.
\nIn a previous post I used X$KCCAGF to get more information about reclaimable archived logs in FRA, because there is a bug in standby (not opened) databases where archivelog deletion policy is ignored. I explained that the view V$RECOVERY_AREA_USAGE has only aggregated information about space reclaimable without the details about which files are reclaimable or not. Here I’ll explain how I came to X$KCCAGF and I’ll give the query to get all the detailed information that is hidden behind V$RECOVERY_AREA_USAGE.
Here is what is exposed by V$RECOVERY_AREA_USAGE:
\nSQL> set linesize 200 pagesize 1000\nSQL> select * from v$recovery_area_usage;\n\nFILE_TYPE PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES\n----------------------- ------------------ ------------------------- ---------------\nCONTROL FILE .21 0 1\nREDO LOG 0 0 0\nARCHIVED LOG .44 .37 15\nBACKUP PIECE .37 0 1\nIMAGE COPY 0 0 0\nFLASHBACK LOG 0 0 0\nFOREIGN ARCHIVED LOG 0 0 0\nAUXILIARY DATAFILE COPY 0 0 0\n\n8 rows selected.\nand this is a good overview about space usage. But now I want to see which are those archived logs that are reclaimable and which are not. Because I want to compare with backups, standby shipping, retention, etc.
\nHere is the information that I want:
\nFILE_TYPE FILE_NAME BYTES REC COMPLETIO\n------------ ------------------------------------------------------------------- --- ---------\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_9_9v5cn1kv_.arc 81408 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_7_9v59wnsb_.arc 599552 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_4_9v57fdtn_.arc 10725376 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_8_9v5cd035_.arc 112640 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_11_9v5ffd57_.arc 2515968 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_12_9v5fqd0k_.arc 112640 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_13_9v5fz8z1_.arc 529408 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_14_9v5hgkqr_.arc 94208 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_5_9v598zsz_.arc 2663424 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_10_9v5cxtr4_.arc 312832 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_6_9v59lvv7_.arc 127488 YES 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_17_9v5jcds8_.arc 126464 NO 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_16_9v5j2968_.arc 634368 NO 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_15_9v5hrgtv_.arc 2430976 NO 01-JUL-14\nARCHIVED LOG /fra/demo/archivelog/2014_07_01/o1_mf_1_18_9v5kny3b_.arc 190976 NO 01-JUL-14\nBACKUP PIECE /fra/demo/backupset/2014_07_18/o1_mf_annnn_TAG20140718T... 17882624 NO 18-JUL-14\nCONTROL FILE /fra/demo/controlfile/o1_mf_9v506z2f_.ctl 10027008 NO\n\n17 rows selected.\nI’ll show the query to get that, at the end of this post. But I’m also going to show you how I came to the right query, using undocumented information. The first idea was to get the V$RECOVERY_AREA_USAGE definition and see if there is any ‘group by’ that we can get rid of. V$ views definition is exposed in V$FIXED_VIEW_DEFINITION:
\nSQL> select * from v$fixed_view_definition where view_name='V$RECOVERY_AREA_USAGE';\n\nVIEW_NAME\n------------------------------\nVIEW_DEFINITION\n--------------------------------------------------------------------------------\n CON_ID\n----------\nV$RECOVERY_AREA_USAGE\nselect fusg.file_type,\n decode(nvl2(ra.name, ra.space_limit, 0), 0, 0,\n round(nvl(fusg.space_used, 0)/ra.space_limit, 4) * 10\n0), decode(nvl2(ra.na\n...\n from v$archived_log,\n (select /*+ no_merge */ ceilasm from x$krasga\n) where is_recovery_dest_file = 'YES'\n and name is not null) al,\n 0\nbut this is not enough because the view definition is limited to 4000 characters and the query is much larger than that. Note that I’ve not reproduced all the 4000 characters here.
