How long does your Oracle RMAN backup take to complete? How does this vary over time? Are there patterns by week, week of month, or day of week?
The gist below can help you evaluate questions like these. If you’re interested in using R with Oracle more generally, check out this previous post on connecting R to an Oracle database with RJDBC.
Oracle RMAN backup duration
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| # Load rJava library | |
| Sys.setenv(JAVA_HOME='C:\\Program Files (x86)\\Java\\jre7\\') | |
| options(java.parameters="-Xmx1g") | |
| library(rJava) | |
| # Output Java version | |
| .jinit() | |
| print(.jcall("java/lang/System", "S", "getProperty", "java.version")) | |
| # Load RJDBC library | |
| library(RJDBC) | |
| # Create connection driver and open connection | |
| jdbcDriver <- JDBC(driverClass="oracle.jdbc.OracleDriver", classPath="lib/ojdbc6.jar") | |
| dbHostname <- 'database.company.com' | |
| dbPort <- 1521 | |
| dbService <- 'service.database.company.com' | |
| dbUser <- 'scott' | |
| dbPassword <- 'tiger' | |
| jdbcConnection <- dbConnect(jdbcDriver, sprintf('jdbc:oracle:thin:@//%s:%d/%s', dbHostname, dbPort, dbService), dbUser, dbPassword) | |
| # Query on the Oracle instance name. | |
| backupJobDetails <- dbGetQuery(jdbcConnection, "SELECT start_time, end_time, input_type, input_bytes_per_sec, output_bytes_per_sec, output_bytes FROM v$rman_backup_job_details ORDER BY start_time ASC") | |
| backupJobDetails$OUTPUT_BYTES_PER_SEC[which(is.na(backupJobDetails$OUTPUT_BYTES))] <- 0 | |
| backupJobDetails$INPUT_BYTES_PER_SEC[which(is.na(backupJobDetails$INPUT_BYTES))] <- 0 | |
| backupJobDetails$START_TIME <- as.POSIXct(backupJobDetails$START_TIME, tz="UTC") | |
| backupJobDetails$END_TIME <- as.POSIXct(backupJobDetails$END_TIME, tz="UTC") | |
| # Close connection | |
| dbDisconnect(jdbcConnection) | |
| # Now plot the details. | |
| library(ggplot2) | |
| library(scales) | |
| ggplot(backupJobDetails) + | |
| geom_point(aes(x=START_TIME, y=as.numeric(END_TIME - START_TIME)/60./60., color=factor(INPUT_TYPE))) + | |
| scale_x_datetime("Start Time", breaks = date_breaks("5 days")) + | |
| scale_y_continuous("Backup duration (hours)") + | |
| ggtitle('Oracle RMAN backup duration') |
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