137 lines
4.4 KiB
Bash
137 lines
4.4 KiB
Bash
#!/bin/bash
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# ==============================================================================
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# SAP HANA Backup Script
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#
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# Performs schema exports and/or tenant backups for a SAP HANA database.
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# Designed to be executed via a cronjob.
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# Reads all settings from the backup.conf file in the same directory.
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# ==============================================================================
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# --- Configuration and Setup ---
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# Find the script's own directory to locate the config file
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SCRIPT_DIR=$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" &> /dev/null && pwd)
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CONFIG_FILE="${SCRIPT_DIR}/backup.conf"
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# Check for config file and source it
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if [[ -f "$CONFIG_FILE" ]]; then
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source "$CONFIG_FILE"
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else
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echo "❌ Error: Configuration file not found at '${CONFIG_FILE}'"
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exit 1
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fi
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# Check if hdbsql executable exists
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if [[ ! -x "$HDBSQL_PATH" ]]; then
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echo "❌ Error: hdbsql not found or not executable at '${HDBSQL_PATH}'"
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exit 1
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fi
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# Calculate threads to use (half of the available cores, but at least 1)
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TOTAL_THREADS=$(nproc --all)
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THREADS=$((TOTAL_THREADS / 2))
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if [[ "$THREADS" -eq 0 ]]; then
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THREADS=1
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fi
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# --- Functions ---
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# Performs a binary export of a specific schema and compresses it.
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perform_schema_export() {
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echo "⬇️ Starting schema export for '${SCHEMA_NAME}'..."
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local timestamp
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timestamp=$(date +%Y%m%d_%H%M%S)
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local export_dir="${BACKUP_BASE_DIR}/schema"
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local export_path="${export_dir}/${SCHEMA_NAME}_${timestamp}"
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local archive_file="${export_path}.tar.gz"
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# Create the target directory if it doesn't exist
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mkdir -p "$export_dir"
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# Construct and execute the EXPORT query
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local query="EXPORT \"${SCHEMA_NAME}\".\"*\" AS BINARY INTO '${export_path}' WITH REPLACE THREADS ${THREADS};"
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# We redirect stdout and stderr to /dev/null for cleaner cron logs.
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# Remove "> /dev/null 2>&1" if you need to debug connection issues.
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"$HDBSQL_PATH" -U "$USER_KEY" "$query" > /dev/null 2>&1
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local exit_code=$?
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if [[ "$exit_code" -eq 0 ]]; then
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echo " ✅ Successfully exported schema '${SCHEMA_NAME}'."
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# Compress the exported directory
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echo " 🗜️ Compressing exported files..."
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tar -czf "$archive_file" -C "$export_dir" "$(basename "$export_path")"
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local tar_exit_code=$?
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if [[ "$tar_exit_code" -eq 0 ]]; then
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echo " ✅ Successfully created archive '${archive_file}'."
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echo " 🧹 Cleaning up temporary directory..."
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rm -rf "$export_path"
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echo " ✨ Cleanup complete."
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else
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echo " ❌ Error: Failed to compress '${export_path}'."
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fi
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else
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echo " ❌ Error: Failed to export schema '${SCHEMA_NAME}' (hdbsql exit code: ${exit_code})."
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fi
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}
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# Performs a full backup of the tenant database.
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perform_tenant_backup() {
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echo "⬇️ Starting tenant backup..."
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local timestamp
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timestamp=$(date +%Y%m%d_%H%M%S)
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local backup_dir="${BACKUP_BASE_DIR}/tenant"
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# HANA will create the final file; we just provide the location and prefix.
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local backup_path_prefix="${backup_dir}/backup_${timestamp}"
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# Create the target directory if it doesn't exist
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mkdir -p "$backup_dir"
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# The USER_KEY must be configured to connect to the desired tenant database.
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local query="BACKUP DATA USING FILE ('${backup_path_prefix}')"
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# We redirect stdout and stderr to /dev/null for cleaner cron logs.
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# Remove "> /dev/null 2>&1" if you need to debug connection issues.
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"$HDBSQL_PATH" -U "$USER_KEY" "$query" > /dev/null 2>&1
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local exit_code=$?
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if [[ "$exit_code" -eq 0 ]]; then
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echo " ✅ Successfully initiated tenant backup with prefix '${backup_path_prefix}'."
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else
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echo " ❌ Error: Failed to initiate tenant backup (hdbsql exit code: ${exit_code})."
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fi
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}
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# --- Main Execution ---
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echo "⚙️ Starting HANA backup process..."
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# Ensure the base directory exists
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mkdir -p "$BACKUP_BASE_DIR"
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case "$BACKUP_TYPE" in
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schema)
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perform_schema_export
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;;
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tenant)
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perform_tenant_backup
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;;
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all)
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perform_schema_export
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echo "" # Add a newline for better readability
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perform_tenant_backup
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;;
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*)
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echo " ❌ Error: Invalid BACKUP_TYPE '${BACKUP_TYPE}' in config. Use 'schema', 'tenant', or 'all'."
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;;
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esac
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echo "📦 Backup process complete."
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echo "👋 Exiting."
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