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Blocks Read or Hit

  1. The tenth chart in the bottom section, shows the load on the PostgreSQL database system, in terms of number of data blocks read from the disk or from the cache by top 10 databases.
  2. The longer the horizontal bars and higher the number, the more the number of blocks read or hit.
  3. Hover over the bars for more information.
  4. If the number of blocks read is too high in a database, then the tables may not be properly indexed. Investigate further and resolve the issues.
  5. It also could indicate low system memory. If it is the case, address the issue by adding more memory to the system.
  6. Aim for more blocks to be read from the cache (hit) rather than from the disk.