\nSQL> desc v$fixed_view_definition\n Name Null? Type\n ------------------ -------- ----------------\n VIEW_NAME VARCHAR2(30)\n VIEW_DEFINITION VARCHAR2(4000)\nSo how to get the whole query? The fixed view definition is hardcoded in the oracle code. So let’s try to get it from the oracle binary. I have the beginning and I will try to find the full line from that pattern:
\n$ strings $ORACLE_HOME/bin/oracle | grep \"select fusg.file_type,\"\nAnd bingo, I have the full query. Once again, I reproduce only the first and last lines:
\nselect fusg.file_type, decode(nvl2(ra.name, ra.space_limit, 0), 0, 0, \n...\nunion all select 'AUXILIARY DATAFILE COPY' file_type, sum(adc.file_size) space_used, sum(case when adc.purgable = 1 then adc.file_size else 0 end) space_reclaimable, count(*) number_of_files from (select case when ceilasm = 1 and adfcnam like '+%' then ceil(((adfcnblks*adfcbsz)+1)/1048576)*1048576 else adfcnblks*adfcbsz end file_size, adfcrecl purgable from x$kccadfc, (select /*+ no_merge */ ceilasm from x$krasga) where bitand(adfcflg, 1) = 1 and adfcnam is not null)adc)fusg\nHere we get the whole query in one line. Then I’ve just to put it in the SQLDeveloper formatter, replace the aggregate functions for PERCENT_SPACE_USED, PERCENT_SPACE_RECLAIMABLE and NUMBER_OF_FILES by the file name and size, and the ‘reclaimable’ flag. Here is the whole query I used to get the result above:
\nset linesize 200 pagesize 1000\ncolumn file_name format a100\nSELECT file_type,\n name file_name,\n space_used bytes,\n CASE\n WHEN space_reclaimable>=space_used\n THEN 'YES'\n ELSE 'NO'\n END reclaimable,\n completion_time\nFROM\n (SELECT 'CONTROL FILE' file_type,\n name,\n CAST(NULL AS DATE) completion_time,\n (\n CASE\n WHEN ceilasm = 1\n AND name LIKE '+%'\n THEN ceil(((block_size*file_size_blks)+1)/1048576)*1048576\n ELSE block_size *file_size_blks\n END) space_used,\n 0 space_reclaimable,\n 1 number_of_files\n FROM v$controlfile,\n (SELECT /*+ no_merge */\n ceilasm FROM x$krasga\n )\n WHERE is_recovery_dest_file = 'YES'\n UNION ALL\n SELECT 'REDO LOG' file_type,\n member,\n CAST(NULL AS DATE),\n (\n CASE\n WHEN ceilasm = 1\n AND member LIKE '+%'\n THEN ceil((l.bytes+1)/1048576)*1048576\n ELSE l.bytes\n END) space_used,\n 0 space_reclaimable,\n 1 number_of_files\n FROM\n (SELECT group#, bytes FROM v$log\n UNION\n SELECT group#, bytes FROM v$standby_log\n ) l,\n v$logfile lf,\n (SELECT /*+ no_merge */\n ceilasm FROM x$krasga\n )\n WHERE l.group# = lf.group#\n AND lf.is_recovery_dest_file = 'YES'\n UNION ALL\n SELECT 'ARCHIVED LOG' file_type,\n name,\n completion_time,\n (al.file_size) space_used,\n (\n CASE\n WHEN dl.rectype = 11\n THEN al.file_size\n ELSE 0\n END) space_reclaimable,\n 1 number_of_files\n FROM\n (SELECT recid,\n name,\n completion_time,\n CASE\n WHEN ceilasm = 1\n AND name LIKE '+%'\n THEN ceil(((blocks*block_size)+1)/1048576)*1048576\n ELSE blocks * block_size\n END file_size\n FROM v$archived_log,\n (SELECT /*+ no_merge */\n ceilasm FROM x$krasga\n )\n WHERE is_recovery_dest_file = 'YES'\n AND name IS NOT NULL\n ) al,\n x$kccagf dl\n WHERE al.recid = dl.recid(+)\n AND dl.rectype(+) = 