR) servers.In ER configuration, the nethost is referred to as “nethost_1”. The first subhost is referred to as“subhost_2”, the second as “subhost_3”, and so on. The suffix number of the nethost or subhostrefers to the “id” of the corresponding server in the host table in the database.Enterprise Replication scriptsWith the introduction of ER, several existing installation, database management and monitoringscripts/tools have been modified and new tools have been introduced.The following sections describe new and modified ER monitoring and management tools:• ercmd.sh• hostconfig• cdr_er_cleanup.sh
Chapter 4Managing your network database55ercmd.shHealth checks and other monitoring and management tasks that are specific to ER can be performedwith the command line function /cas/er/bin/ercmd.sh. The ercmd.sh script can be used to:• Get replication participating server information (list of servers)• Get table synchronization status• Get table replicating status• Manually re-synchronize table data• Manually re-synchronize data on a server• Extend the size of the ER database spaces when a new subhost is added to the configuration• Create a tar file with diagnostic information from all ER logs created on the system• Remove ER from the serverThe script can be run as root or ppadmin user.In addition, cronjobs, database tasks, and database issued events are used to monitor the ERsystem for:• ER database space at 90%• Server times being out of synch• Running out of sequences• ER errors (ATS/RIS files)• ER internal failureNote: Failed ER transactions are logged to files in the /ppbackup/ats and /ppbackup/ris directories.Table 5 lists the command options and arguments for ercmd.sh.Table 5.ercmd.sh optionsOptionDescription--list This option displays the names of the hosts participating in ER. See Chapter 5,Running ercmd.sh --list.--status [-b table_name]--createsupportfile--addchunks -d dbspace_name -n sizeThis option displays the replication status for replicated tables; optionally takesthe table_name argument to display the replication status for the specifiedtable.• When run on the nethost, shows the replication status for all tables on allhosts. See Chapter 5, Running ercmd.sh --status.• When run on a subhost, shows the replication status for itself and nethost.Note: The cdr_er_display_config.sh script can also be used to displaythe ER configuration and current state. This script displays 'cdr list server' datain a user-friendly manner with hostnames instead of group names (groupnames are not indicative of the host.)This option creates a tar file that contains ER diagnostic information forCustomer Support for troubleshooting purposes.The tar file is stored in /cas/log/pp_er_diag_data.tarThis option extends the ER database space. The addchunks option callscdr_er_ext_dbspace.sh to add new a new chunk (in MB) of databasespace for ER.
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