{"id":855,"date":"2026-04-01T14:18:05","date_gmt":"2026-04-01T11:18:05","guid":{"rendered":"https:\/\/oraclius.com.tr\/?p=855"},"modified":"2026-04-01T14:18:06","modified_gmt":"2026-04-01T11:18:06","slug":"oracle-19c-en-onemli-50-wait-event","status":"publish","type":"post","link":"https:\/\/oraclius.com.tr\/en\/oracle-19c-en-onemli-50-wait-event\/","title":{"rendered":"ORACLE 19c \u2013 En \u00d6nemli 50 Wait Event"},"content":{"rendered":"

\ud83d\udcc0 I\/O (Disk) Event\u2019leri<\/h2>\n\n\n\n
    \n
  1. db file sequential read<\/strong> \u2192 Tek blok okuma (index access)<\/li>\n\n\n\n
  2. db file scattered read<\/strong> \u2192 \u00c7oklu blok okuma (full scan)<\/li>\n\n\n\n
  3. direct path read<\/strong> \u2192 PGA \u00fczerinden direkt okuma<\/li>\n\n\n\n
  4. direct path write<\/strong> \u2192 PGA \u00fczerinden direkt yazma<\/li>\n\n\n\n
  5. direct path read temp<\/strong> \u2192 Temp tablespace\u2019ten okuma<\/li>\n\n\n\n
  6. direct path write temp<\/strong> \u2192 Temp\u2019e yazma (sort\/hash)<\/li>\n\n\n\n
  7. log file parallel write<\/strong> \u2192 Redo log diske yaz\u0131l\u0131yor<\/li>\n\n\n\n
  8. log file single write<\/strong> \u2192 Tek redo write<\/li>\n\n\n\n
  9. control file sequential read<\/strong> \u2192 Control file tekli okuma<\/li>\n\n\n\n
  10. control file parallel write<\/strong> \u2192 Control file yazma<\/li>\n<\/ol>\n\n\n\n
    \n\n\n\n

    \ud83d\udcbe Commit \/ Redo<\/h2>\n\n\n\n
      \n
    1. log file sync<\/strong> \u2192 Commit bekliyor (\u00e7ok kritik)<\/li>\n\n\n\n
    2. log buffer space<\/strong> \u2192 Redo buffer dolu<\/li>\n\n\n\n
    3. log file switch (checkpoint incomplete)<\/strong> \u2192 Checkpoint yeti\u015fmedi<\/li>\n\n\n\n
    4. log file switch completion<\/strong> \u2192 Log switch bekleniyor<\/li>\n<\/ol>\n\n\n\n
      \n\n\n\n

      \ud83d\udd12 Concurrency (Lock & Latch)<\/h2>\n\n\n\n
        \n
      1. enq: TX – row lock contention<\/strong> \u2192 Sat\u0131r kilidi bekleme<\/li>\n\n\n\n
      2. enq: TM – contention<\/strong> \u2192 Tablo lock bekleme<\/li>\n\n\n\n
      3. latch: cache buffers chains<\/strong> \u2192 Hot block contention<\/li>\n\n\n\n
      4. latch free<\/strong> \u2192 Genel latch bekleme<\/li>\n\n\n\n
      5. buffer busy waits<\/strong> \u2192 Ayn\u0131 block\u2019a eri\u015fim \u00e7ak\u0131\u015fmas\u0131<\/li>\n\n\n\n
      6. read by other session<\/strong> \u2192 Ba\u015fkas\u0131 okuyor, sen bekliyorsun<\/li>\n\n\n\n
      7. gc buffer busy acquire<\/strong> \u2192 RAC block contention<\/li>\n\n\n\n
      8. gc buffer busy release<\/strong> \u2192 RAC block release bekleme<\/li>\n<\/ol>\n\n\n\n
        \n\n\n\n

        \ud83e\udde0 Library Cache \/ Parse<\/h2>\n\n\n\n
          \n
        1. library cache lock<\/strong> \u2192 Obje lock bekleme<\/li>\n\n\n\n
        2. library cache pin<\/strong> \u2192 Obje kullan\u0131m bekleme<\/li>\n\n\n\n
        3. cursor: pin S wait on X<\/strong> \u2192 Cursor contention<\/li>\n\n\n\n
        4. cursor: mutex S<\/strong> \u2192 Cursor mutex bekleme<\/li>\n\n\n\n
        5. cursor: mutex X<\/strong> \u2192 Cursor exclusive mutex<\/li>\n\n\n\n
        6. parse time cpu<\/strong> \u2192 Parse CPU yo\u011fun<\/li>\n\n\n\n
        7. hard parse elapsed time<\/strong> \u2192 Hard parse s\u00fcresi<\/li>\n<\/ol>\n\n\n\n
          \n\n\n\n

