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Do vacuum freeze before copying data

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This commit is contained in:
Konstantin Knizhnik
2023-07-05 22:17:06 +03:00
parent 1389927d36
commit 68488f5c74
1 changed files with 7 additions and 0 deletions
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7
pgxn/neon/neon.c
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@@ -263,6 +263,7 @@ copy_from(PG_FUNCTION_ARGS)
char const* declare_cursor = "declare copy_data_cursor no scroll cursor for select * from copydata() as raw_page(relid text, fork text, blkno integer, content bytea)";
char* fetch_cursor = psprintf("fetch forward %d copy_data_cursor", COPY_FETCH_COUNT);
char const* close_cursor = "close copy_data_cursor";
char const* vacuum_freeze = "vacuum freeze";
char *content;
char const* relname;
BlockNumber blkno;
@@ -294,6 +295,12 @@ copy_from(PG_FUNCTION_ARGS)
report_error(ERROR, res, conn, true, CREATE_COPYDATA_FUNC);
PQclear(res);
/* Freeze all tables to prevent problems with XID mapping */
res = PQexec(conn, vacuum_freeze);
if (res == NULL || PQresultStatus(res) != PGRES_COMMAND_OK)
report_error(ERROR, res, conn, true, vacuum_freeze);
PQclear(res);
/* Start transaction to use cursor */
res = PQexec(conn, "BEGIN");
if (res == NULL || PQresultStatus(res) != PGRES_COMMAND_OK)