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var expectedResults = []string{`{"data_file":{"id":18,"name":"/u02/app/oracle/oradata/ORCLCDB/orclpdb1/sysaux01.dbf","online_status":"ONLINE","size":{"bytes":9999990,"free":{"bytes":99999994},"max":{"bytes":9999994}},"status":"AVAILABLE"},"name":"SYSAUX","space":{"free":{"bytes":9999},"used":{"bytes":9991}}}`,
var expectedResults = []string{`{"data_file":{"id":18,"name":"/u02/app/oracle/oradata/ORCLCDB/orclpdb1/sysaux01.dbf","online_status":"ONLINE","size":{"bytes":9999990,"free":{"bytes":99999994},"max":{"bytes":9999994}},"status":"AVAILABLE"},"name":"SYSAUX","space":{"free":{"bytes":9999},"total":{"bytes":99999},"used":{"bytes":9991}}}`,
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rows, err := e.db.QueryContext(ctx, `WITH sums AS ( SELECT (SELECT SUM(BYTES) FROM DBA_DATA_FILES) + (SELECT SUM(BYTES) FROM DBA_TEMP_FILES) AS TOTAL_SUM FROM dual ) SELECT t.TABLESPACE_NAME, s.TOTAL_SUM, t.ALLOCATED_SPACE, t.FREE_SPACE FROM DBA_TEMP_FREE_SPACE t, sums s `)
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Can you consider something simple as below
SELECT
t.TABLESPACE_NAME,
(SELECT SUM(BYTES) FROM DBA_DATA_FILES) + (SELECT SUM(BYTES) FROM DBA_TEMP_FILES) AS TOTAL_SUM,
t.ALLOCATED_SPACE,
t.FREE_SPACE
FROM
DBA_TEMP_FREE_SPACE t;
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Talking about Niraj's query:
See this. (You are using cross join with CTE and DBA_TEMP_FREE_SPACE).
Now that I read more and more on this I keep on finding something new.
In the query below, the scalar subquery is used to get the TOTAL_SUM from sums CTE compared to your query where CTE is cross-joined with DBA_TEMP_FREE_SPACE. From what I read in most places, scalar subquery seems to be generally a better choice in terms of perf and readability. For example, As the same scalar subquery is running for each row, Oracle might as well cache it and keep using it. In the case of cross joins, it takes up a lot of memory to create a temp table to do the join (unless the DB optimizes it).
WITH sums AS (
SELECT (SELECT SUM(BYTES) FROM DBA_DATA_FILES) + (SELECT SUM(BYTES) FROM DBA_TEMP_FILES) AS TOTAL_SUM
FROM dual
)
SELECT t.TABLESPACE_NAME, (SELECT TOTAL_SUM FROM sums) AS TOTAL_SUM, t.ALLOCATED_SPACE, t.FREE_SPACE
FROM DBA_TEMP_FREE_SPACE t;
This query will calculate the total sum separately and display it as a single value for each row. No cross joins.
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func (e *tablespaceExtractor) usedAndFreeSpaceData(ctx context.Context) ([]usedAndFreeSpace, error) {
rows, err := e.db.QueryContext(ctx, "SELECT b.tablespace_name, tbs_size used, a.free_space freeFROM (SELECT tablespace_name, sum(bytes) AS free_space FROM dba_free_space GROUP BY tablespace_name) a, (SELECT tablespace_name, sum(bytes) AS tbs_size FROM dba_data_files GROUP BY tablespace_name) b WHERE a.tablespace_name(+)=b.tablespace_name")
rows, err := e.db.QueryContext(ctx, `SELECT b.tablespace_name, (b.tbs_size - a.free_space) used, a.free_space free, (SELECT SUM(bytes) FROM DBA_DATA_FILES) + (SELECT SUM(bytes) FROM DBA_TEMP_FILES) AS total_sum FROM (SELECT tablespace_name, SUM(bytes) AS free_space FROM DBA_FREE_SPACE GROUP BY tablespace_name) a RIGHT JOIN (SELECT tablespace_name, SUM(bytes) AS tbs_size FROM DBA_DATA_FILES GROUP BY tablespace_name) b ON a.tablespace_name = b.tablespace_name`)
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