          \u2699\ufe0f Configuration \/ Memory<\/h2>\n\n\n\n
            \n
          1. free buffer waits<\/strong> \u2192 Bo\u015f buffer yok<\/li>\n\n\n\n
          2. checkpoint completed<\/strong> \u2192 Checkpoint bitmi\u015f bekleniyor<\/li>\n\n\n\n
          3. write complete waits<\/strong> \u2192 Yazma tamamlanmam\u0131\u015f<\/li>\n\n\n\n
          4. db file parallel write<\/strong> \u2192 DB writer yaz\u0131yor<\/li>\n\n\n\n
          5. DB CPU<\/strong> \u2192 CPU t\u00fcketimi (wait de\u011fil ama \u00f6nemli)<\/li>\n<\/ol>\n\n\n\n
            \n\n\n\n

            \ud83c\udf10 Network<\/h2>\n\n\n\n
              \n
            1. SQL*Net message from client<\/strong> \u2192 Client bekleniyor (idle)<\/li>\n\n\n\n
            2. SQL*Net message to client<\/strong> \u2192 Client\u2019a veri g\u00f6nderiliyor<\/li>\n\n\n\n
            3. SQL*Net more data from client<\/strong> \u2192 B\u00fcy\u00fck veri geliyor<\/li>\n\n\n\n
            4. SQL*Net more data to client<\/strong> \u2192 B\u00fcy\u00fck veri gidiyor<\/li>\n<\/ol>\n\n\n\n
              \n\n\n\n

              \ud83d\udcca Application<\/h2>\n\n\n\n
                \n
              1. enq: TX – index contention<\/strong> \u2192 Index blok contention<\/li>\n\n\n\n
              2. row cache lock<\/strong> \u2192 Data dictionary lock<\/li>\n\n\n\n
              3. row cache mutex<\/strong> \u2192 Dictionary mutex bekleme<\/li>\n\n\n\n
              4. resmgr: cpu quantum<\/strong> \u2192 Resource Manager CPU limiti<\/li>\n<\/ol>\n\n\n\n
                \n\n\n\n

                \ud83e\uddee Temp \/ Sort<\/h2>\n\n\n\n
                  \n
                1. sort segment request<\/strong> \u2192 Temp alan allocation<\/li>\n\n\n\n
                2. direct path write temp<\/strong> \u2192 Temp\u2019e yazma<\/li>\n\n\n\n
                3. direct path read temp<\/strong> \u2192 Temp\u2019ten okuma<\/li>\n<\/ol>\n\n\n\n
                  \n\n\n\n

                  \u26a1 RAC (Cluster ortam\u0131)<\/h2>\n\n\n\n
                    \n
                  1. gc cr request<\/strong> \u2192 RAC consistent read iste\u011fi<\/li>\n\n\n\n
                  2. gc current request<\/strong> \u2192 RAC current block iste\u011fi<\/li>\n\n\n\n
                  3. gc cr grant 2-way<\/strong> \u2192 RAC block transfer<\/li>\n\n\n\n
                  4. gc current grant 2-way<\/strong> \u2192 RAC current transfer<\/li>\n<\/ol>\n\n\n\n
                    \n\n\n\n

                    \ud83d\ude34 Idle (Genelde sorun de\u011fil)<\/h2>\n\n\n\n
                      \n
                    1. rdbms ipc message<\/strong> \u2192 Background process bekliyor<\/li>\n<\/ol>\n\n\n\n

                      <\/p>","protected":false},"excerpt":{"rendered":"

                      \ud83d\udcc0 I\/O (Disk) Event\u2019leri \ud83d\udcbe Commit \/ Redo \ud83d\udd12 Concurrency (Lock & Latch) \ud83e\udde0 Library Cache \/ Parse \u2699\ufe0f Configuration \/ Memory \ud83c\udf10 Network \ud83d\udcca Application \ud83e\uddee Temp \/ Sort \u26a1 RAC (Cluster ortam\u0131) \ud83d\ude34 Idle (Genelde sorun de\u011fil)<\/p>","protected":false},"author":1,"featured_media":55,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[161],"tags":[],"class_list":["post-855","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-useful-queries"],"_links":{"self":[{"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/posts\/855","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/comments?post=855"}],"version-history":[{"count":1,"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/posts\/855\/revisions"}],"predecessor-version":[{"id":856,"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/posts\/855\/revisions\/856"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/media\/55"}],"wp:attachment":[{"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/media?parent=855"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/categories?post=855"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oraclius.com.tr\/en\/wp-json\/wp\/v2\/tags?post=855"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}