11\n UNION ALL\n SELECT 'BACKUP PIECE' file_type,\n handle,\n completion_time,\n (bp.file_size) space_used,\n (\n CASE\n WHEN dl.rectype = 13\n THEN bp.file_size\n ELSE 0\n END) space_reclaimable,\n 1 number_of_files\n FROM\n (SELECT recid,\n handle,\n completion_time,\n CASE\n WHEN ceilasm = 1\n AND handle LIKE '+%'\n THEN ceil((bytes+1)/1048576)*1048576\n ELSE bytes\n END file_size\n FROM v$backup_piece,\n (SELECT /*+ no_merge */\n ceilasm FROM x$krasga\n )\n WHERE is_recovery_dest_file = 'YES'\n AND handle IS NOT NULL\n ) bp,\n x$kccagf dl\n WHERE bp.recid = dl.recid(+)\n AND dl.rectype(+) = 13\n UNION ALL\n SELECT 'IMAGE COPY' file_type,\n name,\n completion_time,\n (dc.file_size) space_used,\n (\n CASE\n WHEN dl.rectype = 16\n THEN dc.file_size\n ELSE 0\n END) space_reclaimable,\n 1 number_of_files\n FROM\n (SELECT recid,\n name,\n completion_time,\n CASE\n WHEN ceilasm = 1\n AND name LIKE '+%'\n THEN ceil(((blocks*block_size)+1)/1048576)*1048576\n ELSE blocks * block_size\n END file_size\n FROM v$datafile_copy,\n (SELECT /*+ no_merge */\n ceilasm FROM x$krasga\n )\n WHERE is_recovery_dest_file = 'YES'\n AND name IS NOT NULL\n ) dc,\n x$kccagf dl\n WHERE dc.recid = dl.recid(+)\n AND dl.rectype(+) = 16\n UNION ALL\n SELECT 'FLASHBACK LOG' file_type,\n name,\n first_time,\n NVL(fl.space_used, 0) space_used,\n NVL(fb.reclsiz, 0) space_reclaimable,\n NVL(fl.number_of_files, 0) number_of_files\n FROM\n (SELECT name,\n first_time,\n (\n CASE\n WHEN ceilasm = 1\n AND name LIKE '+%'\n THEN ceil((fl.bytes+1)/1048576)*1048576\n ELSE bytes\n END)space_used,\n 1 number_of_files\n FROM v$flashback_database_logfile fl,\n (SELECT /*+ no_merge */\n ceilasm FROM x$krasga\n )\n ) fl,\n (SELECT SUM(to_number(fblogreclsiz)) reclsiz FROM x$krfblog\n )fb\n UNION ALL\n SELECT 'FOREIGN ARCHIVED LOG' file_type,\n rlnam,\n CAST(NULL AS DATE),\n (rlr.file_size) space_used,\n (\n CASE\n WHEN rlr.purgable = 1\n THEN rlr.file_size\n ELSE 0\n END) space_reclaimable,\n 1 number_of_files\n FROM\n (SELECT rlnam,\n CASE\n WHEN ceilasm = 1\n AND rlnam LIKE '+%'\n THEN ceil(((rlbct*rlbsz)+1)/1048576)*1048576\n ELSE rlbct *rlbsz\n END file_size,\n CASE\n WHEN bitand(rlfl2, 4096) = 4096\n THEN 1\n WHEN bitand(rlfl2, 8192) = 8192\n THEN 1\n ELSE 0\n END purgable\n FROM x$kccrl,\n (SELECT /*+ no_merge */\n ceilasm FROM x$krasga\n )\n WHERE bitand(rlfl2, 64) = 64\n AND rlnam IS NOT NULL\n )rlr\n UNION ALL\n SELECT 'AUXILIARY DATAFILE COPY' file_type,\n adfcnam,\n CAST(NULL AS DATE),\n (adc.file_size) space_used,\n (\n CASE\n WHEN adc.purgable = 1\n THEN adc.file_size\n ELSE 0\n END) space_reclaimable,\n 1 number_of_files\n FROM\n (SELECT adfcnam,\n CASE\n WHEN ceilasm = 1\n AND adfcnam LIKE '+%'\n THEN ceil(((adfcnblks*adfcbsz)+1)/1048576)*1048576\n ELSE adfcnblks *adfcbsz\n END file_size,\n adfcrecl purgable\n FROM x$kccadfc,\n (SELECT /*+ no_merge */\n ceilasm FROM x$krasga\n )\n WHERE bitand(adfcflg, 1) = 1\n AND adfcnam IS NOT NULL\n )adc\n )fusg\nORDER BY completion_time nulls last;\nDon’t hesitate to add more information as I did when investigating the archivelog deletion policy.
\n", "protected": false } }